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

85°F

29°C

Humidity 80%
Wind Speed SE 7 mph
Barometer 30.04 in (1017.1 mb)
Dewpoint 78°F (26°C)
Visibility 10.00 mi
Heat Index97°F (36°C)
Last update 19 Jun 2:53 am EDT
Extended Forecast for

5 Miles WSW Long Key FL

  • Overnight

    Overnight: A slight chance of showers and thunderstorms. Mostly cloudy, with a low around 85. Southeast wind around 10 mph. Chance of precipitation is 10%.

    Low: 85 °F

    Slight Chance
    T-storms

  • Juneteenth

    Juneteenth: A slight chance of showers and thunderstorms before 2pm. Mostly sunny, with a high near 87. Southeast wind 5 to 10 mph. Chance of precipitation is 10%.

    High: 87 °F

    Slight Chance
    T-storms

  • Friday Night

    Friday Night: A slight chance of showers and thunderstorms after 8pm. Partly cloudy, with a low around 85. Southeast wind 5 to 10 mph. Chance of precipitation is 10%.

    Low: 85 °F

    Slight Chance
    T-storms

  • Saturday

    Saturday: A slight chance of showers and thunderstorms. Mostly sunny, with a high near 87. Southeast wind around 5 mph. Chance of precipitation is 20%.

    High: 87 °F

    Slight Chance
    T-storms

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 82. Calm wind becoming northeast around 5 mph after midnight.

    Low: 82 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 87.

    High: 87 °F

    Mostly Sunny

  • Sunday Night

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

    Low: 83 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 88.

    High: 88 °F

    Sunny

  • Monday Night

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

    Low: 83 °F

    Partly Cloudy

Detailed Forecast

Overnight
A slight chance of showers and thunderstorms. Mostly cloudy, with a low around 85. Southeast wind around 10 mph. Chance of precipitation is 10%.
Juneteenth
A slight chance of showers and thunderstorms before 2pm. Mostly sunny, with a high near 87. Southeast wind 5 to 10 mph. Chance of precipitation is 10%.
Friday Night
A slight chance of showers and thunderstorms after 8pm. Partly cloudy, with a low around 85. Southeast wind 5 to 10 mph. Chance of precipitation is 10%.
Saturday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 87. Southeast wind around 5 mph. Chance of precipitation is 20%.
Saturday Night
Partly cloudy, with a low around 82. Calm wind becoming northeast around 5 mph after midnight.
Sunday
Mostly sunny, with a high near 87.
Sunday Night
Mostly clear, with a low around 83.
Monday
Sunny, with a high near 88.
Monday Night
Partly cloudy, with a low around 83.
Tuesday
Sunny, with a high near 88.
Tuesday Night
A slight chance of showers. Mostly clear, with a low around 83. Chance of precipitation is 10%.
Wednesday
Sunny, with a high near 88.
Wednesday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 83. Chance of precipitation is 20%.
Thursday
Sunny, with a high near 87.
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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:
2:15 am EDT Jun 19, 2026
Forecast Valid:
2am EDT Jun 19, 2026-6pm EDT Jun 25, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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