Charleston Harbor Marine Forecast
| Tonight...Ne Winds 20 To 25 Kt, Diminishing To 15 To 20 Kt After Midnight. Waves 2 To 3 Ft. Showers With A Chance Of Tstms Until Early Morning, Then Showers Likely Late. |
| Sat...N Winds 15 To 20 Kt With Gusts To 30 Kt. Waves 1 To 2 Ft. Showers. |
| Sat Night...N Winds 15 To 20 Kt With Gusts To 30 Kt. Waves 1 To 2 Ft. Showers Likely, Mainly In The Evening. |
| Sun...N Winds 15 Kt With Gusts To 20 Kt. A Chance Of Showers. |
| Sun Night...N Winds 10 To 15 Kt. A Chance Of Showers, Mainly In The Evening. |
| Mon...Nw Winds 10 To 15 Kt. |
| Mon Night...N Winds 5 To 10 Kt. |
| Tue...N Winds 10 To 15 Kt. |
| Tue Night...N Winds 5 To 10 Kt. |
| Wed...N Winds 10 Kt. |
| Wed Night...N Winds 5 To 10 Kt. Winds And Waves Higher In And Near Tstms. Unless Otherwise Noted, Waves 1 Foot Or Less. Charleston Harbor Water Temperature 74 Degrees. |
| Area Forecast Discussion National Weather Service Charleston SC 355pm EDT Fri Oct 10 2025 Synopsis High pressure will prevail inland through early next week. Meanwhile, a coastal low will linger through Saturday before lifting north and eastward along the Atlantic coast. Near Term - Until 6am Saturday Morning This evening through tonight: Aloft, a mid-level low will continue to sink southward across the Southeast. This will place the forecast area within an area of difluence and within the entrance region of a developing upper jet. At the surface, an area of low pressure will develop along the east coast of FL and begin to slowly lift to the north-northeast. There will be a decent gradient of moisture across the area from west to east, with precipitable water values around 1.4 inches across inland southeast GA and around 1.8 inches along the coast. This combination of deep layered forcing and plentiful moisture will produce a wet evening and overnight, especially across the coastal corridor. Most of the rain will impact areas along and east of I-95, with lesser amounts and lesser coverage west of the I- 95 corridor. Locations along the coast will see rainfall amounts range from 0.5-1.5 inches, with some locally higher amounts possible along the immediate coast. Further inland, amounts will be mostly less than half an inch, with the inland- most counties potentially seeing very little measurable rainfall. Northeast winds will remain breezy through the period, with gusts as high as 20-25 mph just about everywhere, and gusts as high as 25-30 mph along the coast. The combination of widespread overcast cloud cover, light to moderate rain, and breezy northeast flow, will produce cool conditions. Lows will dip into the upper 50s for portions of the area. Lake Winds: Gusty northeast winds will continue across Lake Moultrie through tonight. Gusts will mostly be around 25 knots, but could be up to 30 knots at times. A Lake Wind Advisory remains in effect. Short Term - 6am Saturday Morning Through Monday This weather pattern will be dominated by a deep upper low over the southeast, along with the associated surface low over the Atlantic coastal waters. There will be a strong pressure gradient, especially closer to the coast, between the low pressure system offshore and a wedge of high pressure well inland. Gusty north-northeast winds early Saturday, are expected to back slightly to north-northwest later Saturday and beyond. As the surface low center slowly tracks northward up the coast, the pressure gradient and potential for gusty winds will also gradually decrease. Rain chances are expected to be highest over the Charleston Tri-County region through much of Saturday, then begin lowering Saturday night and Sunday. By Monday, our current forecast has no mentionable precipitation, with Probability of Precipitation below 15% all regions. Rainfall amounts generally 0.25 to 0.75 inches, with isolated higher amounts possible, with the highest amounts mainly over the northern 1/3 of the area, including the Charleston Tri- County region. Given clouds and northerly winds on the backside of the surface low over the Atlantic waters, high temperatures are expected to remain below normal in the upper 60s to mid 70s through Sunday, coolest over the northern half of the region. By Monday, temperatures expected to warm back to near normal in the mid 70s to around 80 by Monday. Lows closer to normal during the period, in the upper 50s to around 60 inland, and lower 60s near the coast. Long Term - Monday Night Through Friday A much quieter weather pattern is shown by models to develop during this period. The low pressure system off the mid Atlantic coast at the start of the period is expected to continue to moving northeastward away from the region as a deep layer ridge builds from the west. This will setup a relatively dry stretch, with no Probability of Precipitation in the forecast. In general, with the surface ridge expected to remain north of the area through the period, we expect light north to northeast winds, possibly becoming onshore near the coast each afternoon. High temperatures near to slightly below normal in the mid 70s to lower 80s. Low temperatures are expected to be slightly below normal in the mid 50s to lower 60s. Marine This evening and tonight: Very poor conditions will continue across the local waters through tonight. Winds will remain strong out of the northeast, with frequent gusts to gale force across the waters outside Charleston Harbor. Gale Warnings remain in effect, and strong Small Craft Advisory conditions are expected in Charleston Harbor with gusts as high as 30 knots. Seas across the nearshore waters should be in the 5-9 ft range, with 8-11 ft in the outer waters. A strong low pressure center over the nearshore Atlantic waters is expected to slowly move north-northeastward through the weekend. Expect hazardous marine conditions to continue through late Saturday night, with low end Gale conditions. Winds and seas gradually improve by Sunday. However, at least SCA (Small Craft Advisory) conditions will persist for seas through Sunday night for all waters, with offshore GA waters likely persisting through Sunday night. Monday through Wednesday, high pressure builds from the northwest, with conditions expected to fall below all highlight levels. However, still expect north- northeast winds to be 15 to 20 knots with seas 3 to 5 feet. Rip Currents Strong northeast winds and building seas will continue to support a High Risk of rip currents at all beaches through Sunday. High Surf: Large breaking waves of 5+ feet are expected at all area beaches today through Saturday as strong high pressure builds inland and low pressure develops offshore. A High Surf Advisory is in effect for the entire coastline. This in addition to very high tide cycles will likely lead to some erosion at area beaches. Tides / Coastal Flooding Charleston Harbor Tide Gage: The midday Saturday high tide cycle has the potential to hit major coastal flooding (8 ft MLLW). Though astronomical tide levels are starting to fall with each tide cycle, persistent and strong northeast winds will keep large tidal departures going. The Saturday midday astronomical high tide is 6.71 ft MLLW, but we could still be close to the 1.3 ft of tide departure needed. The current tide forecast is for 7.9 ft MLLW, but could reach the major coastal flood threshold of 8 ft MLLW. Fort Pulaski Tide Gage: The midday Saturday high tide cycle has the potential to hit moderate coastal flooding (10 ft MLLW). The astronomical tide level will come down to 8.58 ft MLLW, but persistent and strong northeast winds will maintain large tidal departures. The current tide forecast is for 9.8 ft MLLW, but could end up a bit higher and hit the moderate coastal flood threshold of 10 ft MLLW. NOAA Charleston SC Office: Watches - Warnings - Advisories GA...High Risk for Rip Currents through Saturday evening for GAZ117-119- 139-141. High Surf Advisory until 8am EDT Sunday for GAZ117-119-139- 141. SC...High Risk for Rip Currents through Saturday evening for SCZ048>051. High Surf Advisory until 8am EDT Sunday for SCZ048>051. Lake Wind Advisory until 2pm EDT Saturday for SCZ045. Marine Small Craft Advisory until 6am EDT Sunday for AMZ330. Gale Warning until 11pm EDT Saturday for AMZ350-352. Gale Warning until 8pm EDT Saturday for AMZ354. Gale Warning until 2am EDT Sunday for AMZ374. |
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