Charleston Harbor Marine Forecast
| Rest Of Tonight...Nw Winds 5 Kt, Becoming N 10 To 15 Kt With Gusts To 20 Kt Late. A Chance Of Showers, Then A Slight Chance Of Showers Late. |
| Mon...Ne Winds 10 To 15 Kt With Gusts To 25 Kt. |
| Mon Night...Ne Winds 5 To 10 Kt. |
| Tue...Ne Winds 10 To 15 Kt With Gusts To 20 Kt. |
| Tue Night...Ne Winds 10 To 15 Kt With Gusts To 20 Kt, Increasing To 15 To 20 Kt With Gusts To 30 Kt After Midnight. Waves 1 To 2 Ft. |
| Wed...Ne Winds 20 To 25 Kt With Gusts To 35 Kt. Waves 2 To 3 Ft. A Slight Chance Of Showers In The Afternoon. |
| Wed Night...Ne Winds 15 To 20 Kt With Gusts To 30 Kt. Waves 1 To 2 Ft. A Slight Chance Of Showers. |
| Thu...Ne Winds 15 To 20 Kt. Waves 1 To 2 Ft. A Chance Of Showers. |
| Thu Night...Ne Winds 10 To 15 Kt. A Slight Chance Of Showers. |
| Fri...Ne Winds 10 Kt. |
| Fri Night...Ne Winds 5 To 10 Kt. Unless Otherwise Noted, Waves 1 Foot Or Less. Charleston Harbor Water Temperature 68 Degrees. |
| Area Forecast Discussion National Weather Service Charleston SC 218am EDT Monday April 6 2026 .WHAT HAS CHANGED... Key Message 1 now addresses the elevated fire risk this afternoon through mid-week. The Aviation Section has been waters outside of the Charleston Harbor from Tuesday night through Wednesday night. A Small Craft Advisory is also now in effect for the Charleston Harbor from Tuesday night through Wednesday night. .KEY MESSAGES... - 1) High pressure will build into the SC Lowcountry and SE GA from the north today and remain through mid-week. This set-up will yield dry and cooler conditions, along with an elevated fire risk. KEY MESSAGE 1: High pressure will build into the SC Lowcountry and SE GA from the north today and remain through mid-week. This set- up will yield dry and cooler conditions, along with an elevated fire risk. A wedge of high pressure will set up along the eastern side of the Appalachian Mountains today, resulting in a cold air damming (CAD) regime across the local area. Cooler temperatures are expected today, with highs only reaching into the upper 60s to around 70. With the building high pressure, wind gusts out of the northeast will be around 20 mph through most of the day, diminishing in the evening. Strong mixing will occur due to the gusty NE winds, allowing dew points to drop into the mid 30s far inland. These values will yield RH values 25-30% across areas west of I-95. A brief respite from building high pressure will occur Monday night, with another CAD regime setting up Tuesday into Wednesday. This high pressure is forecast to be stronger than the initial high pressure on Monday. Northeast gusts Tuesday and Wednesday afternoons are forecast to reach 20-25 mph on Tuesday, with gusts to 30 mph possible on Wednesday. RH values are forecast to be 25-30% west of I- 95. These conditions are hazardous for fire weather and a Fire Danger Statement or even a Fire Weather Watch/Red Flag Warning may be required for portions of the forecast area both Tuesday and Wednesday. Marine Today: A surge in winds is expected to develop into the morning hours as a surface high pressure dives down towards the Gulf Coast, creating sustained winds in the 20-25 knot range out of the northeast with gusts to 30 knots. Waves will rise to the 3-4 ft range along the coast to 7+ ft in the offshore Georgia waters, with winds briefly subsiding this evening. Tuesday through Friday: As a stronger surface high pressure moves across the Great Lakes region Tuesday, the surface pressure gradient again tightens leading to sustained winds in the 20-25 knot range with gusts to 30 into the morning hours on Tuesday. A high pressure wedge sets up along the northeast coast on Wednesday, and will lead to an increasingly pinched gradient where A Gale Watch has been issued for all waters off the coast, and a Small Craft Advisory issued for the Charleston Harbor. Wave heigheights on Wednesday just offshore look to be in the 7 to 8 ft range, possibly exceeding 15 feet in the offshore Georgia zone 60nm off the coast. Gale conditions subside overnight into Thursday, though breezy NE winds continue into Friday before decreasing below Small Craft Criteria threshold with unsettled seas lingering into early Saturday. Rip Currents Increase NE winds and building swells will result in a moderate risk for rip currents along all areas beaches today and Tuesday. The rip current risk will remain elevated for the rest of the upcoming week. High Surf: High surf and beach erosion could impact the beaches Wednesday through Friday as seas build 8+ feet over the coastal waters. High Surf Advisories may be needed. NOAA Charleston SC Office: Watches - Warnings - Advisories GA...None. SC...None. Marine Small Craft Advisory from 2am Wednesday to 2am EDT Thursday for AMZ330. Small Craft Advisory until 2am EDT Wednesday for AMZ350-352. Gale Watch from late Tuesday night through late Wednesday night for AMZ350-352-354-374. Small Craft Advisory from 8am this morning to 2am EDT Wednesday for AMZ354-374. |
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