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.

Fair

78°F

26°C

Humidity 69%
Wind Speed Vrbl 5 mph
Barometer 29.99 in (1015.6 mb)
Dewpoint 67°F (19°C)
Visibility 10.00 mi
Heat Index80°F (27°C)
Last update 20 Apr 4:53 am EDT
Extended Forecast for

Key Colony Beach FL

  • Today

    Today: A chance of showers after 2pm. Mostly sunny, with a high near 81. North wind around 5 mph becoming east in the afternoon. Chance of precipitation is 30%.

    High: 81 °F

    Mostly Sunny
    then Chance
    Showers

  • Tonight

    Tonight: A chance of showers and thunderstorms. Mostly cloudy, with a low around 72. Northeast wind around 15 mph. Chance of precipitation is 40%.

    Low: 72 °F

    Chance
    Showers

  • Tuesday

    Tuesday: A slight chance of showers. Mostly sunny, with a high near 77. Breezy, with a northeast wind around 20 mph. Chance of precipitation is 10%.

    High: 77 °F

    Slight Chance
    Showers and
    Breezy

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 72. Breezy, with an east wind around 20 mph.

    Low: 72 °F

    Partly Cloudy
    and Breezy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 77. East wind around 15 mph.

    High: 77 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: A slight chance of showers. Mostly cloudy, with a low around 72. Chance of precipitation is 10%.

    Low: 72 °F

    Slight Chance
    Showers

  • Thursday

    Thursday: A slight chance of showers. Mostly cloudy, with a high near 77. Chance of precipitation is 10%.

    High: 77 °F

    Slight Chance
    Showers

  • Thursday Night

    Thursday Night: A slight chance of showers and thunderstorms. Mostly cloudy, with a low around 73. Chance of precipitation is 20%.

    Low: 73 °F

    Slight Chance
    T-storms

  • Friday

    Friday: A slight chance of showers. Partly sunny, with a high near 78. Chance of precipitation is 10%.

    High: 78 °F

    Slight Chance
    Showers

Detailed Forecast

Today
A chance of showers after 2pm. Mostly sunny, with a high near 81. North wind around 5 mph becoming east in the afternoon. Chance of precipitation is 30%.
Tonight
A chance of showers and thunderstorms. Mostly cloudy, with a low around 72. Northeast wind around 15 mph. Chance of precipitation is 40%.
Tuesday
A slight chance of showers. Mostly sunny, with a high near 77. Breezy, with a northeast wind around 20 mph. Chance of precipitation is 10%.
Tuesday Night
Partly cloudy, with a low around 72. Breezy, with an east wind around 20 mph.
Wednesday
Mostly sunny, with a high near 77. East wind around 15 mph.
Wednesday Night
A slight chance of showers. Mostly cloudy, with a low around 72. Chance of precipitation is 10%.
Thursday
A slight chance of showers. Mostly cloudy, with a high near 77. Chance of precipitation is 10%.
Thursday Night
A slight chance of showers and thunderstorms. Mostly cloudy, with a low around 73. Chance of precipitation is 20%.
Friday
A slight chance of showers. Partly sunny, with a high near 78. Chance of precipitation is 10%.
Friday Night
A slight chance of showers. Partly cloudy, with a low around 74. Chance of precipitation is 10%.
Saturday
Mostly sunny, with a high near 80.
Saturday Night
Mostly clear, with a low around 75.
Sunday
Sunny, with a high near 81.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Key Colony Beach FL
 24.74°N 81.02°W (Elev. 0 ft)
Last Update:
5:15 am EDT Apr 20, 2026
Forecast Valid:
5am EDT Apr 20, 2026-6pm EDT Apr 26, 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