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.

Partly Cloudy

77°F

25°C

Humidity 88%
Wind Speed E 3 mph
Barometer 29.97 in (1014.8 mb)
Dewpoint 73°F (23°C)
Visibility 10.00 mi
Heat Index78°F (26°C)
Last update 19 Apr 5:53 am EDT
Extended Forecast for

Key Colony Beach FL

  • Today

    Today: A slight chance of showers before 8am. Mostly sunny, with a high near 81. East wind around 5 mph. Chance of precipitation is 10%.

    High: 81 °F

    Slight Chance
    Showers then
    Mostly Sunny

  • Tonight

    Tonight: Mostly cloudy, with a low around 75. North wind around 5 mph.

    Low: 75 °F

    Mostly Cloudy

  • Monday

    Monday: A slight chance of showers. Mostly sunny, with a high near 81. North wind around 5 mph. 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. 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: Mostly clear, with a low around 71. Windy.

    Low: 71 °F

    Mostly Clear
    and Windy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 77.

    High: 77 °F

    Mostly Sunny

  • 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

  • Thursday

    Thursday: Partly sunny, with a high near 77.

    High: 77 °F

    Partly Sunny

Detailed Forecast

Today
A slight chance of showers before 8am. Mostly sunny, with a high near 81. East wind around 5 mph. Chance of precipitation is 10%.
Tonight
Mostly cloudy, with a low around 75. North wind around 5 mph.
Monday
A slight chance of showers. Mostly sunny, with a high near 81. North wind around 5 mph. 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. Breezy, with a northeast wind around 20 mph. Chance of precipitation is 10%.
Tuesday Night
Mostly clear, with a low around 71. Windy.
Wednesday
Mostly sunny, with a high near 77.
Wednesday Night
A slight chance of showers. Mostly cloudy, with a low around 71. Breezy. Chance of precipitation is 10%.
Thursday
Partly sunny, with a high near 77.
Thursday Night
A slight chance of showers. Partly cloudy, with a low around 72. Chance of precipitation is 10%.
Friday
Mostly sunny, with a high near 78.
Friday Night
Partly cloudy, with a low around 74.
Saturday
Mostly sunny, with a high near 79.
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Forecast Area
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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 19, 2026
Forecast Valid:
6am EDT Apr 19, 2026-6pm EDT Apr 25, 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