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Horn Island, MS - Mississippi Sound Marine Weather Forecast

Overnight - 82°F
Aug 18, 2026
15 mph W
Partly Cloudy
Partly cloudy. Low around 82, with temperatures rising to around 87 overnight. Heat index values as high as 108. West wind around 15 mph.
Tuesday - 91°F
Aug 18, 2026
10 to 15 mph W
Mostly Sunny then Slight Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 91. Heat index values as high as 109. West wind 10 to 15 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
Tuesday Night - 84°F
Aug 18, 2026
15 mph W
Slight Chance Showers And Thunderstorms then Mostly Cloudy
A slight chance of showers and thunderstorms before 11pm. Mostly cloudy. Low around 84, with temperatures rising to around 86 overnight. Heat index values as high as 109. West wind around 15 mph. Chance of precipitation is 20%. New rainfall amounts between a quarter and half of an inch possible.
Wednesday - 91°F
Aug 19, 2026
10 to 15 mph W
Mostly Sunny then Chance Showers And Thunderstorms
A chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 91. Heat index values as high as 109. West wind 10 to 15 mph. Chance of precipitation is 40%.
Wednesday Night - 83°F
Aug 19, 2026
10 to 15 mph W
Chance Showers And Thunderstorms
A chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 83. West wind 10 to 15 mph. Chance of precipitation is 40%.
Thursday - 91°F
Aug 20, 2026
10 mph W
Mostly Sunny then Slight Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 91. West wind around 10 mph. Chance of precipitation is 20%.
Thursday Night - 82°F
Aug 20, 2026
10 mph W
Slight Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 82. West wind around 10 mph. Chance of precipitation is 20%.
Friday - 90°F
Aug 21, 2026
5 to 10 mph W
Mostly Sunny then Chance Showers And Thunderstorms
A chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 90. West wind 5 to 10 mph.
Friday Night - 82°F
Aug 21, 2026
10 mph W
Chance Showers And Thunderstorms
A chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 82. West wind around 10 mph.
Saturday - 90°F
Aug 22, 2026
10 to 15 mph W
Mostly Sunny then Slight Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 90. West wind 10 to 15 mph.
Saturday Night - 82°F
Aug 22, 2026
10 to 15 mph W
Slight Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 82. West wind 10 to 15 mph.
Sunday - 91°F
Aug 23, 2026
5 to 15 mph W
Sunny
Sunny, with a high near 91. West wind 5 to 15 mph.
Sunday Night - 83°F
Aug 23, 2026
10 to 15 mph SW
Mostly Clear
Mostly clear, with a low around 83. Southwest wind 10 to 15 mph.
Monday - 90°F
Aug 24, 2026
5 to 10 mph W
Sunny then Slight Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms after 1pm. Sunny, with a high near 90. West wind 5 to 10 mph.

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