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.

Partly Cloudy

85°F

29°C

Humidity 72%
Wind Speed NE 15 mph
Barometer 30.04 in (1017.2 mb)
Dewpoint 75°F (24°C)
Visibility 10.00 mi
Heat Index93°F (34°C)
Last update 15 Oct 11:53 am EDT
Extended Forecast for

23 Miles NNW Long Key FL

  • This Afternoon

    This Afternoon: A 30 percent chance of showers and thunderstorms, mainly between 4pm and 5pm. Sunny, with a high near 88. East wind around 10 mph.

    High: 88 °F

    Chance
    Showers

  • Tonight

    Tonight: A 30 percent chance of showers and thunderstorms, mainly after 5am. Partly cloudy, with a low around 78. East wind 7 to 10 mph.

    Low: 78 °F

    Chance
    T-storms then
    Chance
    Showers

  • Friday

    Friday: A 40 percent chance of showers and thunderstorms, mainly after 2pm. Mostly sunny, with a high near 87. East wind 6 to 8 mph.

    High: 87 °F

    Chance
    T-storms

  • Friday Night

    Friday Night: A chance of showers and thunderstorms. Partly cloudy, with a low around 76. Northeast wind 3 to 5 mph. Chance of precipitation is 40%.

    Low: 76 °F

    Chance
    T-storms then
    Chance
    Showers

  • Saturday

    Saturday: A chance of showers before 8am, then a chance of showers and thunderstorms between 8am and 2pm, then showers likely and possibly a thunderstorm after 2pm. Partly sunny, with a high near 86. Calm wind becoming northeast around 5 mph in the afternoon. Chance of precipitation is 70%.

    High: 86 °F

    Chance
    Showers then
    Showers
    Likely

  • Saturday Night

    Saturday Night: Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 74. Northeast wind 7 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 70%.

    Low: 74 °F

    Showers
    Likely

  • Sunday

    Sunday: Showers and possibly a thunderstorm. High near 83. East wind 13 to 15 mph, with gusts as high as 23 mph. Chance of precipitation is 80%.

    High: 83 °F

    Showers

  • Sunday Night

    Sunday Night: Showers and possibly a thunderstorm before 8pm, then a chance of showers and thunderstorms after 8pm. Low around 74. Windy, with a northeast wind 20 to 24 mph. Chance of precipitation is 80%.

    Low: 74 °F

    Showers and
    Windy then
    Chance
    T-storms and
    Breezy

  • Monday

    Monday: Showers likely and possibly a thunderstorm. Partly sunny, with a high near 83. Windy, with an east wind 16 to 21 mph, with gusts as high as 24 mph. Chance of precipitation is 60%.

    High: 83 °F

    Showers
    Likely and
    Windy

Detailed Forecast

This Afternoon
A 30 percent chance of showers and thunderstorms, mainly between 4pm and 5pm. Sunny, with a high near 88. East wind around 10 mph.
Tonight
A 30 percent chance of showers and thunderstorms, mainly after 5am. Partly cloudy, with a low around 78. East wind 7 to 10 mph.
Friday
A 40 percent chance of showers and thunderstorms, mainly after 2pm. Mostly sunny, with a high near 87. East wind 6 to 8 mph.
Friday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 76. Northeast wind 3 to 5 mph. Chance of precipitation is 40%.
Saturday
A chance of showers before 8am, then a chance of showers and thunderstorms between 8am and 2pm, then showers likely and possibly a thunderstorm after 2pm. Partly sunny, with a high near 86. Calm wind becoming northeast around 5 mph in the afternoon. Chance of precipitation is 70%.
Saturday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 74. Northeast wind 7 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 70%.
Sunday
Showers and possibly a thunderstorm. High near 83. East wind 13 to 15 mph, with gusts as high as 23 mph. Chance of precipitation is 80%.
Sunday Night
Showers and possibly a thunderstorm before 8pm, then a chance of showers and thunderstorms after 8pm. Low around 74. Windy, with a northeast wind 20 to 24 mph. Chance of precipitation is 80%.
Monday
Showers likely and possibly a thunderstorm. Partly sunny, with a high near 83. Windy, with an east wind 16 to 21 mph, with gusts as high as 24 mph. Chance of precipitation is 60%.
Monday Night
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 74. Windy.
Tuesday
A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 84. Breezy.
Tuesday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 74. Windy.
Wednesday
A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 84. Breezy.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
23 Miles NNW Long Key FL
 25.14°N 80.92°W
Last Update:
11:26 am EDT Oct 15, 2026
Forecast Valid:
12pm EDT Oct 15, 2026-6pm EDT Oct 21, 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