Thunderstorms and Heavy Rain in the Mid-South; Heat Continues in the Southeast and Southwest

Severe thunderstorms and heavy rain are expected across portions of the mid-Mississippi Valley into the Ohio Valley and portions of Arizona. Dangerous heat persists in the South and Southeast while building into the Southwest. Overnight lows will be so warm that, when combined with oppressive dew points, little-to-no relief from the scorching daytime highs will be available. Read More >

Current conditions at

The Florida Keys - Marathon International Airport (KMTH)

Lat: 24.73°NLon: 81.05°WElev: 13ft.

Fair

86°F

30°C

Humidity 70%
Wind Speed NW 6 mph
Barometer 30.05 in (1017.7 mb)
Dewpoint 75°F (24°C)
Visibility 10.00 mi
Heat Index95°F (35°C)
Last update 18 Aug 11:53 pm EDT
Extended Forecast for

Key Colony Beach FL

  • Overnight

    Overnight: Mostly clear, with a low around 83. Northwest wind around 10 mph.

    Low: 83 °F

    Mostly Clear

  • Wednesday

    Wednesday: Mostly sunny, with a high near 90. North wind around 10 mph.

    High: 90 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: A slight chance of showers and thunderstorms.  Partly cloudy, with a low around 83. Northwest wind 5 to 10 mph.  Chance of precipitation is 20%.

    Low: 83 °F

    Slight Chance
    T-storms

  • Thursday

    Thursday: Mostly sunny, with a high near 89. Southwest wind around 5 mph.

    High: 89 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 83. West wind 5 to 10 mph becoming south after midnight.

    Low: 83 °F

    Mostly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 89.

    High: 89 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 83.

    Low: 83 °F

    Partly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 90.

    High: 90 °F

    Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 83.

    Low: 83 °F

    Partly Cloudy

Detailed Forecast

Overnight
Mostly clear, with a low around 83. Northwest wind around 10 mph.
Wednesday
Mostly sunny, with a high near 90. North wind around 10 mph.
Wednesday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 83. Northwest wind 5 to 10 mph. Chance of precipitation is 20%.
Thursday
Mostly sunny, with a high near 89. Southwest wind around 5 mph.
Thursday Night
Mostly cloudy, with a low around 83. West wind 5 to 10 mph becoming south after midnight.
Friday
Mostly sunny, with a high near 89.
Friday Night
Partly cloudy, with a low around 83.
Saturday
Sunny, with a high near 90.
Saturday Night
Partly cloudy, with a low around 83.
Sunday
Sunny, with a high near 89.
Sunday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 83. Chance of precipitation is 20%.
Monday
Sunny, with a high near 90.
Monday Night
A chance of showers and thunderstorms. Mostly clear, with a low around 83. Chance of precipitation is 30%.
Tuesday
Sunny, with a high near 90.
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ABOUT THIS FORECAST

 
Point Forecast:
Key Colony Beach FL
 24.71°N 81.02°W (Elev. 0 ft)
12:17 am EDT Aug 19, 2026
12am EDT Aug 19, 2026-6pm EDT Aug 25, 2026
 
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Additional Resources

Radar & Satellite Image

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Hourly Weather Forecast

National Digital Forecast Database