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Charleston, SC Local Forecast Office

21NM NNE Altamaha Sound FL

Marine Point Forecast

[NOTICE]
    • Tonight

      Tonight:SW wind 20 to 23 km/h decreasing to 16 to 19 km/h after midnight. A slight chance of showers and thunderstorms before 10pm.   Seas around 1 m.

      SW 23km/h⇓
      1m

    • Monday

      Monday:SW wind 13 to 18 km/h becoming S 19 to 24 km/h in the afternoon. A slight chance of showers and thunderstorms after 2pm.   Seas around 1 m.

      ⇑S 24km/h
      1m

    • Monday Night

      Monday Night:SSW wind 24 to 29 km/h decreasing to 14 to 19 km/h. A slight chance of showers and thunderstorms before 8pm.   Seas around 1 m.

      SSW 29km/h⇓
      1m

    • Tuesday

      Tuesday:WSW wind 11 to 14 km/h becoming S 15 to 18 km/h in the afternoon. A chance of showers and thunderstorms after 2pm.   Seas around 1 m.

      ⇑S 18km/h
      1m

    • Tuesday Night

      Tuesday Night:SSW wind 14 to 18 km/h. A chance of showers and thunderstorms, mainly before 8pm.   Seas around 1 m.

      SSW 18km/h
      1m

    • Wednesday

      Wednesday:SW wind 11 to 16 km/h becoming S 16 to 21 km/h in the afternoon. A slight chance of showers, then a chance of showers and thunderstorms after 11am.   Seas around 1 m.

      ⇑S 21km/h
      1m

    • Wednesday Night

      Wednesday Night:SSW wind 20 to 23 km/h decreasing to 16 to 19 km/h after midnight. A chance of showers and thunderstorms, mainly before 8pm.   Seas around 1 m.

      SSW 23km/h⇓
      1m

    • Thursday

      Thursday:SW wind 13 to 18 km/h becoming S 18 to 23 km/h in the afternoon. A chance of showers and thunderstorms, mainly after 2pm.   Seas around 1 m.

      ⇑S 23km/h
      1m

    • Thursday Night

      Thursday Night:S wind 20 to 23 km/h becoming SW 14 to 17 km/h after midnight. A chance of showers and thunderstorms before 2am.   Seas around 1 m.

      S 23km/h⇓
      1m


Associated Zone Forecast which includes this point

Last Update: 7:40 pm EDT Jul 6, 2025
Forecast Valid: 9pm EDT Jul 6, 2025-6pm EDT Jul 13, 2025

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Detailed Forecast


Tonight
SW wind 20 to 23 km/h decreasing to 16 to 19 km/h after midnight. A slight chance of showers and thunderstorms before 10pm. Seas around 1 m.
Monday
SW wind 13 to 18 km/h becoming S 19 to 24 km/h in the afternoon. A slight chance of showers and thunderstorms after 2pm. Seas around 1 m.
Monday Night
SSW wind 24 to 29 km/h decreasing to 14 to 19 km/h. A slight chance of showers and thunderstorms before 8pm. Seas around 1 m.
Tuesday
WSW wind 11 to 14 km/h becoming S 15 to 18 km/h in the afternoon. A chance of showers and thunderstorms after 2pm. Seas around 1 m.
Tuesday Night
SSW wind 14 to 18 km/h. A chance of showers and thunderstorms, mainly before 8pm. Seas around 1 m.
Wednesday
SW wind 11 to 16 km/h becoming S 16 to 21 km/h in the afternoon. A slight chance of showers, then a chance of showers and thunderstorms after 11am. Seas around 1 m.
Wednesday Night
SSW wind 20 to 23 km/h decreasing to 16 to 19 km/h after midnight. A chance of showers and thunderstorms, mainly before 8pm. Seas around 1 m.
Thursday
SW wind 13 to 18 km/h becoming S 18 to 23 km/h in the afternoon. A chance of showers and thunderstorms, mainly after 2pm. Seas around 1 m.
Thursday Night
S wind 20 to 23 km/h becoming SW 14 to 17 km/h after midnight. A chance of showers and thunderstorms before 2am. Seas around 1 m.

Winds and seas higher in and near tstms.

*Notices:

  1. This forecast is for a single location. For safety concerns, mariners should be aware of the weather over a larger area. Forecast information for a larger area can be found within the zone forecast and the NDFD graphics.
  2. The forecast conditions at a particular point may not exceed the criteria of a Small Craft Advisory, Gale, Storm etc. These watches/warnings/advisories are issued for the entire zone in which the point resides and mariners should act accordingly.
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ABOUT THIS FORECAST

Point Forecast: 31.62°N 81.12°W
Last Update: 7:40 pm EDT Jul 6, 2025
Forecast Valid: 9pm EDT Jul 6, 2025-6pm EDT Jul 13, 2025
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