National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
Current conditions at

Miami, Miami International Airport (KMIA)

Lat: 25.79°NLon: 80.32°WElev: 10ft.

Mostly Cloudy

78°F

26°C

Humidity 82%
Wind Speed Calm
Barometer 29.97 in (1014.7 mb)
Dewpoint 72°F (22°C)
Visibility 10.00 mi
Heat Index80°F (27°C)
Last update 19 Sep 9:53 pm EDT
Extended Forecast for

Key Biscayne FL

  • Tonight

    Tonight: A 50 percent chance of showers and thunderstorms, mainly after 3am. Partly cloudy, with a low around 79. North wind 3 to 5 mph. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 79 °F

    Chance
    T-storms

  • Sunday

    Sunday: Showers and thunderstorms likely, mainly after 3pm. Mostly sunny, with a high near 87. Light and variable wind becoming southeast around 6 mph in the afternoon. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 87 °F

    Chance
    T-storms then
    T-storms
    Likely

  • Sunday Night

    Sunday Night: Showers and thunderstorms likely, mainly before 10pm. Partly cloudy, with a low around 79. Southwest wind around 5 mph becoming light and variable. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 79 °F

    T-storms
    Likely

  • Monday

    Monday: Showers and possibly a thunderstorm. High near 87. Light and variable wind becoming south 5 to 7 mph in the afternoon. Chance of precipitation is 80%.

    High: 87 °F

    Showers
    Likely then
    T-storms

  • Monday Night

    Monday Night: Showers and possibly a thunderstorm. Low around 81. South wind around 7 mph. Chance of precipitation is 80%.

    Low: 81 °F

    Showers

  • Tuesday

    Tuesday: Showers likely and possibly a thunderstorm before 2pm, then showers and thunderstorms likely after 2pm. Partly sunny, with a high near 87. South wind 5 to 8 mph. Chance of precipitation is 70%.

    High: 87 °F

    Showers
    Likely then
    T-storms
    Likely

  • Tuesday Night

    Tuesday Night: Showers and thunderstorms likely before 8pm, then showers likely and possibly a thunderstorm after 8pm. Mostly cloudy, with a low around 81. South wind around 7 mph. Chance of precipitation is 70%.

    Low: 81 °F

    T-storms
    Likely then
    Showers
    Likely

  • Wednesday

    Wednesday: Showers and possibly a thunderstorm. High near 87. Southeast wind around 6 mph. Chance of precipitation is 90%.

    High: 87 °F

    Showers
    Likely then
    T-storms

  • Wednesday Night

    Wednesday Night: Showers and possibly a thunderstorm, mainly before 2am, then a chance of showers and thunderstorms after 2am. Low around 80. South wind around 6 mph. Chance of precipitation is 80%.

    Low: 80 °F

    T-storms then
    Showers
    Likely

Detailed Forecast

Tonight
A 50 percent chance of showers and thunderstorms, mainly after 3am. Partly cloudy, with a low around 79. North wind 3 to 5 mph. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Sunday
Showers and thunderstorms likely, mainly after 3pm. Mostly sunny, with a high near 87. Light and variable wind becoming southeast around 6 mph in the afternoon. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Sunday Night
Showers and thunderstorms likely, mainly before 10pm. Partly cloudy, with a low around 79. Southwest wind around 5 mph becoming light and variable. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Monday
Showers and possibly a thunderstorm. High near 87. Light and variable wind becoming south 5 to 7 mph in the afternoon. Chance of precipitation is 80%.
Monday Night
Showers and possibly a thunderstorm. Low around 81. South wind around 7 mph. Chance of precipitation is 80%.
Tuesday
Showers likely and possibly a thunderstorm before 2pm, then showers and thunderstorms likely after 2pm. Partly sunny, with a high near 87. South wind 5 to 8 mph. Chance of precipitation is 70%.
Tuesday Night
Showers and thunderstorms likely before 8pm, then showers likely and possibly a thunderstorm after 8pm. Mostly cloudy, with a low around 81. South wind around 7 mph. Chance of precipitation is 70%.
Wednesday
Showers and possibly a thunderstorm. High near 87. Southeast wind around 6 mph. Chance of precipitation is 90%.
Wednesday Night
Showers and possibly a thunderstorm, mainly before 2am, then a chance of showers and thunderstorms after 2am. Low around 80. South wind around 6 mph. Chance of precipitation is 80%.
Thursday
A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 8am. High near 87. Chance of precipitation is 80%.
Thursday Night
Showers and thunderstorms. Low around 80. Chance of precipitation is 80%.
Friday
Showers and thunderstorms likely. Mostly sunny, with a high near 87. Chance of precipitation is 70%.
Friday Night
Showers and thunderstorms likely. Partly cloudy, with a low around 79. Chance of precipitation is 60%.
Saturday
Showers and thunderstorms. High near 87. Chance of precipitation is 80%.
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ABOUT THIS FORECAST

 
Point Forecast:
Key Biscayne FL
 25.69°N 80.17°W
Last Update:
4:11 pm EDT Sep 19, 2026
Forecast Valid:
10pm EDT Sep 19, 2026-6pm EDT Sep 26, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation