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 82%
Wind Speed E 10 mph
Barometer 29.95 in (1014.2 mb)
Dewpoint 72°F (22°C)
Visibility 10.00 mi
Heat Index80°F (27°C)
Last update 18 Apr 8:53 pm EDT
Extended Forecast for

Key Colony Beach FL

  • Tonight

    Tonight: A slight chance of showers. Mostly cloudy, with a low around 75. East wind around 10 mph. Chance of precipitation is 10%.

    Low: 75 °F

    Slight Chance
    Showers

  • Sunday

    Sunday: Partly sunny, with a high near 81. East wind around 5 mph.

    High: 81 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: A slight chance of showers. Mostly cloudy, with a low around 74. North wind around 5 mph. Chance of precipitation is 10%.

    Low: 74 °F

    Slight Chance
    Showers

  • Monday

    Monday: A slight chance of showers. Partly sunny, with a high near 81. North wind around 5 mph becoming east in the afternoon. Chance of precipitation is 20%.

    High: 81 °F

    Slight Chance
    Showers

  • Monday Night

    Monday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 72. Breezy, with a northeast wind 15 to 20 mph. Chance of precipitation is 30%.

    Low: 72 °F

    Chance
    Showers and
    Breezy

  • Tuesday

    Tuesday: A slight chance of showers. Mostly sunny, with a high near 77. Windy. Chance of precipitation is 20%.

    High: 77 °F

    Slight Chance
    Showers and
    Windy

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 71. Windy.

    Low: 71 °F

    Mostly Clear
    and Windy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 77. Windy.

    High: 77 °F

    Mostly Sunny
    and Windy

  • Wednesday Night

    Wednesday Night: A slight chance of showers. Mostly cloudy, with a low around 71. Breezy. Chance of precipitation is 10%.

    Low: 71 °F

    Slight Chance
    Showers and
    Breezy

Detailed Forecast

Tonight
A slight chance of showers. Mostly cloudy, with a low around 75. East wind around 10 mph. Chance of precipitation is 10%.
Sunday
Partly sunny, with a high near 81. East wind around 5 mph.
Sunday Night
A slight chance of showers. Mostly cloudy, with a low around 74. North wind around 5 mph. Chance of precipitation is 10%.
Monday
A slight chance of showers. Partly sunny, with a high near 81. North wind around 5 mph becoming east in the afternoon. Chance of precipitation is 20%.
Monday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 72. Breezy, with a northeast wind 15 to 20 mph. Chance of precipitation is 30%.
Tuesday
A slight chance of showers. Mostly sunny, with a high near 77. Windy. Chance of precipitation is 20%.
Tuesday Night
Mostly clear, with a low around 71. Windy.
Wednesday
Mostly sunny, with a high near 77. Windy.
Wednesday Night
A slight chance of showers. Mostly cloudy, with a low around 71. Breezy. Chance of precipitation is 10%.
Thursday
A slight chance of showers. Partly sunny, with a high near 77. Chance of precipitation is 10%.
Thursday Night
A slight chance of showers. Partly cloudy, with a low around 73. Chance of precipitation is 10%.
Friday
Mostly sunny, with a high near 78.
Friday Night
Mostly clear, with a low around 74.
Saturday
Sunny, with a high near 79.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Key Colony Beach FL
 24.74°N 81.02°W (Elev. 0 ft)
Last Update:
8:15 pm EDT Apr 18, 2026
Forecast Valid:
9pm EDT Apr 18, 2026-6pm EDT Apr 25, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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