National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
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 73%
Wind Speed SE 9 mph
Barometer 30.15 in (1020.9 mb)
Dewpoint 78°F (26°C)
Visibility 10.00 mi
Heat Index102°F (39°C)
Last update 13 Jul 11:53 am EDT
Extended Forecast for

5 Miles WSW Long Key FL

  • This Afternoon

    This Afternoon: Sunny, with a high near 91. East wind 5 to 10 mph.

    High: 91 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 84. East wind around 10 mph.

    Low: 84 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 91. East wind around 10 mph.

    High: 91 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 84. East wind around 10 mph.

    Low: 84 °F

    Partly Cloudy

  • Wednesday

    Wednesday: A slight chance of showers and thunderstorms. Sunny, with a high near 92. East wind around 10 mph. Chance of precipitation is 10%.

    High: 92 °F

    Slight Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A slight chance of showers and thunderstorms. Partly cloudy, with a low around 84. Chance of precipitation is 10%.

    Low: 84 °F

    Slight Chance
    T-storms

  • Thursday

    Thursday: A slight chance of showers and thunderstorms. Mostly sunny, with a high near 91. Chance of precipitation is 10%.

    High: 91 °F

    Slight Chance
    T-storms

  • Thursday Night

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

    Low: 83 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 88.

    High: 88 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
Sunny, with a high near 91. East wind 5 to 10 mph.
Tonight
Mostly clear, with a low around 84. East wind around 10 mph.
Tuesday
Sunny, with a high near 91. East wind around 10 mph.
Tuesday Night
Partly cloudy, with a low around 84. East wind around 10 mph.
Wednesday
A slight chance of showers and thunderstorms. Sunny, with a high near 92. East wind around 10 mph. Chance of precipitation is 10%.
Wednesday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 84. Chance of precipitation is 10%.
Thursday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 91. Chance of precipitation is 10%.
Thursday Night
Partly cloudy, with a low around 83.
Friday
Mostly sunny, with a high near 88.
Friday Night
Partly cloudy, with a low around 83.
Saturday
Mostly sunny, with a high near 88.
Saturday Night
Partly cloudy, with a low around 83.
Sunday
Sunny, with a high near 88.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
5 Miles WSW Long Key FL
 24.79°N 80.89°W (Elev. 0 ft)
Last Update:
11:15 am EDT Jul 13, 2026
Forecast Valid:
12pm EDT Jul 13, 2026-6pm EDT Jul 19, 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