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Marine Weather and Tide Forecast for St. Marys, GA

April 28, 2025 3:32 PM EDT (19:32 UTC)
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Sunrise 6:43 AM   Sunset 8:04 PM
Moonrise 6:04 AM   Moonset 8:30 PM 
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NOTE: Some of the data on this page has not been verified and should be used with that in mind. It may and occasionally will, be wrong. The tide reports are by xtide and are NOT FOR NAVIGATION.

Marine Forecasts
   
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NOTE: Zones were updated 3/20/2025
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- 214 Pm Edt Mon Apr 28 2025

.small craft exercise caution - .

Rest of today - East winds increasing to 15 to 20 knots. Seas 3 to 4 feet, occasionally to 5 feet. Wave detail: east 4 feet at 7 seconds. Intracoastal waters a moderate chop. A chance of showers with a slight chance of Thunderstorms.

Tonight - East winds around 15 to 20 knots. Seas 4 to 5 feet, occasionally to 6 feet. Wave detail: east 4 feet at 6 seconds. Intracoastal waters a moderate chop. A slight chance of showers and Thunderstorms.

Tuesday - East winds 10 to 15 knots. Seas 3 to 5 feet, occasionally to 6 feet. Wave detail: east 4 feet at 7 seconds. Intracoastal waters a moderate chop. A slight chance of showers in the morning.

Tuesday night - Southeast winds 5 to 10 knots. Seas 3 to 4 feet, occasionally to 5 feet. Wave detail: east 4 feet at 7 seconds. Intracoastal waters light chop.

Wednesday and Wednesday night - South winds 5 to 10 knots. Seas around 3 feet. Wave detail: east 3 feet at 8 seconds. Intracoastal waters light chop.

Thursday - South winds 10 to 15 knots. Seas 2 to 4 feet, occasionally to 5 feet. Wave detail: southeast 4 feet at 8 seconds and southeast 2 feet at 4 seconds. Intracoastal waters a moderate chop.

Friday - South winds 10 to 15 knots. Seas 3 to 4 feet, occasionally to 5 feet. Intracoastal waters a moderate chop. A slight chance of showers and Thunderstorms through the night.
winds and waves higher in and near Thunderstorms.
AMZ400 Synopsis For Altamaha Sound Ga To Flagler Beach Fl Out To 60 Nm- 214 Pm Edt Mon Apr 28 2025

Synopsis -
a cold front that lies east to west across the northeast florida waters will shift south through tonight. A few Thunderstorms are expected through tonight along and just behind the front along with breezy east to northeast winds and building seas. A high pressure ridge behind the front will move southeast off the mid atlantic coast Tuesday and be well east of the florida peninsula the remainder of the week.

Gulf stream -
the approximate location of the west wall of the gulf stream as of apr 26, 2025 at 1200 utc - .
64 nautical miles east of flagler beach. 66 nautical miles east of saint augustine beach. 75 nautical miles east of jacksonville beach. 87 nautical miles east southeast of st simons island.
this data courtesy of the naval oceanographic office.

7 Day Forecast for Marine Location Near St. Marys, GA
   
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Tide / Current for St. Marys, St. Marys River, Florida
  
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St. Marys
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Mon -- 04:26 AM EDT     -0.72 feet Low Tide
Mon -- 06:44 AM EDT     Sunrise
Mon -- 07:03 AM EDT     Moonrise
Mon -- 10:38 AM EDT     6.52 feet High Tide
Mon -- 04:31 PM EDT     -0.96 feet Low Tide
Mon -- 08:02 PM EDT     Sunset
Mon -- 09:30 PM EDT     Moonset
Mon -- 11:05 PM EDT     7.90 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
        
  Sorry, St. Marys, St. Marys River, Florida does not exist in database. Press Edit above and select a valid nearby location.

St. Marys, St. Marys River, Florida, Tide feet
12
am
6.4
1
am
4.5
2
am
2.3
3
am
0.5
4
am
-0.6
5
am
-0.5
6
am
0.6
7
am
2.3
8
am
4
9
am
5.5
10
am
6.3
11
am
6.5
12
pm
5.7
1
pm
4.1
2
pm
2.2
3
pm
0.4
4
pm
-0.8
5
pm
-0.8
6
pm
0.4
7
pm
2.3
8
pm
4.3
9
pm
6.1
10
pm
7.4
11
pm
7.9

Tide / Current for St. Johns River Entrance, Florida Current (3)
  
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St. Johns River Entrance
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Mon -- 02:32 AM EDT     -2.54 knots Max Ebb
Mon -- 06:26 AM EDT     0.00 knots Slack
Mon -- 06:44 AM EDT     Sunrise
Mon -- 07:03 AM EDT     Moonrise
Mon -- 08:58 AM EDT     2.42 knots Max Flood
Mon -- 11:47 AM EDT     -0.00 knots Slack
Mon -- 02:31 PM EDT     -2.55 knots Max Ebb
Mon -- 06:10 PM EDT     0.00 knots Slack
Mon -- 08:02 PM EDT     Sunset
Mon -- 09:22 PM EDT     3.35 knots Max Flood
Mon -- 09:30 PM EDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
        
  Sorry, St. Johns River Entrance, Florida Current (3) does not exist in database. Press Edit above and select a valid nearby location.

St. Johns River Entrance, Florida Current (3), knots
12
am
-0.4
1
am
-1.8
2
am
-2.5
3
am
-2.5
4
am
-2
5
am
-1.4
6
am
-0.5
7
am
0.7
8
am
1.9
9
am
2.4
10
am
2
11
am
1.1
12
pm
-0.3
1
pm
-1.7
2
pm
-2.5
3
pm
-2.5
4
pm
-2
5
pm
-1.1
6
pm
-0.2
7
pm
1
8
pm
2.4
9
pm
3.3
10
pm
3.2
11
pm
2.3

Area Discussion for Jacksonville, FL
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FXUS62 KJAX 281844 AFDJAX

Area Forecast Discussion National Weather Service Jacksonville FL 244 PM EDT Mon Apr 28 2025

...ISOLATED STRONG STORMS POSSIBLE THIS AFTERNOON INLAND NORTHEAST FL...

BENEFICIAL RAIN FOR SOME AREAS TODAY

New NEAR TERM, SHORT TERM, LONG TERM, MARINE

NEAR TERM
(Rest of Today through Tonight)
Issued at 230 PM EDT Mon Apr 28 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

The cold frontal boundary across northeast FL has become more ill-defined, but appears to be near or south of a line from St Augustine to near and north of Live Oak and Lake City. The diffuse boundary will generally continue to weaken, but support a good chance of showers and t-storms by later in the afternoon, as east- southeast flow moves up against the west coast sea breeze in the 4 PM-8 PM time frame. This area of enhanced chances extends across inland northeast FL mainly the I-75 corridor to inland southeast GA near about Echols county. MLCAPE in this area expected to be about 1500-1800 J/kg, along with weak shear (20-25 kt), and marginal environmental conditions for hail and gusty winds. Heavy rainfall likely in the stronger storms with rainfall amounts that potentially reach 3-4 inches, locally higher. Thus, there is potential for a few strong storms in this area.

Convection activity should wane by mid to late evening and likely dissipating by midnight inland zones. However, a contained low chance for a few coastal showers that probably move past I-95 before dissipating further inland, given low level convergence and more than sufficient low level moisture available. Lows tonight expected in the mid 60s, and about 70 at the coast with a light east breeze. Some patchy light fog potential and low stratus, but low confidence and low chance seen at this time.

SHORT TERM
(Tuesday through Wednesday night)
Issued at 230 PM EDT Mon Apr 28 2025

Easterly winds continue through Tuesday, shifting to south- southeasterly by Wednesday morning as surface high pressure gradually will shift southeastward along the Atlantic coast from the Carolinas. With the easterly flow, the Atlantic sea breeze is expected to push well inland on Tuesday. Chances of showers along the coast during the morning hours will spread westward through the morning hours. Diurnal heating will bring daytime highs for western locations into the mid 80s, with lower 80s expected for locations eastward of the I-75 corridor. Chances of showers and storms will increase by the afternoon hours as the Atlantic sea breeze meets with the Gulf sea breeze between I-75 and US-301.
Most activity will begin to tamper off with the loss of diurnal heating.

Drier air and subsidence will suppress convection on Wednesday with high pressure over the western Atlantic. Daytime highs will follow a similar pattern as Tuesday, warmer temps in the upper 80s for well inland locations, and highs in the lower to mid 80s from the coast towards US-301.

LONG TERM
(Thursday through next Monday)
Issued at 230 PM EDT Mon Apr 28 2025

The high pressure over the western Atlantic will begin to shift towards the east on Thursday ahead of a trough of low pressure digging into the SE CONUS. The associated frontal boundary will begin to cross into SE GA during the overnight hours on Friday to Saturday. Showers and storms will look to develop ahead of the frontal boundary on Friday afternoon over SE GA, then north of the I-10 corridor and coastal locations by Friday evening. The frontal boundary will push south of north central FL by Saturday evening. Diurnal instability, sea breeze interactions, and left over convergence north of the front will result in isolated to scattered showers/storms on Saturday.Temperatures return to above seasonable for the end of the week.

AVIATION
(18Z TAFS)
Issued at 205 PM EDT Mon Apr 28 2025

A lull in the convection at this time, and the cold frontal looks to be near and south of I-10 corridor at 18z. Expect convergence to lead to some VCSH and possibly VCTS for coastal TAF sites through about 23Z/00z, with VQQ possibly get a TSRA at the site.
For inland at GNV, there is a bit better chance of TSRA have maintained a TEMPO group there and just shifted ahead 1 hour in the updated 18z TAF package. Ongoing convection after about 21z is expected to largely be inland northeast FL. During the mid to late evening, only isolated shower or a storm and at most a VCSH is needed at this time. Early Tuesday morning, some chance for low stratus and fog inland areas and at this time showed scattered low deck at GNV and MVFR vsby at VQQ. Mostly VFR cigs Tuesday after 12z with a few showers developing in the 13z-18z time frame for coastal TAF areas.

MARINE
Issued at 230 PM EDT Mon Apr 28 2025

Breezy easterly winds and building seas expected through tonight with some gradual decrease Tuesday to Tuesday night time frame.
Seas peak by tonight at 4-6 ft. Winds and seas are near Small Craft Exercise Caution into Tonight so these headlines continue.
Weakening gradient will support lower winds and seas Wednesday as a high pressure ridge builds in. Winds turn more southeast Wed night into late week as the ridge drops southward with winds down to 10-15 kt and seas near 3-4 ft.

Rip Currents: Building rough surf from easterly winds will support a high risk of rip currents through Tuesday. Probably still looking at a solid moderate risk on Wednesday.

PRELIMINARY POINT TEMPS/POPS
AMG 63 83 60 86 / 10 20 0 0 SSI 69 80 68 81 / 20 20 0 0 JAX 66 82 62 84 / 20 20 0 0 SGJ 69 81 65 81 / 20 20 0 0 GNV 65 85 60 87 / 30 30 0 0 OCF 66 86 61 88 / 30 40 0 0

JAX WATCHES/WARNINGS/ADVISORIES
FL...High Rip Current Risk through late Tuesday night for FLZ124-125- 138-233-333.

GA...High Rip Current Risk through late Tuesday night for GAZ154-166.

AM...None.


Weather Reporting Stations
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Stations Dist Age Wind AirWater WavesinHgDewPt
FRDF1 - 8720030 - Fernandina Beach, FL 5 mi45 minENE 4.1G9.9 78°F 78°F30.22
KBMG1 5 mi45 min 74°F 30.24
41112 - Offshore Fernandina Beach, FL (132) 14 mi37 min 76°F3 ft
NFDF1 22 mi45 minNE 9.9G13 76°F 30.2171°F
BLIF1 23 mi45 minENE 9.9G13 76°F 30.24
DMSF1 23 mi45 min 78°F
MYPF1 - 8720218 - Mayport (Bar Pilots Dock), FL 23 mi45 minENE 12G15 73°F 77°F30.25
LTJF1 24 mi45 min 73°F 70°F
JXUF1 26 mi45 min 79°F
BKBF1 37 mi45 minE 12G14 79°F 30.20


Wind History for Fernandina Beach, FL
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Airport Reports
   
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AirportDistAgeWind ktVisSkyWeatherAirDewPtRHinHg
KFHB FERNANDINA BEACH MUNI,FL 9 sm17 minE 1310 smPartly Cloudy77°F66°F69%30.23
KJAX JACKSONVILLE INTL,FL 18 sm36 minENE 1410 smMostly Cloudy81°F64°F58%30.21
KNRB MAYPORT NS (ADM DAVID L MCDONALD FIELD),FL 24 sm40 minENE 1310 smMostly Cloudy81°F64°F58%30.23

Weather Map
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GEOS Local Image of southeast  
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Jacksonville, FL,





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