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Marine Weather and Tide Forecast for Kiawah Island, SC

April 22, 2025 6:28 PM EDT (22:28 UTC) Change Location
Sunrise 6:40 AM   Sunset 7:56 PM
Moonrise 2:33 AM   Moonset 1:21 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
AMZ330 Charleston Harbor- 342 Pm Edt Tue Apr 22 2025

This afternoon - S winds 10 to 15 kt.

Wed - S winds 5 to 10 kt, becoming se in the afternoon. A chance of showers and tstms in the afternoon.

Wed night - E winds 5 to 10 kt. A slight chance of showers and tstms.

Thu - E winds 5 to 10 kt, increasing to 10 kt in the afternoon. A chance of showers and tstms.

Thu night - E winds 5 to 10 kt. A chance of showers and tstms in the evening.

Fri - E winds 5 to 10 kt.

Fri night - S winds 5 to 10 kt.

Sat - SW winds 5 to 10 kt. A chance of showers and tstms.

Sat night - SW winds 5 to 10 kt. A chance of showers and tstms.

Sun - NE winds 10 to 15 kt. A slight chance of showers and tstms.

Sun night - NE winds 10 to 15 kt. A slight chance of showers and tstms.
winds and waves higher in and near tstms.
unless otherwise noted, waves 1 foot or less.
charleston harbor water temperature 73 degrees.
AMZ300 342 Pm Edt Tue Apr 22 2025

Synopsis for the coastal waters of south coastal south carolina and north coastal georgia - A cold front will slowly approach the region tonight, then become stationary over or near the area Wednesday into Thursday. A cold front will move through Saturday night or Sunday, with high pressure to build from the north early next week,

7 Day Forecast for Marine Location Near Kiawah Island, SC
   
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Tide / Current for Kiawah River Bridge, South Carolina
  
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Kiawah River Bridge
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Tue -- 03:33 AM EDT     Moonrise
Tue -- 03:46 AM EDT     5.58 feet High Tide
Tue -- 06:42 AM EDT     Sunrise
Tue -- 10:08 AM EDT     0.64 feet Low Tide
Tue -- 02:21 PM EDT     Moonset
Tue -- 04:14 PM EDT     5.18 feet High Tide
Tue -- 07:55 PM EDT     Sunset
Tue -- 10:25 PM EDT     0.63 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
        
  Sorry, Kiawah River Bridge, South Carolina does not exist in database. Press Edit above and select a valid nearby location.

Kiawah River Bridge, South Carolina, Tide feet
12
am
2.8
1
am
3.9
2
am
4.9
3
am
5.4
4
am
5.6
5
am
5.2
6
am
4.2
7
am
3.1
8
am
1.9
9
am
1.1
10
am
0.6
11
am
0.9
12
pm
1.7
1
pm
2.9
2
pm
4
3
pm
4.8
4
pm
5.2
5
pm
5
6
pm
4.3
7
pm
3.2
8
pm
2.1
9
pm
1.2
10
pm
0.7
11
pm
0.7

Tide / Current for Charleston Harbor Entrance, South Carolina Current
  
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Charleston Harbor Entrance
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Tue -- 12:28 AM EDT     1.29 knots Max Flood
Tue -- 03:32 AM EDT     Moonrise
Tue -- 04:04 AM EDT     -0.00 knots Slack
Tue -- 06:41 AM EDT     Sunrise
Tue -- 07:34 AM EDT     -1.94 knots Max Ebb
Tue -- 10:42 AM EDT     0.00 knots Slack
Tue -- 12:59 PM EDT     1.33 knots Max Flood
Tue -- 02:19 PM EDT     Moonset
Tue -- 04:20 PM EDT     -0.00 knots Slack
Tue -- 07:49 PM EDT     -1.74 knots Max Ebb
Tue -- 07:54 PM EDT     Sunset
Tue -- 10:54 PM EDT     0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
        
  Sorry, Charleston Harbor Entrance, South Carolina Current does not exist in database. Press Edit above and select a valid nearby location.

Charleston Harbor Entrance, South Carolina Current, knots
12
am
1.2
1
am
1.2
2
am
0.9
3
am
0.5
4
am
0.1
5
am
-0.7
6
am
-1.4
7
am
-1.9
8
am
-1.9
9
am
-1.4
10
am
-0.6
11
am
0.2
12
pm
1
1
pm
1.3
2
pm
1.1
3
pm
0.6
4
pm
0.2
5
pm
-0.5
6
pm
-1.2
7
pm
-1.6
8
pm
-1.7
9
pm
-1.4
10
pm
-0.7
11
pm
0.1

Area Discussion for Charleston, SC
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NOTE: mouseover dotted underlined text for definition
FXUS62 KCHS 221956 AFDCHS

Area Forecast Discussion National Weather Service Charleston SC 356 PM EDT Tue Apr 22 2025

SYNOPSIS
A cold front will slowly approach the region tonight, then become stationary over or near the area Wednesday into Thursday. A cold front will move through Saturday night or Sunday, with high pressure to build from the north early next week,

NEAR TERM /UNTIL 6 AM WEDNESDAY MORNING/
A large Atlantic high pressure continues to sit offshore and extend over southeastern SC and southeastern GA through the afternoon as southerly flow aloft remains. This strong ridging in place will begin to weaken this afternoon as a shortwave approaches from the west. Sea breeze has kicked off the coastline here, however the chance for any showers to develop along it remains minimal due to dry aloft. With an ample amount of sunshine today, temperatures were able to reach into the low to mid 80s.

Tonight: There is a chance for some showers to develop as this shortwave moves in, but if anything does develop, it will be very anti-climactic due to weak forcing and the onset of the nocturnal environment. Mentioned a chance of patchy fog and/or stratus developing just before sunrise (~09Z) as there will be calm winds and favorable condensation pressure deficits overnight. It looks to be another warm night with lows only dropping into the low to mid 60s (with it being a little warmer closer to the beaches).

SHORT TERM /6 AM WEDNESDAY MORNING THROUGH FRIDAY/
Wednesday: Ridging aloft slowly loosens its hold on the area, as perturbations pass in or near the local vicinity, causing a subtle fall of heights locally. This in turn allows for advection of greater moisture out of the Gulf within a deep southwest flow out of the Gulf. PWat will climb to around 1.8 inches by afternoon, with a considerable amount of deep moisture to prevail. At the surface, Atlantic high pressure pulls further offshore, as a cold front slips into closer vicinity of the area from the north. That front and the sea breeze will be the main focus for convection, that generally holds off until we reach our convective temperature in the lower and middle 80s around 1-2 PM. MUCAPE reaches around 1500-2500 J/kg, with its associated axis atop the local counties. While shear isn't that impressive, mainly around 25 or perhaps 30 kt, steep lapse rates will occur. These conditions will yield a sufficient amount of showers and t-storms. Right now we have scattered to numerous coverage, but higher coverage could be required as trends develop.
The greatest chances will be over the inland counties, and locally heavy rains will occur given weak storm motion and high water content. Unless conditions change, the heaviest rains will stay inland from Charleston, Beaufort, and Savannah. As dry as it has been, the grounds can certainly handle any heavy rains that occur.
Cold temperatures aloft (around minus 14 to minus 15C), WBZ around 10-11K feet, and strong updrafts, could generate some marginally severe hail. DCAPE of 900-1000 J/kg can also generate some strong to marginally severe winds where boundary interactions occur. These chances are mainly inland during the afternoon. Prior to convection, temperatures will peak in the mid and upper 80s away from the cooling effects of the sea breeze closer to the coast.

Wednesday night: Withe sea breeze far inland and the nocturnal stabilizing influences, convection looks to fade quickly, especially as any weak short waves aloft pass offshore. Low level moisture and convergence from off the ocean with a southeast synoptic flow could result in some showers moving in off the Atlantic at times.
Otherwise, the main concern could be the formation of fog where the grounds remain wet from earlier rains. Lows won't be too different from the previous night.

Thursday: Models differ on how much convection will occur. The front in the vicinity would suggest a greater than normal chance for showers and t-storms. But CAPE and shear are less than on Wednesday.
Plus moisture isn't as abundant, and much of the day looks like there is little forcing aloft. This would point toward less coverage than on Wednesday, so our forecast of scattered to numerous activity could be a bit on the high side. But since that forecast meshes with surrounding offices, we'll leave as is for now. Boundary interactions that lead to stronger updrafts could some some locally strong storms inland. Temperatures are a tough call, dependent on how much convection actually occurs. But even so, they will be above climo with 850 mb temperatures of 12-13C.

Friday: There is more of a cap in place and with the remnants of the front no longer in the picture, we don't expect as much activity.
But with sufficient instability and moisture, we are holding onto isolated or scattered PoPs. Temperatures are again above normal, especially with lower convective chances in play.

LONG TERM /FRIDAY NIGHT THROUGH TUESDAY/
A cold front will approach from the northwest Saturday, leading to at least a chance of showers and t-storms. The front pushes through at night or early Sunday, but lingers near or over our southern coutnies during the rest of Sunday, so we need to hold onto at least some low end chances during that time. High pressure will then prevail both surface and aloft early next week, with little or no chances of convection to occur given the large scale subsidence.
Compressional heating ahead of the front yields a very warm Saturday, with temperatures a bi more temperature thereafter behind the front.

AVIATION /20Z TUESDAY THROUGH SUNDAY/
22/18z TAF Discussion: KCHS/KJZI/KSAV: VFR conditions through tomorrow morning. Some low stratus and/or fog may develop across the region overnight into Wednesday morning, although confidence is too low to include flight restrictions at this juncture.

Extended Aviation Outlook: Although there will be be showers and thunderstorms Wednesday and Thursday afternoons, the higher chances look to stay further inland. Gusty winds are possible Friday and Saturday afternoon at all terminals with the passage of the sea breeze.

MARINE
Tonight: Southerly winds will remain across the coastal waters through tonight. The aforementioned sea breeze has already pushed inland, thus no enhancement of wind speeds were made. Seas will be from 2 to 3 ft.

Wednesday and Wednesday night: A stationary front will meander nearby, resulting in a prevailing onshore flow no more than 10 or 15 kt. Seas are just 2 or 3 feet. A few showers or t-storms can occur, but the greater coverage will be inland.

Thursday through Friday: Atlantic high pressure is in control, with not much wind or wave action, except some gustiness in Charleston harbor and near the coast Friday afternoon. There is little in the way of convection during this time.

Saturday through Sunday: High pressure will give way to a cold front that approaches form the northwest at night and early Sunday, before stalling nearby into Sunday night. High pressure builds in behind the front, perhaps even bridging across the front. Even so, this will result in stronger winds and building seas late in the forecast period. There is at least some chance for t-storms during this time.

CHS WATCHES/WARNINGS/ADVISORIES
GA...None.
SC...None.
MARINE...None.


Weather Reporting Stations
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Stations Dist Age Wind AirWater WavesinHgDewPt
CHTS1 16 mi58 minSSW 12G15 75°F 71°F30.09
ACXS1 - ACE Basin Reserve, SC 18 mi103 minS 1.9 76°F 30.0669°F
41066 24 mi80 minS 12G14 72°F 72°F30.0969°F
41076 24 mi53 min 2 ft
41033 27 mi80 minS 12G16 73°F30.08
41067 27 mi88 min 72°F2 ft
41029 - Capers Nearshore (CAP 2) 30 mi80 minSSW 14G18 72°F 71°F30.0767°F
41004 - EDISTO - 41 NM Southeast of Charleston, SC 54 mi48 minS 7.8G9.7 71°F 71°F30.1069°F


Wind History for Charleston, SC
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Airport Reports
   
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AirportDistAgeWind ktVisSkyWeatherAirDewPtRHinHg
KJZI CHARLESTON EXECUTIVE,SC 10 sm13 minSSW 0710 smClear75°F64°F69%30.09
KCHS CHARLESTON AFB/INTL,SC 22 sm32 minSSW 1310 smOvercast77°F61°F57%30.08

Weather Map
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GEOS Local Image of Southeast  
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Charleston, SC,





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