Current conditions at

The Florida Keys - Marathon International Airport (KMTH)

Lat: 24.73°NLon: 81.05°WElev: 13ft.

A Few Clouds

88°F

31°C

Humidity 70%
Wind Speed SE 8 mph
Barometer 30.07 in (1018.1 mb)
Dewpoint 77°F (25°C)
Visibility 10.00 mi
Heat Index100°F (38°C)
Last update 11 Oct 1:53 pm EDT
Extended Forecast for

23 Miles NNW Long Key FL

  • This Afternoon

    This Afternoon: Sunny, with a high near 89. Heat index values as high as 102. Southeast wind around 8 mph.

    High: 89 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 76. East wind around 6 mph becoming north after midnight.

    Low: 76 °F

    Mostly Clear

  • Columbus Day

    Columbus Day: A 30 percent chance of showers and thunderstorms, mainly after 5pm.  Mostly sunny, with a high near 89. Heat index values as high as 100. Northeast wind around 7 mph.

    High: 89 °F

    Mostly Sunny
    then Chance
    T-storms

  • Monday Night

    Monday Night: A 30 percent chance of showers and thunderstorms before 8pm.  Mostly clear, with a low around 73. Northeast wind around 8 mph.

    Low: 73 °F

    Chance
    T-storms then
    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 88. North wind 7 to 10 mph.

    High: 88 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 73. Northeast wind 7 to 11 mph.

    Low: 73 °F

    Mostly Clear

  • Wednesday

    Wednesday: A 30 percent chance of showers and thunderstorms after 2pm.  Sunny, with a high near 87. North wind 8 to 10 mph becoming east in the afternoon.

    High: 87 °F

    Sunny then
    Chance
    Showers

  • Wednesday Night

    Wednesday Night: A 30 percent chance of showers and thunderstorms, mainly before 8pm.  Mostly clear, with a low around 77. Breezy, with an east wind 10 to 16 mph, with gusts as high as 20 mph.

    Low: 77 °F

    Chance
    Showers and
    Breezy then
    Slight Chance
    T-storms

  • Thursday

    Thursday: A 40 percent chance of showers and thunderstorms.  Sunny, with a high near 86. East wind 9 to 13 mph.

    High: 86 °F

    Chance
    Showers then
    Chance
    T-storms

Detailed Forecast

This Afternoon
Sunny, with a high near 89. Heat index values as high as 102. Southeast wind around 8 mph.
Tonight
Mostly clear, with a low around 76. East wind around 6 mph becoming north after midnight.
Columbus Day
A 30 percent chance of showers and thunderstorms, mainly after 5pm. Mostly sunny, with a high near 89. Heat index values as high as 100. Northeast wind around 7 mph.
Monday Night
A 30 percent chance of showers and thunderstorms before 8pm. Mostly clear, with a low around 73. Northeast wind around 8 mph.
Tuesday
Sunny, with a high near 88. North wind 7 to 10 mph.
Tuesday Night
Mostly clear, with a low around 73. Northeast wind 7 to 11 mph.
Wednesday
A 30 percent chance of showers and thunderstorms after 2pm. Sunny, with a high near 87. North wind 8 to 10 mph becoming east in the afternoon.
Wednesday Night
A 30 percent chance of showers and thunderstorms, mainly before 8pm. Mostly clear, with a low around 77. Breezy, with an east wind 10 to 16 mph, with gusts as high as 20 mph.
Thursday
A 40 percent chance of showers and thunderstorms. Sunny, with a high near 86. East wind 9 to 13 mph.
Thursday Night
A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 78.
Friday
A 50 percent chance of showers and thunderstorms. Mostly sunny, with a high near 86.
Friday Night
A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 77.
Saturday
Showers and thunderstorms likely. Mostly sunny, with a high near 85. Chance of precipitation is 60%.
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ABOUT THIS FORECAST

 
Point Forecast:
23 Miles NNW Long Key FL
 25.14°N 80.92°W
4:31 am EDT Oct 11, 2026
2pm EDT Oct 11, 2026-6pm EDT Oct 17, 2026
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database