Marine Weather and Tide Forecast for Whitemarsh Island, GA
April 29, 2025 5:06 AM EDT (09:06 UTC)
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![]() | Sunrise 6:38 AM Sunset 8:05 PM Moonrise 6:45 AM Moonset 9:47 PM |
AMZ354 Waters From Savannah Ga To Altamaha Sound Ga Out 20 Nm, Including Grays Reef National Marine Sanctuary- 255 Am Edt Tue Apr 29 2025
Today - E winds 10 kt. Seas 3 to 4 ft, subsiding to 2 to 3 ft this afternoon. Wave detail: E 4 ft at 7 seconds, becoming E 3 ft at 8 seconds.
Tonight - SE winds 5 to 10 kt. Seas 2 to 3 ft. Wave detail: E 3 ft at 8 seconds.
Wed - SE winds 5 to 10 kt. Seas 2 to 3 ft. Wave detail: E 3 ft at 7 seconds.
Wed night - S winds 10 kt. Seas 2 to 3 ft. Wave detail: E 3 ft at 8 seconds.
Thu - S winds 5 to 10 kt. Seas 2 to 3 ft. Wave detail: E 3 ft at 8 seconds.
Thu night - S winds 10 to 15 kt. Seas 3 ft. Wave detail: se 3 ft at 8 seconds and S 2 ft at 4 seconds.
Fri - S winds 10 to 15 kt. Seas 3 ft.
Fri night - S winds 10 to 15 kt. Seas 3 to 4 ft. A chance of showers.
Sat - SW winds 10 to 15 kt. Seas 3 to 4 ft. A chance of showers and tstms.
Sat night - W winds 10 to 15 kt. Seas 2 to 3 ft. A chance of showers with a slight chance of tstms.
winds and seas higher in and near tstms.
winds and seas higher in and near tstms.
AMZ300 255 Am Edt Tue Apr 29 2025
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia - High pressure will prevail through Thursday. A cold front will move through Saturday, followed by high pressure.
7 Day Forecast for Marine Location Near Whitemarsh Island, GA

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Fort Jackson Click for Map Tue -- 05:00 AM EDT -0.57 feet Low Tide Tue -- 06:39 AM EDT Sunrise Tue -- 07:45 AM EDT Moonrise Tue -- 10:34 AM EDT 7.46 feet High Tide Tue -- 05:07 PM EDT -0.76 feet Low Tide Tue -- 08:03 PM EDT Sunset Tue -- 10:47 PM EDT Moonset Tue -- 10:54 PM EDT 8.93 feet High Tide Tide / Current data from XTide NOT FOR NAVIGATION |   |
Fort Jackson, Savannah River, Georgia, Tide feet
12 am |
7.7 |
1 am |
6 |
2 am |
4 |
3 am |
1.9 |
4 am |
0.2 |
5 am |
-0.6 |
6 am |
0.2 |
7 am |
2.2 |
8 am |
4.5 |
9 am |
6.4 |
10 am |
7.3 |
11 am |
7.4 |
12 pm |
6.8 |
1 pm |
5.5 |
2 pm |
3.7 |
3 pm |
1.8 |
4 pm |
0.1 |
5 pm |
-0.8 |
6 pm |
-0.1 |
7 pm |
2 |
8 pm |
4.7 |
9 pm |
7.1 |
10 pm |
8.6 |
11 pm |
8.9 |
Savannah River Entrance Click for Map Tue -- 02:04 AM EDT -2.63 knots Max Ebb Tue -- 05:06 AM EDT 0.00 knots Slack Tue -- 06:39 AM EDT Sunrise Tue -- 07:36 AM EDT 2.21 knots Max Flood Tue -- 07:45 AM EDT Moonrise Tue -- 11:09 AM EDT -0.00 knots Slack Tue -- 02:20 PM EDT -2.34 knots Max Ebb Tue -- 05:09 PM EDT 0.01 knots Slack Tue -- 07:54 PM EDT 2.87 knots Max Flood Tue -- 08:02 PM EDT Sunset Tue -- 10:46 PM EDT Moonset Tue -- 11:40 PM EDT -0.01 knots Slack Tide / Current data from XTide NOT FOR NAVIGATION |   |
Savannah River Entrance, Georgia Current, knots
12 am |
-1.6 |
1 am |
-2.4 |
2 am |
-2.6 |
3 am |
-2.4 |
4 am |
-1.6 |
5 am |
-0.2 |
6 am |
1.2 |
7 am |
2.1 |
8 am |
2.2 |
9 am |
1.7 |
10 am |
1.1 |
11 am |
0.2 |
12 pm |
-1 |
1 pm |
-1.9 |
2 pm |
-2.3 |
3 pm |
-2.2 |
4 pm |
-1.6 |
5 pm |
-0.2 |
6 pm |
1.3 |
7 pm |
2.5 |
8 pm |
2.9 |
9 pm |
2.5 |
10 pm |
1.8 |
11 pm |
0.8 |
Area Discussion for Charleston, SC
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FXUS62 KCHS 290712 AFDCHS
Area Forecast Discussion National Weather Service Charleston SC 312 AM EDT Tue Apr 29 2025
SYNOPSIS
High pressure will prevail through Thursday. A cold front will move through Saturday, followed by high pressure.
NEAR TERM /THROUGH TONIGHT/
Today: Expansive subtropical ridging centered over the southwest Gulf will build across the Southeast U.S. today as large high pressure off the North Carolina Outer Banks maintains its influence on the region. The most favorable convective parameters will remain displaced well to the south and southwest.
Modified soundings show a weak subsidence inversion around 800 hPa holding through the day even as dewpoints surge a bit with the passage of the sea breeze later this afternoon. Some weak, surface based instability does develop over interior Southeast Georgia later this afternoon, but with the ridge building aloft, rain-free conditions will prevail. Low-level thickness schemes support highs in the lower-mid 80s across the interior with temperatures across the coastal counties being somewhat muted by a progressive pure sea breeze circulation. The beaches will only peak in the lower-mid 70s.
Tonight: The overall synoptic pattern will change little overnight. The boundary layer should decouple by mid-late evening as the sea breeze decays as it propagates into east- central Georgia, the CSRA and Southern Midlands. Clear skies and calm/light winds will support modest radiational cooling. Lows were trended down slightly as a result, ranging from the mid- upper 50s inland to the upper 60s/near 70 at the beaches and Downtown Charleston.
SHORT TERM /WEDNESDAY THROUGH FRIDAY/
A deep layered ridge will prevail Wednesday through Thursday, then weaken by Friday as a series of shortwaves approaches.
Temps will remain several degrees above normal with inland highs reaching the middle 80s. A robust sea breeze each afternoon will maintain considerably cooler temps along the coast.
Isolated showers and tstms will be possible Friday afternoon as moisture increases and a shortwave drops in from the northwest.
LONG TERM /FRIDAY NIGHT THROUGH MONDAY/
A cold front will drop south into the area Friday night and Saturday, then continue to push south by Sunday while dry high pressure builds from the north. Scattered to numerous showers and tstms expected Friday night and Saturday as the front moves through. Cooler, drier air will move in late weekend into early next week.
AVIATION /06Z TUESDAY THROUGH SATURDAY/
29/06 TAF Discussion: KCHS/KJZI/KSAV: VFR through 06z Wednesday.
Extended Aviation Outlook: Largely VFR. Showers and a few thunderstorms are possible Friday into Saturday and might lead to brief flight restrictions during that time.
MARINE
Through Tonight: There are no concerns. East winds will veer to the southeast this afternoon into tonight as high pressure off the North Carolina Outer Banks maintains its influence on the region. A slight surge in the Charleston Harbor and along the land/sea interface will accompany the pure sea breeze this afternoon, but winds should remain 15 kt or less. Seas 3-5 ft this morning will subside to 2-4 ft later today and linger into tonight.
Wednesday through Sunday: High pressure will prevail Wednesday through Friday, then a cold front will drop through on Saturday.
Conditions expected to remain below advisory levels.
Rip Currents: East to southeasterly flow along with easterly swell of 2 ft every 8 seconds will maintain a moderate rip current risk for all beaches today. A low risk returns for Wednesday.
TIDES/COASTAL FLOODING
Another round of coastal flooding is expected again late this evening across Charleston and Coastal Colleton counties. A Coastal Flood Advisory will likely be needed as tides should breach minor flood thresholds in the Charleston Harbor. Tide levels at Fort Pulaski should remain below minor flood thresholds so no meaningful issues are expected for the remainder of the lower South Carolina coast into coastal Georgia.
CHS WATCHES/WARNINGS/ADVISORIES
GA...None.
SC...None.
MARINE...None.
Area Forecast Discussion National Weather Service Charleston SC 312 AM EDT Tue Apr 29 2025
SYNOPSIS
High pressure will prevail through Thursday. A cold front will move through Saturday, followed by high pressure.
NEAR TERM /THROUGH TONIGHT/
Today: Expansive subtropical ridging centered over the southwest Gulf will build across the Southeast U.S. today as large high pressure off the North Carolina Outer Banks maintains its influence on the region. The most favorable convective parameters will remain displaced well to the south and southwest.
Modified soundings show a weak subsidence inversion around 800 hPa holding through the day even as dewpoints surge a bit with the passage of the sea breeze later this afternoon. Some weak, surface based instability does develop over interior Southeast Georgia later this afternoon, but with the ridge building aloft, rain-free conditions will prevail. Low-level thickness schemes support highs in the lower-mid 80s across the interior with temperatures across the coastal counties being somewhat muted by a progressive pure sea breeze circulation. The beaches will only peak in the lower-mid 70s.
Tonight: The overall synoptic pattern will change little overnight. The boundary layer should decouple by mid-late evening as the sea breeze decays as it propagates into east- central Georgia, the CSRA and Southern Midlands. Clear skies and calm/light winds will support modest radiational cooling. Lows were trended down slightly as a result, ranging from the mid- upper 50s inland to the upper 60s/near 70 at the beaches and Downtown Charleston.
SHORT TERM /WEDNESDAY THROUGH FRIDAY/
A deep layered ridge will prevail Wednesday through Thursday, then weaken by Friday as a series of shortwaves approaches.
Temps will remain several degrees above normal with inland highs reaching the middle 80s. A robust sea breeze each afternoon will maintain considerably cooler temps along the coast.
Isolated showers and tstms will be possible Friday afternoon as moisture increases and a shortwave drops in from the northwest.
LONG TERM /FRIDAY NIGHT THROUGH MONDAY/
A cold front will drop south into the area Friday night and Saturday, then continue to push south by Sunday while dry high pressure builds from the north. Scattered to numerous showers and tstms expected Friday night and Saturday as the front moves through. Cooler, drier air will move in late weekend into early next week.
AVIATION /06Z TUESDAY THROUGH SATURDAY/
29/06 TAF Discussion: KCHS/KJZI/KSAV: VFR through 06z Wednesday.
Extended Aviation Outlook: Largely VFR. Showers and a few thunderstorms are possible Friday into Saturday and might lead to brief flight restrictions during that time.
MARINE
Through Tonight: There are no concerns. East winds will veer to the southeast this afternoon into tonight as high pressure off the North Carolina Outer Banks maintains its influence on the region. A slight surge in the Charleston Harbor and along the land/sea interface will accompany the pure sea breeze this afternoon, but winds should remain 15 kt or less. Seas 3-5 ft this morning will subside to 2-4 ft later today and linger into tonight.
Wednesday through Sunday: High pressure will prevail Wednesday through Friday, then a cold front will drop through on Saturday.
Conditions expected to remain below advisory levels.
Rip Currents: East to southeasterly flow along with easterly swell of 2 ft every 8 seconds will maintain a moderate rip current risk for all beaches today. A low risk returns for Wednesday.
TIDES/COASTAL FLOODING
Another round of coastal flooding is expected again late this evening across Charleston and Coastal Colleton counties. A Coastal Flood Advisory will likely be needed as tides should breach minor flood thresholds in the Charleston Harbor. Tide levels at Fort Pulaski should remain below minor flood thresholds so no meaningful issues are expected for the remainder of the lower South Carolina coast into coastal Georgia.
CHS WATCHES/WARNINGS/ADVISORIES
GA...None.
SC...None.
MARINE...None.
Stations | Dist | Age | Wind | Air | Water | Waves | inHg | DewPt |
FPKG1 - 8670870 - Fort Pulaski, GA | 7 mi | 49 min | SSE 5.1G | 70°F | 74°F | 30.24 | ||
41033 | 36 mi | 59 min | SE 7.8G | 72°F | 30.24 | |||
41067 | 36 mi | 67 min | 71°F | 3 ft | ||||
ACXS1 - ACE Basin Reserve, SC | 45 mi | 82 min | 0 | 62°F | 30.24 | 62°F | ||
41008 - GRAYS REEF - 40 NM Southeast of Savannah, GA | 48 mi | 37 min | ESE 12G | 72°F | 72°F | 30.22 | 66°F | |
SAXG1 - Sapelo Island Reserve, GA | 48 mi | 67 min | ESE 7 | 70°F | 30.21 | 62°F |
Wind History for Fort Pulaski, GA
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Airport Reports
Link to 1 hour of 5 minute data for KSVN
Terminal Aerodrome Forecast (TAF) for KSVN
Wind History Graph: SVN
(wind in knots)GEOS Local Image of Southeast
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Charleston, SC,

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