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

87°F

31°C

Humidity 65%
Wind Speed W 7 mph
Barometer 30.01 in (1016.0 mb)
Dewpoint 74°F (23°C)
Visibility 10.00 mi
Heat Index95°F (35°C)
Last update 18 Aug 8:53 pm EDT
Extended Forecast for

Big Pine Key FL

  • Tonight

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

    Low: 83 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 93. North wind around 10 mph.

    High: 93 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 82. Northwest wind 10 to 15 mph.

    Low: 82 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 93. Calm wind becoming west around 5 mph in the afternoon.

    High: 93 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 82. West wind around 5 mph becoming southeast after midnight.

    Low: 82 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 93.

    High: 93 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 83.

    Low: 83 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 93.

    High: 93 °F

    Sunny

  • Saturday Night

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

    Low: 82 °F

    Slight Chance
    Showers

Detailed Forecast

Tonight
Partly cloudy, with a low around 83. Northwest wind around 10 mph.
Wednesday
Mostly sunny, with a high near 93. North wind around 10 mph.
Wednesday Night
Partly cloudy, with a low around 82. Northwest wind 10 to 15 mph.
Thursday
Mostly sunny, with a high near 93. Calm wind becoming west around 5 mph in the afternoon.
Thursday Night
Partly cloudy, with a low around 82. West wind around 5 mph becoming southeast after midnight.
Friday
Mostly sunny, with a high near 93.
Friday Night
Mostly clear, with a low around 83.
Saturday
Sunny, with a high near 93.
Saturday Night
A slight chance of showers. Partly cloudy, with a low around 82. Chance of precipitation is 10%.
Sunday
A slight chance of showers. Sunny, with a high near 93. Chance of precipitation is 10%.
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 93.
Monday Night
A slight chance of showers and thunderstorms. Mostly clear, with a low around 83. Chance of precipitation is 20%.
Tuesday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 93. Chance of precipitation is 20%.
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ABOUT THIS FORECAST

 
Point Forecast:
Big Pine Key FL
 24.68°N 81.35°W (Elev. 3 ft)
9:15 pm EDT Aug 18, 2026
9pm EDT Aug 18, 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