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St. Marks, FL - St. Marks River Marine Weather Forecast

Overnight - 33°F
Dec 15, 2025
15 mph NNE
Clear
Clear, with a low around 33. North northeast wind around 15 mph, with gusts as high as 25 mph.
Monday - 48°F
Dec 15, 2025
10 to 15 mph NE
Sunny
Sunny, with a high near 48. Northeast wind 10 to 15 mph.
Monday Night - 36°F
Dec 15, 2025
5 to 10 mph NE
Partly Cloudy
Partly cloudy, with a low around 36. Northeast wind 5 to 10 mph.
Tuesday - 59°F
Dec 16, 2025
0 to 5 mph NE
Sunny
Sunny, with a high near 59. Northeast wind 0 to 5 mph.
Tuesday Night - 47°F
Dec 16, 2025
0 to 5 mph NE
Partly Cloudy
Partly cloudy, with a low around 47. Northeast wind 0 to 5 mph.
Wednesday - 63°F
Dec 17, 2025
0 to 5 mph E
Mostly Cloudy
Mostly cloudy, with a high near 63.
Wednesday Night - 53°F
Dec 17, 2025
0 to 5 mph E
Mostly Cloudy
Mostly cloudy, with a low around 53.
Thursday - 66°F
Dec 18, 2025
5 to 10 mph SE
Partly Sunny then Chance Showers And Thunderstorms
A chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 66. Chance of precipitation is 30%.
Thursday Night - 57°F
Dec 18, 2025
5 mph SSW
Chance Showers And Thunderstorms
A chance of showers and thunderstorms. Mostly cloudy, with a low around 57. Chance of precipitation is 30%.
Friday - 66°F
Dec 19, 2025
5 mph NNW
Chance Showers And Thunderstorms then Mostly Sunny
A chance of showers and thunderstorms before 7am. Mostly sunny, with a high near 66. Chance of precipitation is 30%.
Friday Night - 49°F
Dec 19, 2025
5 mph NNE
Mostly Clear
Mostly clear, with a low around 49.
Saturday - 65°F
Dec 20, 2025
0 to 5 mph ESE
Mostly Sunny
Mostly sunny, with a high near 65.
Saturday Night - 54°F
Dec 20, 2025
0 mph
Partly Cloudy
Partly cloudy, with a low around 54.
Sunday - 68°F
Dec 21, 2025
0 to 5 mph SE
Mostly Sunny
Mostly sunny, with a high near 68.

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