Marine Weather and Tide Forecast for St. Simons, GA
April 22, 2025 2:03 AM EDT (06:03 UTC) Change Location
 | Sunrise 6:48 AM Sunset 8:00 PM Moonrise 2:35 AM Moonset 1:29 PM |
AMZ450 Coastal Waters From Altamaha Sound To Fernandina Beach Fl Out 20 Nm- Coastal Waters From Fernandina Beach To St. Augustine Fl Out 20 Nm- Coastal Waters From St. Augustine To Flagler Beach Fl Out 20 Nm- 857 Pm Edt Mon Apr 21 2025
Rest of tonight - Southeast winds 10 to 15 knots becoming south after midnight. Seas 3 to 4 feet, occasionally to 5 feet. Wave detail: southeast 3 feet at 4 seconds and southeast 3 feet at 8 seconds. Intracoastal waters a moderate chop.
Tuesday - Southeast winds 10 to 15 knots. Seas around 3 feet. Wave detail: southeast 3 feet at 8 seconds. Intracoastal waters a moderate chop.
Tuesday night - South winds 10 to 15 knots. Seas around 3 feet. Wave detail: southeast 3 feet at 4 seconds and east 3 feet at 8 seconds. Intracoastal waters a moderate chop.
Wednesday - Southeast winds 5 to 10 knots. Seas 2 to 3 feet. Wave detail: east 3 feet at 9 seconds and southeast 2 feet at 5 seconds. Intracoastal waters light chop.
Wednesday night through Thursday night - Southeast winds 5 to 10 knots. Seas 2 to 3 feet. Wave detail: east 3 feet at 9 seconds and southeast 2 feet at 4 seconds. Intracoastal waters light chop.
Friday - Southeast winds 5 to 10 knots. Seas 2 to 3 feet. Wave detail: east 3 feet at 9 seconds. Intracoastal waters light chop.
Saturday - South winds 5 to 10 knots. Seas around 3 feet. Intracoastal waters light chop. A slight chance of showers in the evening.
AMZ400 Synopsis For Altamaha Sound Ga To Flagler Beach Fl Out To 60 Nm- 857 Pm Edt Mon Apr 21 2025
Synopsis -
low seas and breezy south-southeasterly winds will continue through midweek, as high pressure remains over the western atlantic. The next frontal system will be possible this weekend as a backdoor front attempts to slide in from the northeast on Sunday.
Gulf stream -
the approximate location of the west wall of the gulf stream as of apr 19, 2025 at 1200 utc - .
71 nautical miles east of flagler beach. 80 nautical miles east of saint augustine beach. 89 nautical miles east of jacksonville beach. 94 nautical miles east of st simons island.
this data courtesy of the naval oceanographic office.
low seas and breezy south-southeasterly winds will continue through midweek, as high pressure remains over the western atlantic. The next frontal system will be possible this weekend as a backdoor front attempts to slide in from the northeast on Sunday.
the approximate location of the west wall of the gulf stream as of apr 19, 2025 at 1200 utc - .
71 nautical miles east of flagler beach. 80 nautical miles east of saint augustine beach. 89 nautical miles east of jacksonville beach. 94 nautical miles east of st simons island.
this data courtesy of the naval oceanographic office.
7 Day Forecast for Marine Location Near St. Simons, GA
NEW! Add second zone forecast
| St. Simons Light Click for Map Mon -- 02:55 AM EDT 6.39 feet High Tide Mon -- 02:58 AM EDT Moonrise Mon -- 06:50 AM EDT Sunrise Mon -- 09:34 AM EDT 1.18 feet Low Tide Mon -- 01:23 PM EDT Moonset Mon -- 03:26 PM EDT 5.86 feet High Tide Mon -- 07:58 PM EDT Sunset Mon -- 09:42 PM EDT 1.17 feet Low Tide Tide / Current data from XTide NOT FOR NAVIGATION |
St. Simons Light, Georgia, Tide feet
| 12 am |
| 4.4 |
| 1 am |
| 5.4 |
| 2 am |
| 6.2 |
| 3 am |
| 6.4 |
| 4 am |
| 6.1 |
| 5 am |
| 5.2 |
| 6 am |
| 4.1 |
| 7 am |
| 2.9 |
| 8 am |
| 1.9 |
| 9 am |
| 1.3 |
| 10 am |
| 1.2 |
| 11 am |
| 1.9 |
| 12 pm |
| 3 |
| 1 pm |
| 4.2 |
| 2 pm |
| 5.2 |
| 3 pm |
| 5.8 |
| 4 pm |
| 5.8 |
| 5 pm |
| 5.1 |
| 6 pm |
| 4.1 |
| 7 pm |
| 3 |
| 8 pm |
| 2 |
| 9 pm |
| 1.3 |
| 10 pm |
| 1.2 |
| 11 pm |
| 1.7 |
| St. Johns River Entrance Click for Map Mon -- 02:54 AM EDT 1.94 knots Max Flood Mon -- 02:57 AM EDT Moonrise Mon -- 06:00 AM EDT -0.00 knots Slack Mon -- 06:51 AM EDT Sunrise Mon -- 08:24 AM EDT -1.51 knots Max Ebb Mon -- 12:56 PM EDT 0.00 knots Slack Mon -- 01:24 PM EDT Moonset Mon -- 03:25 PM EDT 1.55 knots Max Flood Mon -- 06:14 PM EDT -0.00 knots Slack Mon -- 07:58 PM EDT Sunset Mon -- 08:41 PM EDT -1.53 knots Max Ebb Tide / Current data from XTide NOT FOR NAVIGATION |
St. Johns River Entrance, Florida Current (3), knots
| 12 am |
| 0.2 |
| 1 am |
| 0.8 |
| 2 am |
| 1.6 |
| 3 am |
| 1.9 |
| 4 am |
| 1.6 |
| 5 am |
| 0.9 |
| 6 am |
| 0 |
| 7 am |
| -1 |
| 8 am |
| -1.5 |
| 9 am |
| -1.4 |
| 10 am |
| -1.1 |
| 11 am |
| -0.8 |
| 12 pm |
| -0.4 |
| 1 pm |
| 0 |
| 2 pm |
| 0.8 |
| 3 pm |
| 1.5 |
| 4 pm |
| 1.5 |
| 5 pm |
| 1 |
| 6 pm |
| 0.2 |
| 7 pm |
| -0.7 |
| 8 pm |
| -1.4 |
| 9 pm |
| -1.5 |
| 10 pm |
| -1.2 |
| 11 pm |
| -0.8 |
Area Discussion for Jacksonville, FL
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FXUS62 KJAX 220535 AFDJAX
Area Forecast Discussion National Weather Service Jacksonville FL 135 AM EDT Tue Apr 22 2025
New AVIATION
UPDATE
Issued at 858 PM EDT Mon Apr 21 2025
For the latest NE FL and SE GA Daily Key Messages please visit: https:// www.weather.gov/media/jax/briefings/nws-jax-briefing.pdf
Forecast remains on track tonight as high clouds continue to stream northward across NE FL/SE GA on the back side of the mid level ridge over the Western Atlantic. Mild temps will continue with lows only falling into the lower 60s inland and mid/upper 60s along the Atlantic Coast and St. Johns River Basin as south winds remain elevated at 5-10 mph through the overnight hours. High clouds should prevent much in the way of any significant fog formation except for some patchy fog over inland North FL along the Suwannee Valley around sunrise Tuesday morning. A mixture of high clouds and partial sunshine expected again on Tuesday with above normal temps continue in the southerly steering flow with upper 80s/near 90F expected over inland areas, while the East Coast sea breeze front will push inland and keep Coastal areas with highs in the lower/middle 80s. Models still suggesting enough atmospheric moisture increase with PWATs reaching close to 1.25", which may be enough to kick off an isolated shower as the East Coast sea breeze moves inland, mainly across inland SE GA, but overall rainfall chances remain only around 10%, except for some pockets of 15-20% across inland SE GA late in the day into the early evening hours.
NEAR TERM
(Through Tonight)
Issued at 206 PM EDT Mon Apr 21 2025
For the latest NE FL and SE GA Daily Key Messages please visit: https:// www.weather.gov/media/jax/briefings/nws-jax-briefing.pdf
Atlantic sea breeze is already making its way towards the JAX metro area early this afternoon as a light southerly flow will allow for both the Gulf and Atlantic sea breezes to move inland this afternoon. Current temps show a few locations still hovering in the upper 70s, but most locations have already reached into the lower/mid 80s. Temps expected to continue to rise into the upper 80s as peak heating nears, but with the sea breezes steadily making their way inland, the cooler marine air will help to keep most locations from reaching into the 90s. By this evening and overnight, lows will drop into the lower 60s for inland locations west of the I-95 corridor, while the upper 60s is expected for locations from the coast and east towards the I-95 corridor.
Patchy fog will be possible for locations west of US-301 and towards the I-75 corridor as winds will be near calm during the overnight hours.
SHORT TERM
(Tuesday through Wednesday night)
Issued at 206 PM EDT Mon Apr 21 2025
Deep layer ridge will remain entrenched just north of the Bahamas and portions of south FL on Tuesday while a weak front moves down into the Carolinas and northern GA. The south portions of a mid to upper level shortwave will pass over parts of our southeast GA zones that may help support some low chances for a shower or a thunderstorm (only about 10 percent) mainly to the north of Waycross late Tue aftn and evening. Otherwise, warm and dry conditions persist Tuesday (near record high at AMG), and again mild lows Tue night into the 60s.
Wednesday, a mid to upper level ridge persists over eastern Gulf, central FL, and just north of the Bahamas, but another mid level trough/vorticity lobe will move adjacent to our north zones near a stalled front across South Carolina and north GA. With sea breezes and higher moisture, slightly better shower and thunderstorm chances of around 15-30 percent are indicated mainly over inland southeast GA, and possibly as far as south as I-10 to around Lake City, as daytime heating and sufficient moisture can overcome a subsidence inversion. Near record highs at Alma, Craig, and Gainesville.
Wed night, any lingering weak convection Wed evening should fade with loss of heating, with mild overnight lows in the 60s again.
LONG TERM
(Thursday through next Monday)
Issued at 206 PM EDT Mon Apr 21 2025
Surface high pressure ridge remains the dominant surface weather feature Thursday through Friday but enough weakness in mid level ridge is noted across mainly north parts of the area where there are hints of a weak trough of low pressure in the model guidance.
This latter feature combined with enough moisture south of a front and the ridge of high pressure will support some low chances for showers and a few storms across southeast GA.
A change in the pattern in store by Saturday as the surface ridge drifts southward as a frontal boundary is able to push into southern GA Saturday night and then through northeast FL on Sunday. We showed chance of showers and slight chance of thunder for Sunday as the front will be moving through, with thunder chances a bit better for northeast FL on Sunday.
With the ridge in place and plentiful sunshine over the area Thu- Sat will again lead to near record high temperatures to the area, especially away from the coast with lower 90s (see climate section)
into the weekend while the coast warms into the mid 80s at the beachfront to the upper 80s along I-95 and lower 90s just west of US-17. Lows will rise slowly from the lower 60s inland into the mid 60s and to the upper 60s at the coast and along the St Johns river.
AVIATION
(06Z TAFS)
Issued at 134 AM EDT Tue Apr 22 2025
The 06Z TAF period will feature VFR conditions through the period with exception of restrictions for MVFR fog at VQQ early this morning between 07Z-11Z. Broken to overcast veil of high clouds will persist through the forecast period as well moving around the periphery of a ridge aloft east of the FL peninsula that will shift over the Bahamas through tonight. Weak high pressure axis extending from the Atlantic waters will promote Atlantic seabreeze circulation, causing southerly winds 5-10 knots to rise to 12-15 knots at the coast after 16Z and press through CRG/JAX/VQQ at 18Z/20Z/21Z with 10-12 knots of southeasterly winds, before weakening near GNV by 23Z. Low level clouds bases around 4.0 kft will rise to 5.0-6.0 kft by afternoon with conditions too dry to produce any showers for Tuesday.
Winds will weaken and turn southerly after 03Z under 5 knots inland and near 5-7 knots at the coast. Some MVFR fog potential at JAX and VQQ after 06Z Wednesday morning.
MARINE
Issued at 206 PM EDT Mon Apr 21 2025
Low seas, 3-4ft, and breezy south-southeasterly winds will continue for most of the upcoming week as high pressure remains over the western Atlantic. The next frontal system will be possible this weekend as a backdoor front attempts to slide in from the northeast on Sunday.
Rip Currents: Moderate risk of rip currents across area beaches through midweek.
FIRE WEATHER
Issued at 206 PM EDT Mon Apr 21 2025
Continued dry conditions for all the area with the driest conditions per KBDI data over the south parts from Flagler, Putnam, to Marion counties. Overall, minrh values will be lowest inland near 30-35 percent so no red flags. Main headlines are the patchy high daytime dispersion today and Tuesday
CLIMATE
Issued at 206 PM EDT Mon Apr 21 2025
Record High Temperatures:
April 23rd: KJAX: 92/1970 KCRG: 89/2020 KAMG: 94/1968 KGNV: 92/1970
April 25th: KJAX: 92/1958 KCRG: 91/2006 KAMG: 91/1958 KGNV: 93/1896
April 26th: KJAX: 92/2011 KCRG: 91/1989 KAMG: 93/1986 KGNV: 93/1908
PRELIMINARY POINT TEMPS/POPS
AMG 89 62 88 63 / 10 20 20 10 SSI 80 67 82 68 / 10 0 10 10 JAX 88 63 87 65 / 10 0 10 10 SGJ 84 64 84 66 / 0 0 10 10 GNV 90 62 90 63 / 10 0 10 10 OCF 91 61 90 63 / 0 0 10 10
JAX WATCHES/WARNINGS/ADVISORIES
FL...None.
GA...None.
AM...None.
Area Forecast Discussion National Weather Service Jacksonville FL 135 AM EDT Tue Apr 22 2025
New AVIATION
UPDATE
Issued at 858 PM EDT Mon Apr 21 2025
For the latest NE FL and SE GA Daily Key Messages please visit: https:// www.weather.gov/media/jax/briefings/nws-jax-briefing.pdf
Forecast remains on track tonight as high clouds continue to stream northward across NE FL/SE GA on the back side of the mid level ridge over the Western Atlantic. Mild temps will continue with lows only falling into the lower 60s inland and mid/upper 60s along the Atlantic Coast and St. Johns River Basin as south winds remain elevated at 5-10 mph through the overnight hours. High clouds should prevent much in the way of any significant fog formation except for some patchy fog over inland North FL along the Suwannee Valley around sunrise Tuesday morning. A mixture of high clouds and partial sunshine expected again on Tuesday with above normal temps continue in the southerly steering flow with upper 80s/near 90F expected over inland areas, while the East Coast sea breeze front will push inland and keep Coastal areas with highs in the lower/middle 80s. Models still suggesting enough atmospheric moisture increase with PWATs reaching close to 1.25", which may be enough to kick off an isolated shower as the East Coast sea breeze moves inland, mainly across inland SE GA, but overall rainfall chances remain only around 10%, except for some pockets of 15-20% across inland SE GA late in the day into the early evening hours.
NEAR TERM
(Through Tonight)
Issued at 206 PM EDT Mon Apr 21 2025
For the latest NE FL and SE GA Daily Key Messages please visit: https:// www.weather.gov/media/jax/briefings/nws-jax-briefing.pdf
Atlantic sea breeze is already making its way towards the JAX metro area early this afternoon as a light southerly flow will allow for both the Gulf and Atlantic sea breezes to move inland this afternoon. Current temps show a few locations still hovering in the upper 70s, but most locations have already reached into the lower/mid 80s. Temps expected to continue to rise into the upper 80s as peak heating nears, but with the sea breezes steadily making their way inland, the cooler marine air will help to keep most locations from reaching into the 90s. By this evening and overnight, lows will drop into the lower 60s for inland locations west of the I-95 corridor, while the upper 60s is expected for locations from the coast and east towards the I-95 corridor.
Patchy fog will be possible for locations west of US-301 and towards the I-75 corridor as winds will be near calm during the overnight hours.
SHORT TERM
(Tuesday through Wednesday night)
Issued at 206 PM EDT Mon Apr 21 2025
Deep layer ridge will remain entrenched just north of the Bahamas and portions of south FL on Tuesday while a weak front moves down into the Carolinas and northern GA. The south portions of a mid to upper level shortwave will pass over parts of our southeast GA zones that may help support some low chances for a shower or a thunderstorm (only about 10 percent) mainly to the north of Waycross late Tue aftn and evening. Otherwise, warm and dry conditions persist Tuesday (near record high at AMG), and again mild lows Tue night into the 60s.
Wednesday, a mid to upper level ridge persists over eastern Gulf, central FL, and just north of the Bahamas, but another mid level trough/vorticity lobe will move adjacent to our north zones near a stalled front across South Carolina and north GA. With sea breezes and higher moisture, slightly better shower and thunderstorm chances of around 15-30 percent are indicated mainly over inland southeast GA, and possibly as far as south as I-10 to around Lake City, as daytime heating and sufficient moisture can overcome a subsidence inversion. Near record highs at Alma, Craig, and Gainesville.
Wed night, any lingering weak convection Wed evening should fade with loss of heating, with mild overnight lows in the 60s again.
LONG TERM
(Thursday through next Monday)
Issued at 206 PM EDT Mon Apr 21 2025
Surface high pressure ridge remains the dominant surface weather feature Thursday through Friday but enough weakness in mid level ridge is noted across mainly north parts of the area where there are hints of a weak trough of low pressure in the model guidance.
This latter feature combined with enough moisture south of a front and the ridge of high pressure will support some low chances for showers and a few storms across southeast GA.
A change in the pattern in store by Saturday as the surface ridge drifts southward as a frontal boundary is able to push into southern GA Saturday night and then through northeast FL on Sunday. We showed chance of showers and slight chance of thunder for Sunday as the front will be moving through, with thunder chances a bit better for northeast FL on Sunday.
With the ridge in place and plentiful sunshine over the area Thu- Sat will again lead to near record high temperatures to the area, especially away from the coast with lower 90s (see climate section)
into the weekend while the coast warms into the mid 80s at the beachfront to the upper 80s along I-95 and lower 90s just west of US-17. Lows will rise slowly from the lower 60s inland into the mid 60s and to the upper 60s at the coast and along the St Johns river.
AVIATION
(06Z TAFS)
Issued at 134 AM EDT Tue Apr 22 2025
The 06Z TAF period will feature VFR conditions through the period with exception of restrictions for MVFR fog at VQQ early this morning between 07Z-11Z. Broken to overcast veil of high clouds will persist through the forecast period as well moving around the periphery of a ridge aloft east of the FL peninsula that will shift over the Bahamas through tonight. Weak high pressure axis extending from the Atlantic waters will promote Atlantic seabreeze circulation, causing southerly winds 5-10 knots to rise to 12-15 knots at the coast after 16Z and press through CRG/JAX/VQQ at 18Z/20Z/21Z with 10-12 knots of southeasterly winds, before weakening near GNV by 23Z. Low level clouds bases around 4.0 kft will rise to 5.0-6.0 kft by afternoon with conditions too dry to produce any showers for Tuesday.
Winds will weaken and turn southerly after 03Z under 5 knots inland and near 5-7 knots at the coast. Some MVFR fog potential at JAX and VQQ after 06Z Wednesday morning.
MARINE
Issued at 206 PM EDT Mon Apr 21 2025
Low seas, 3-4ft, and breezy south-southeasterly winds will continue for most of the upcoming week as high pressure remains over the western Atlantic. The next frontal system will be possible this weekend as a backdoor front attempts to slide in from the northeast on Sunday.
Rip Currents: Moderate risk of rip currents across area beaches through midweek.
FIRE WEATHER
Issued at 206 PM EDT Mon Apr 21 2025
Continued dry conditions for all the area with the driest conditions per KBDI data over the south parts from Flagler, Putnam, to Marion counties. Overall, minrh values will be lowest inland near 30-35 percent so no red flags. Main headlines are the patchy high daytime dispersion today and Tuesday
CLIMATE
Issued at 206 PM EDT Mon Apr 21 2025
Record High Temperatures:
April 23rd: KJAX: 92/1970 KCRG: 89/2020 KAMG: 94/1968 KGNV: 92/1970
April 25th: KJAX: 92/1958 KCRG: 91/2006 KAMG: 91/1958 KGNV: 93/1896
April 26th: KJAX: 92/2011 KCRG: 91/1989 KAMG: 93/1986 KGNV: 93/1908
PRELIMINARY POINT TEMPS/POPS
AMG 89 62 88 63 / 10 20 20 10 SSI 80 67 82 68 / 10 0 10 10 JAX 88 63 87 65 / 10 0 10 10 SGJ 84 64 84 66 / 0 0 10 10 GNV 90 62 90 63 / 10 0 10 10 OCF 91 61 90 63 / 0 0 10 10
JAX WATCHES/WARNINGS/ADVISORIES
FL...None.
GA...None.
AM...None.
| Stations | Dist | Age | Wind | Air | Water | Waves | inHg | DewPt |
| SAXG1 - Sapelo Island Reserve, GA | 21 mi | 63 min | S 8 | 70°F | 30.15 | 66°F | ||
| KBMG1 | 25 mi | 45 min | 73°F | 30.15 | ||||
| 41112 - Offshore Fernandina Beach, FL (132) | 30 mi | 37 min | 72°F | 3 ft | ||||
| FRDF1 - 8720030 - Fernandina Beach, FL | 32 mi | 45 min | SSE 5.1G | 74°F | 75°F | 30.13 | ||
| 41008 - GRAYS REEF - 40 NM Southeast of Savannah, GA | 33 mi | 33 min | S 12G | 72°F | 72°F | 30.14 | 70°F |
Wind History for Fernandina Beach, FL
toggle option: (graph/table)
Link to 1 hour of 5 minute data for KSSI
Terminal Aerodrome Forecast (TAF) for KSSI
Wind History Graph: SSI
(wind in knots)
GEOS Local Image of southeast
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Jacksonville, FL,
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