Charleston Harbor Marine Forecast
| Tonight...W Winds 5 To 10 Kt With Gusts To 25 Kt, Increasing To 10 To 15 Kt With Gusts To 30 Kt After Midnight. |
| Thu...W Winds 10 To 15 Kt. Gusts To 25 Kt In The Morning. |
| Thu Night...W Winds 5 Kt. |
| Fri...W Winds 5 To 10 Kt. |
| Fri Night...Sw Winds 5 To 10 Kt. A Chance Of Showers After Midnight. |
| Sat...Sw Winds 5 To 10 Kt. Showers Likely With A Slight Chance Of Tstms In The Morning, Then Showers With A Chance Of Tstms In The Afternoon. |
| Sat Night...Sw Winds 10 Kt, Becoming Nw After Midnight. Showers With A Slight Chance Of Tstms In The Evening, Then A Slight Chance Of Showers After Midnight. |
| Sun...N Winds 10 Kt. |
| Sun Night...Ne Winds 5 Kt. |
| Mon...Ne Winds 5 Kt. |
| Mon Night...Ne Winds 5 Kt. Winds And Waves Higher In And Near Tstms. Unless Otherwise Noted, Waves 1 Foot Or Less. Charleston Harbor Water Temperature 55 Degrees. |
| Area Forecast Discussion National Weather Service Charleston SC 607pm EST Wednesday Dec 31 2025 Synopsis High pressure will prevail through Friday. A low pressure system will move through on Saturday, followed by more high pressure next week. Near Term - Through Thursday Visible satellite shows a few patches of cirrus drifting across the southern Appalachians this afternoon. HREF simulated satellite indicates that some thin cirrus may reach the SC Lowcountry this evening, then clear conditions the rest of the night. At the sfc, the forecast area will remain between high pressure over FL as a trough remains centered along the Carolina escarpment. This pattern should yield steady west winds around 5 mph overnight. Given cool llevel thicknesses, light winds, and clear sky should result in below normal temperatures tonight. Using a blend of guidance, low temperatures are forecast to range around freeze along and west of I- 95 to the mid to upper 30s to the east. Lake Winds: Soundings support frequent gusts around 25 kt with sustained winds closer to 15-20 kt. A Lake Wind Advisory has been posted 10pm to 10am Thursday per coordination with WFO Columbia. Waves are expected to peak around 2 ft with the highest winds and the most significant wave action occurring over the central and eastern parts of the lake. .SHORT TERM /THURSDAY NIGHT THROUGH SATURDAY/... Thursday: Northwesterly flow will prevail in the mid-levels. At the surface, High pressure will prevail. While dry conditions should prevail, there could be a brief surge of westerly winds in the morning, that should ease into the afternoon. High temperatures will be near normal, generally around 60 degrees. At night, radiational cooling will cause temperatures to drop back into the mid 30s inland and up to the lower/mid 40s along the coast. Friday: Zonal flow will prevail in the mid-levels while High pressure prevails to our southeast. There will be a warm front located to our north with a system approaching from the distant west. This will cause clouds to increase during the day. Highs will still be in the lower to mid 60s. Overnight, POPs trend higher, especially further inland. But the Quantitative Precipitation Forecast will be highly dependent on the arrival timing, especially far inland. Regardless, lows will be mild, in the mid 40s to lower 50s. Saturday: Weak shortwaves will move over our area. Meanwhile, a low pressure system will also move over our area. Moisture will increase ahead of this system. Likewise, we're expecting widespread light to moderate rain showers. The exact Quantitative Precipitation Forecast is still somewhat uncertain a few days out. But it doesn't appear to be enough to cause major flooding concerns and it probably won't be enough to put a large dent in the ongoing drought. Despite the rain, temperatures will be in the lower to upper 60s. Long Term - Saturday Night Through Wednesday Mid-level northwesterly flow moves overhead while the storm system moves out. High pressure should then prevail through the middle of next week. High temperatures will start off a tick below normal Sunday and Monday, then creep back above normal Tuesday and Wednesday. Marine Tonight, the marine zones will remain between high pressure ridged across FL and a surface trough centered over the escarpment of the Carolinas. This pattern should yield a 4-5 mb pressure gradient across the Atlantic waters. West winds are forecast to strengthen this evening, with gusts between 25 to 30 kts. The GA nearshore waters may approach 25 kts during the pre-dawn hours, but should generally remain in the low 20s overnight. In addition, wave heigheights should gradually build overnight, reaching 3-5 ft by late tonight. Small Craft Advisories have been issued for the CHS Harbor, nearshore SC and outer GA waters from 11pm until 10 AM Thursday. Thursday and Friday: Winds and seas will be trending lower early Thursday morning, so any remaining Small Craft Advisories are expected to expire. High pressure will then prevail, bringing modest winds and seas later Thursday into Friday. Saturday and Sunday: A low pressure system will impact the coastal waters on Saturday, then move away on Sunday. At this time, the highest probabilities for Small Craft Criteria being met are for the GA waters beyond 20 nm. But based on the pattern, we wouldn't be surprised if Advisories are needed for all of the waters. This will be highly dependent on the strength and track of the system. NOAA Charleston SC Office: Watches - Warnings - Advisories GA...None. SC...Lake Wind Advisory from 10pm this evening to 10am EST Thursday for SCZ045. Marine Small Craft Advisory from 11pm this evening to 10am EST Thursday for AMZ330-350-352-374. |
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