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

Severe Thunderstorms and Heavy Rainfall for the Southwest; Heat Spreads Across the Center of the Nation

Moisture will continue to move into areas of the West. This will increase showers and thunderstorms coverage and intensity, with the risk of flash flooding and damaging wind gusts. Meanwhile, heat across the Southwest will expand into the center of the nation this weekend into early next week. Trends favor this heat will spread across the Ohio Valley, mid-Atlantic next week. Read More >

Hazardous Weather Conditions

Current conditions at

The Florida Keys - Marathon International Airport (KMTH)

Lat: 24.73°NLon: 81.05°WElev: 13ft.

Fair

88°F

31°C

Humidity 61%
Wind Speed Vrbl 5 mph
Barometer 30.04 in (1017.1 mb)
Dewpoint 73°F (23°C)
Visibility 10.00 mi
Heat Index96°F (36°C)
Last update 29 Aug 12:53 pm EDT
Extended Forecast for

Key Colony Beach FL

  • This Afternoon

    This Afternoon: A chance of showers and thunderstorms. Mostly sunny, with a high near 89. East wind around 10 mph. Chance of precipitation is 50%.

    High: 89 °F

    Chance
    T-storms

  • Tonight

    Tonight: A chance of showers and thunderstorms. Partly cloudy, with a low around 83. East wind around 10 mph. Chance of precipitation is 50%.

    Low: 83 °F

    Chance
    T-storms

  • Sunday

    Sunday: A chance of showers and thunderstorms. Mostly sunny, with a high near 89. Southeast wind 5 to 10 mph. Chance of precipitation is 50%.

    High: 89 °F

    Chance
    T-storms

  • Sunday Night

    Sunday Night: A chance of showers and thunderstorms. Partly cloudy, with a low around 83. East wind around 10 mph. Chance of precipitation is 40%.

    Low: 83 °F

    Chance
    T-storms

  • Monday

    Monday: A chance of showers and thunderstorms. Mostly sunny, with a high near 90. East wind around 5 mph. Chance of precipitation is 40%.

    High: 90 °F

    Chance
    T-storms

  • Monday Night

    Monday Night: A chance of showers and thunderstorms. Partly cloudy, with a low around 84. Chance of precipitation is 40%.

    Low: 84 °F

    Chance
    T-storms

  • Tuesday

    Tuesday: A chance of showers and thunderstorms. Mostly sunny, with a high near 89. Chance of precipitation is 50%.

    High: 89 °F

    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: Showers and thunderstorms likely. Partly cloudy, with a low around 83. Chance of precipitation is 60%.

    Low: 83 °F

    T-storms
    Likely

  • Wednesday

    Wednesday: Showers and thunderstorms likely. Mostly sunny, with a high near 89. Chance of precipitation is 70%.

    High: 89 °F

    T-storms
    Likely

Detailed Forecast

This Afternoon
A chance of showers and thunderstorms. Mostly sunny, with a high near 89. East wind around 10 mph. Chance of precipitation is 50%.
Tonight
A chance of showers and thunderstorms. Partly cloudy, with a low around 83. East wind around 10 mph. Chance of precipitation is 50%.
Sunday
A chance of showers and thunderstorms. Mostly sunny, with a high near 89. Southeast wind 5 to 10 mph. Chance of precipitation is 50%.
Sunday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 83. East wind around 10 mph. Chance of precipitation is 40%.
Monday
A chance of showers and thunderstorms. Mostly sunny, with a high near 90. East wind around 5 mph. Chance of precipitation is 40%.
Monday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 84. Chance of precipitation is 40%.
Tuesday
A chance of showers and thunderstorms. Mostly sunny, with a high near 89. Chance of precipitation is 50%.
Tuesday Night
Showers and thunderstorms likely. Partly cloudy, with a low around 83. Chance of precipitation is 60%.
Wednesday
Showers and thunderstorms likely. Mostly sunny, with a high near 89. Chance of precipitation is 70%.
Wednesday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 83. Chance of precipitation is 70%.
Thursday
Showers and thunderstorms likely. Partly sunny, with a high near 88. Chance of precipitation is 60%.
Thursday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 83. Chance of precipitation is 60%.
Friday
A chance of showers and thunderstorms. Mostly sunny, with a high near 88. Chance of precipitation is 50%.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Key Colony Beach FL
 24.71°N 81.02°W (Elev. 0 ft)
Last Update:
1:15 pm EDT Aug 29, 2026
Forecast Valid:
1pm EDT Aug 29, 2026-6pm EDT Sep 4, 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