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

Severe Thunderstorms in the Midwest and Arizona; Heat Continues in the Southeast and Southwest

Thunderstorms, some severe, may lead to scattered instances of flash flooding across the Midwest and Ohio Valley and southern Arizona. The threat will shift to the Mid-Atlantic coast on Thursday. Dangerous heat persists in the South and Southeast while building into the Southwest. Overnight lows will be so warm that 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.

A Few Clouds

87°F

31°C

Humidity 72%
Wind Speed W 5 mph
Barometer 30.00 in (1016.0 mb)
Dewpoint 77°F (25°C)
Visibility 10.00 mi
Heat Index99°F (37°C)
Last update 19 Aug 9:53 pm EDT
Extended Forecast for

Big Pine Key FL

  • Tonight

    Tonight: Partly cloudy, with a low around 83. Northwest wind 5 to 10 mph.

    Low: 83 °F

    Partly Cloudy

  • Thursday

    Thursday: A slight chance of showers and thunderstorms. Mostly sunny, with a high near 93. Southwest wind around 5 mph. Chance of precipitation is 10%.

    High: 93 °F

    Slight Chance
    T-storms

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 82. Northwest wind 5 to 10 mph becoming southeast after midnight.

    Low: 82 °F

    Mostly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 93. South wind around 5 mph.

    High: 93 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 83. Light and variable wind becoming southeast 5 to 10 mph after midnight.

    Low: 83 °F

    Partly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 93.

    High: 93 °F

    Sunny

  • Saturday Night

    Saturday Night: A slight chance of showers. Mostly clear, with a low around 82. Chance of precipitation is 10%.

    Low: 82 °F

    Slight Chance
    Showers

  • Sunday

    Sunday: Sunny, with a high near 93.

    High: 93 °F

    Sunny

  • Sunday Night

    Sunday Night: A slight chance of showers and thunderstorms. Mostly clear, with a low around 83. Chance of precipitation is 20%.

    Low: 83 °F

    Slight Chance
    T-storms

Detailed Forecast

Tonight
Partly cloudy, with a low around 83. Northwest wind 5 to 10 mph.
Thursday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 93. Southwest wind around 5 mph. Chance of precipitation is 10%.
Thursday Night
Mostly cloudy, with a low around 82. Northwest wind 5 to 10 mph becoming southeast after midnight.
Friday
Mostly sunny, with a high near 93. South wind around 5 mph.
Friday Night
Partly cloudy, with a low around 83. Light and variable wind becoming southeast 5 to 10 mph after midnight.
Saturday
Sunny, with a high near 93.
Saturday Night
A slight chance of showers. Mostly clear, with a low around 82. Chance of precipitation is 10%.
Sunday
Sunny, with a high near 93.
Sunday Night
A slight chance of showers and thunderstorms. Mostly clear, with a low around 83. Chance of precipitation is 20%.
Monday
Sunny, with a high near 93.
Monday Night
A chance of showers and thunderstorms. Mostly clear, with a low around 83. Chance of precipitation is 30%.
Tuesday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 93. Chance of precipitation is 20%.
Tuesday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 82. Chance of precipitation is 40%.
Wednesday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 93. Chance of precipitation is 20%.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Big Pine Key FL
 24.68°N 81.35°W (Elev. 3 ft)
Last Update:
10:15 pm EDT Aug 19, 2026
Forecast Valid:
10pm EDT Aug 19, 2026-6pm EDT Aug 26, 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