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Key Biscayne, FL Marine Weather Forecast

Overnight - 83°F
Jul 25, 2026
7 mph SE
Slight Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 83. Southeast wind around 7 mph. Chance of precipitation is 20%. New rainfall amounts between a quarter and half of an inch possible.
Saturday - 88°F
Jul 25, 2026
5 to 9 mph SE
Chance Showers And Thunderstorms
A chance of showers and thunderstorms. Mostly sunny, with a high near 88. Heat index values as high as 101. Southeast wind 5 to 9 mph. Chance of precipitation is 50%. New rainfall amounts between a quarter and half of an inch possible.
Saturday Night - 82°F
Jul 25, 2026
8 mph SW
Chance Showers And Thunderstorms
A chance of showers and thunderstorms. Partly cloudy, with a low around 82. Heat index values as high as 100. Southwest wind around 8 mph. Chance of precipitation is 50%. New rainfall amounts between a tenth and quarter of an inch possible.
Sunday - 89°F
Jul 26, 2026
6 to 10 mph SW
Showers And Thunderstorms Likely
Showers and thunderstorms likely after 7am. Mostly sunny, with a high near 89. Heat index values as high as 104. Southwest wind 6 to 10 mph. Chance of precipitation is 70%.
Sunday Night - 80°F
Jul 26, 2026
9 mph SW
Showers And Thunderstorms Likely
Showers and thunderstorms likely. Mostly cloudy, with a low around 80. Southwest wind around 9 mph. Chance of precipitation is 70%.
Monday - 88°F
Jul 27, 2026
6 to 12 mph SW
Showers And Thunderstorms Likely
Showers and thunderstorms likely before 5pm, then showers and thunderstorms likely. Partly sunny, with a high near 88. Southwest wind 6 to 12 mph. Chance of precipitation is 70%.
Monday Night - 81°F
Jul 27, 2026
12 mph SW
Showers And Thunderstorms Likely then Chance Showers And Thunderstorms
Showers and thunderstorms likely before 8pm, then a chance of showers and thunderstorms. Mostly cloudy, with a low around 81. Southwest wind around 12 mph. Chance of precipitation is 70%.
Tuesday - 88°F
Jul 28, 2026
9 to 15 mph SW
Showers And Thunderstorms Likely
Showers and thunderstorms likely. Partly sunny, with a high near 88. Southwest wind 9 to 15 mph, with gusts as high as 18 mph. Chance of precipitation is 70%.
Tuesday Night - 82°F
Jul 28, 2026
12 to 15 mph SW
Showers And Thunderstorms Likely then Partly Cloudy
Showers and thunderstorms likely before 8pm. Partly cloudy, with a low around 82. Southwest wind 12 to 15 mph, with gusts as high as 18 mph. Chance of precipitation is 70%.
Wednesday - 89°F
Jul 29, 2026
13 to 17 mph SW
Chance Showers And Thunderstorms
A chance of showers and thunderstorms after 8am. Mostly sunny, with a high near 89. Chance of precipitation is 40%.
Wednesday Night - 83°F
Jul 29, 2026
12 to 17 mph SW
Chance Showers And Thunderstorms then Partly Cloudy
A chance of showers and thunderstorms before 8pm. Partly cloudy, with a low around 83. Chance of precipitation is 40%.
Thursday - 90°F
Jul 30, 2026
12 to 15 mph SW
Mostly Sunny then Chance Showers And Thunderstorms
A chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 90. Chance of precipitation is 30%.
Thursday Night - 83°F
Jul 30, 2026
7 to 15 mph SW
Chance Showers And Thunderstorms then Partly Cloudy
A chance of showers and thunderstorms before 8pm. Partly cloudy, with a low around 83. Chance of precipitation is 30%.
Friday - 89°F
Jul 31, 2026
6 to 12 mph SW
Chance Showers And Thunderstorms
A chance of showers and thunderstorms after 8am. Mostly sunny, with a high near 89.

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