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

The Florida Keys - Marathon International Airport (KMTH)

Lat: 24.73°NLon: 81.05°WElev: 13ft.

A Few Clouds

84°F

29°C

Humidity 74%
Wind Speed Vrbl 7 G 18 mph
Barometer 29.91 in (1012.9 mb)
Dewpoint 75°F (24°C)
Visibility 10.00 mi
Heat Index92°F (33°C)
Last update 2 May 12:53 pm EDT
Extended Forecast for

Key Colony Beach FL

  • This Afternoon

    This Afternoon: Sunny, with a high near 84. Southwest wind 10 to 15 mph.

    High: 84 °F

    Sunny

  • Tonight

    Tonight: A chance of showers and thunderstorms. Partly cloudy, with a low around 78. West wind around 5 mph becoming southwest after midnight. Chance of precipitation is 40%.

    Low: 78 °F

    Chance
    Showers

  • Sunday

    Sunday: A chance of showers and thunderstorms. Mostly cloudy, with a high near 83. West wind around 5 mph. Chance of precipitation is 50%.

    High: 83 °F

    Chance
    T-storms

  • Sunday Night

    Sunday Night: Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 75. North wind 5 to 10 mph. Chance of precipitation is 70%.

    Low: 75 °F

    Showers
    Likely

  • Monday

    Monday: A chance of showers and thunderstorms. Partly sunny, with a high near 82. North wind 5 to 10 mph. Chance of precipitation is 30%.

    High: 82 °F

    Chance
    Showers

  • Monday Night

    Monday Night: A chance of showers and thunderstorms. Partly cloudy, with a low around 76. Chance of precipitation is 30%.

    Low: 76 °F

    Chance
    Showers

  • Tuesday

    Tuesday: A slight chance of showers and thunderstorms. Mostly sunny, with a high near 83. Chance of precipitation is 10%.

    High: 83 °F

    Slight Chance
    T-storms

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 77.

    Low: 77 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 84.

    High: 84 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
Sunny, with a high near 84. Southwest wind 10 to 15 mph.
Tonight
A chance of showers and thunderstorms. Partly cloudy, with a low around 78. West wind around 5 mph becoming southwest after midnight. Chance of precipitation is 40%.
Sunday
A chance of showers and thunderstorms. Mostly cloudy, with a high near 83. West wind around 5 mph. Chance of precipitation is 50%.
Sunday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 75. North wind 5 to 10 mph. Chance of precipitation is 70%.
Monday
A chance of showers and thunderstorms. Partly sunny, with a high near 82. North wind 5 to 10 mph. Chance of precipitation is 30%.
Monday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 76. Chance of precipitation is 30%.
Tuesday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 83. Chance of precipitation is 10%.
Tuesday Night
Partly cloudy, with a low around 77.
Wednesday
Mostly sunny, with a high near 84.
Wednesday Night
Partly cloudy, with a low around 79.
Thursday
Mostly sunny, with a high near 84.
Thursday Night
Mostly clear, with a low around 78.
Friday
Mostly sunny, with a high near 84.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Key Colony Beach FL
 24.71°N 81.02°W (Elev. 0 ft)
Last Update:
12:15 pm EDT May 2, 2026
Forecast Valid:
1pm EDT May 2, 2026-6pm EDT May 8, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

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