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

Severe Thunderstorms, Heavy Rainfall and Dangerous Heat

Severe thunderstorms are expected today and Friday from the upper Midwest, central Great Lakes into the Ohio and mid-Mississippi Valley's. In addition, heavy rainfall threat increases on Friday across the Ohio Valley. Meanwhile, early summer-like heat wave across portions of southern Texas with new daily records are forecast today and through the weekend; The heat spreads across the Gulf States. Read More >

Current conditions at

The Florida Keys - Marathon International Airport (KMTH)

Lat: 24.73°NLon: 81.05°WElev: 13ft.

Fair

81°F

27°C

Humidity 72%
Wind Speed E 8 mph
Barometer 30.00 in (1016.0 mb)
Dewpoint 71°F (22°C)
Visibility 10.00 mi
Heat Index85°F (29°C)
Last update 15 May 9:53 pm EDT
Extended Forecast for

Key Colony Beach FL

  • Tonight

    Tonight: Mostly clear, with a steady temperature around 87. East wind 5 to 10 mph.

    Low: 87 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 88. East wind around 5 mph.

    High: 88 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a steady temperature around 87. East wind around 10 mph.

    Low: 87 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 88. Southeast wind 5 to 10 mph.

    High: 88 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 80. East wind around 10 mph.

    Low: 80 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 89.

    High: 89 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 80.

    Low: 80 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 88.

    High: 88 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 80.

    Low: 80 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly clear, with a steady temperature around 87. East wind 5 to 10 mph.
Friday
Sunny, with a high near 88. East wind around 5 mph.
Friday Night
Mostly clear, with a steady temperature around 87. East wind around 10 mph.
Saturday
Sunny, with a high near 88. Southeast wind 5 to 10 mph.
Saturday Night
Mostly clear, with a low around 80. East wind around 10 mph.
Sunday
Sunny, with a high near 89.
Sunday Night
Mostly clear, with a low around 80.
Monday
Sunny, with a high near 88.
Monday Night
Mostly clear, with a low around 80.
Tuesday
Sunny, with a high near 88.
Tuesday Night
Mostly clear, with a low around 80.
Wednesday
A slight chance of showers. Sunny, with a high near 85. Chance of precipitation is 10%.
Wednesday Night
A slight chance of showers. Mostly clear, with a low around 80. Chance of precipitation is 10%.
Thursday
Sunny, with a high near 86.
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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:
10:15 pm EDT May 15, 2025
Forecast Valid:
10pm EDT May 15, 2025-6pm EDT May 22, 2025
 
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