Marine forecast
Charleston Harbor, SC
- current wind
- 4 kt SSE
- Gusts
- 7 kt
- Air
- 80°F
- Water
- 78°F
- 72-hr peak
- 10 kt
Observed Tue 3:00 PM | AMZ340
- Gusts now
- 7 kt
- Air
- 80°F
- Water
- 78°F
- 72-hr peak
- 10 kt
In brief
At 3:00 pm EDT on Oct 13, 2026, NDBC station CHTS1 (Charleston, Cooper River Entrance, SC, 1 miles away) measured wind from the SSE at 4 kt, gusting to 7 kt. The NWS forecast for Charleston Harbor, SC issued at 2:19 pm EDT on Oct 13, 2026 reads, for this afternoon: “SE winds 5 kt.”
Source: National Weather Service Charleston SC forecast; NDBC observations
Wind forecast · ktPeak 10 kt
NWS marine forecast
| Period | Forecast |
|---|---|
| This Afternoon | SE winds 5 kt. |
| Tonight | SW winds 5 kt. |
| Wed | Variable winds 5 kt. |
| Wed Night | SW winds 5 kt. |
| Thu | SW winds 5 kt. |
| Thu Night | SW winds 5 kt. |
| Fri | SW winds 5 to 10 kt. |
| Fri Night | W winds 15 to 20 kt. Waves 1 to 2 ft. |
| Sat | N winds 15 to 20 kt. Waves 1 to 2 ft. |
| Sat Night | NE winds 15 kt. Unless otherwise noted, waves 1 foot or less. Charleston Harbor water temperature 76 degrees. |
Issued Tue 2:19 PM by Charleston SC (product CWFCHS).
Recent buoy conditions
| Time | Wind | Gust | Seas | Water |
|---|---|---|---|---|
| Tue 3:00 PM | 4 kt SSE | 7 kt | — | 78°F |
| Tue 2:54 PM | 6 kt SE | 6 kt | — | 77°F |
| Tue 1:54 PM | 2 kt S | 4 kt | — | 77°F |
| Tue 12:54 PM | 2 kt ENE | 3 kt | — | 76°F |
| Tue 11:54 AM | 4 kt NE | 4 kt | — | 76°F |
| Tue 10:54 AM | 6 kt NNE | 7 kt | — | 76°F |
| Tue 9:54 AM | 6 kt N | 8 kt | — | 76°F |
| Tue 8:54 AM | 7 kt N | 10 kt | — | 76°F |
| Tue 7:54 AM | 6 kt N | 9 kt | — | 76°F |
| Tue 6:54 AM | 4 kt NNW | 5 kt | — | 76°F |
| Tue 5:54 AM | 5 kt N | 6 kt | — | 76°F |
| Tue 4:54 AM | 4 kt N | 6 kt | — | 76°F |
Observed Tue 3:00 PM at NDBC buoy CHTS1 (Charleston, Cooper River Entrance, SC), 1.3 miles away.
Frequently asked questions
What is the marine forecast for Charleston Harbor today?
This Afternoon: SE winds 5 kt.
Is there a small craft advisory for Charleston Harbor?
No advisories, warnings or watches are in effect for NWS zone AMZ340 as of the last update on this page. Advisories can be issued at any time; check the current bulletin before leaving the dock.
What is the water temperature at Charleston Harbor?
The nearest buoy read 78°F (26°C) at Tue 3:00 PM. Sea surface temperature at a single buoy can differ by several degrees from the water at a beach or in a shallow bay nearby.
What do the wind speeds in knots mean?
One knot is 1.15 mph. The National Weather Service issues a small craft advisory for sustained winds of roughly 22–33 knots or hazardous seas, a gale warning at 34–47 knots, and a storm warning at 48 knots and above. Exact advisory thresholds vary by forecast office and by water body — a bay reaches dangerous chop at a lower wind speed than open ocean.
Where does this forecast come from?
The forecast text is the National Weather Service's own marine bulletin for zone AMZ340, issued by Charleston SC, reproduced in full. The wind and seas charts are drawn from the NWS gridded forecast for a point inside the zone. Observations come from the nearest reporting NDBC buoy. We are not affiliated with NOAA or the National Weather Service.
Forecast: NOAA/NWS product CWFCHS, issued Tue 2:19 PM. Observations: NOAA National Data Buoy Center station CHTS1, read Tue 3:00 PM. Retrieved Oct 13, 3:42 PM. Conditions offshore change faster than any page can be rebuilt, so check the current NWS bulletin and your own instruments before going out.