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Johns Island, FL - Chassahowitzka Bay Marine Weather Forecast

Today - 88°F
Jul 25, 2026
2 to 10 mph SW
Mostly Sunny then Isolated Showers And Thunderstorms
Isolated showers and thunderstorms between 3pm and 4pm. Mostly sunny, with a high near 88. Heat index values as high as 101. Southwest wind 2 to 10 mph. Chance of precipitation is 20%.
Tonight - 83°F
Jul 25, 2026
5 to 9 mph WNW
Partly Cloudy
Partly cloudy, with a low around 83. Heat index values as high as 101. West northwest wind 5 to 9 mph.
Sunday - 88°F
Jul 26, 2026
7 to 15 mph WNW
Isolated Showers And Thunderstorms
Isolated showers and thunderstorms between 8am and 3pm. Mostly sunny, with a high near 88. Heat index values as high as 102. West northwest wind 7 to 15 mph, with gusts as high as 20 mph. Chance of precipitation is 20%.
Sunday Night - 82°F
Jul 26, 2026
15 mph W
Scattered Showers And Thunderstorms
Scattered showers and thunderstorms between 7pm and 2am, then a chance of showers and thunderstorms. Mostly cloudy, with a low around 82. Heat index values as high as 101. West wind around 15 mph, with gusts as high as 18 mph. Chance of precipitation is 60%.
Monday - 88°F
Jul 27, 2026
14 mph W
Chance Showers And Thunderstorms
A chance of showers and thunderstorms before 2pm, then scattered showers and thunderstorms. Mostly sunny, with a high near 88. West wind around 14 mph, with gusts as high as 18 mph. Chance of precipitation is 60%.
Monday Night - 81°F
Jul 27, 2026
5 to 13 mph W
Scattered Showers And Thunderstorms
Scattered showers and thunderstorms. Partly cloudy, with a low around 81. West wind 5 to 13 mph. Chance of precipitation is 50%.
Tuesday - 88°F
Jul 28, 2026
5 to 14 mph W
Scattered Showers And Thunderstorms
Scattered showers and thunderstorms. Mostly sunny, with a high near 88. West wind 5 to 14 mph. Chance of precipitation is 40%.
Tuesday Night - 82°F
Jul 28, 2026
13 mph WSW
Scattered Showers And Thunderstorms
Scattered showers and thunderstorms. Partly cloudy, with a low around 82. West southwest wind around 13 mph, with gusts as high as 18 mph. Chance of precipitation is 30%.
Wednesday - 87°F
Jul 29, 2026
14 to 18 mph WSW
Scattered Showers And Thunderstorms
Scattered showers and thunderstorms. Mostly sunny, with a high near 87. West southwest wind 14 to 18 mph, with gusts as high as 25 mph. Chance of precipitation is 40%.
Wednesday Night - 81°F
Jul 29, 2026
18 mph WSW
Scattered Showers And Thunderstorms
Scattered showers and thunderstorms before 2am, then a chance of showers and thunderstorms. Partly cloudy, with a low around 81. Chance of precipitation is 70%.
Thursday - 86°F
Jul 30, 2026
18 to 24 mph WSW
Chance Showers And Thunderstorms
A chance of showers and thunderstorms before 8am, then a chance of showers and thunderstorms. Partly sunny, with a high near 86. Chance of precipitation is 70%.
Thursday Night - 80°F
Jul 30, 2026
16 to 21 mph WSW
Chance Showers And Thunderstorms
A chance of showers and thunderstorms before 2am, then a chance of showers and thunderstorms. Mostly cloudy, with a low around 80. Chance of precipitation is 70%.
Friday - 86°F
Jul 31, 2026
14 to 20 mph WSW
Chance Showers And Thunderstorms
A chance of showers and thunderstorms before 8am, then a chance of showers and thunderstorms. Partly sunny, with a high near 86. Chance of precipitation is 70%.
Friday Night - 80°F
Jul 31, 2026
10 to 16 mph WSW
Chance Showers And Thunderstorms
A chance of showers and thunderstorms before 8pm, then a chance of showers and thunderstorms between 8pm and 2am, then scattered showers and thunderstorms. Mostly cloudy, with a low around 80.

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