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.

Fair

87°F

31°C

Humidity 70%
Wind Speed Calm
Barometer 29.98 in (1015.2 mb)
Dewpoint 76°F (24°C)
Visibility 10.00 mi
Heat Index98°F (37°C)
Last update 2 Sep 9:53 am EDT
Extended Forecast for

19 Miles NW Islamorada FL

  • Today

    Today: A 40 percent chance of showers and thunderstorms, mainly after 11am. Mostly sunny, with a high near 88. Heat index values as high as 106. Calm wind becoming south around 6 mph in the afternoon.

    High: 88 °F

    Chance
    T-storms

  • Tonight

    Tonight: A 20 percent chance of showers and thunderstorms before 9pm. Partly cloudy, with a low around 80. Light and variable wind.

    Low: 80 °F

    Slight Chance
    T-storms then
    Partly Cloudy

  • Thursday

    Thursday: A 30 percent chance of showers and thunderstorms, mainly after 2pm. Mostly sunny, with a high near 88. Heat index values as high as 106. Light and variable wind becoming south 5 to 7 mph in the afternoon.

    High: 88 °F

    Chance
    T-storms

  • Thursday Night

    Thursday Night: A 40 percent chance of showers and thunderstorms, mainly after 2am. Partly cloudy, with a low around 82. Southeast wind around 7 mph.

    Low: 82 °F

    Chance
    T-storms

  • Friday

    Friday: A chance of showers and thunderstorms before 8am, then showers likely and possibly a thunderstorm between 8am and 2pm, then showers and thunderstorms likely after 2pm. Mostly sunny, with a high near 88. Southeast wind 7 to 9 mph. Chance of precipitation is 70%.

    High: 88 °F

    Showers
    Likely then
    T-storms
    Likely

  • Friday Night

    Friday Night: A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 81. East wind around 8 mph.

    Low: 81 °F

    Chance
    T-storms

  • Saturday

    Saturday: Showers and thunderstorms. High near 88. Southeast wind 5 to 7 mph. Chance of precipitation is 80%.

    High: 88 °F

    T-storms

  • Saturday Night

    Saturday Night: Showers and thunderstorms, mainly before 8pm. Low around 81. East wind 3 to 5 mph. Chance of precipitation is 80%.

    Low: 81 °F

    T-storms then
    Chance
    T-storms

  • Sunday

    Sunday: Showers likely and possibly a thunderstorm before 2pm, then a chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 88. Calm wind becoming south around 5 mph in the afternoon. Chance of precipitation is 60%.

    High: 88 °F

    Showers
    Likely

Detailed Forecast

Today
A 40 percent chance of showers and thunderstorms, mainly after 11am. Mostly sunny, with a high near 88. Heat index values as high as 106. Calm wind becoming south around 6 mph in the afternoon.
Tonight
A 20 percent chance of showers and thunderstorms before 9pm. Partly cloudy, with a low around 80. Light and variable wind.
Thursday
A 30 percent chance of showers and thunderstorms, mainly after 2pm. Mostly sunny, with a high near 88. Heat index values as high as 106. Light and variable wind becoming south 5 to 7 mph in the afternoon.
Thursday Night
A 40 percent chance of showers and thunderstorms, mainly after 2am. Partly cloudy, with a low around 82. Southeast wind around 7 mph.
Friday
A chance of showers and thunderstorms before 8am, then showers likely and possibly a thunderstorm between 8am and 2pm, then showers and thunderstorms likely after 2pm. Mostly sunny, with a high near 88. Southeast wind 7 to 9 mph. Chance of precipitation is 70%.
Friday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 81. East wind around 8 mph.
Saturday
Showers and thunderstorms. High near 88. Southeast wind 5 to 7 mph. Chance of precipitation is 80%.
Saturday Night
Showers and thunderstorms, mainly before 8pm. Low around 81. East wind 3 to 5 mph. Chance of precipitation is 80%.
Sunday
Showers likely and possibly a thunderstorm before 2pm, then a chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 88. Calm wind becoming south around 5 mph in the afternoon. Chance of precipitation is 60%.
Sunday Night
A 40 percent chance of showers and thunderstorms, mainly after 2am. Mostly cloudy, with a low around 80.
Labor Day
A 50 percent chance of showers and thunderstorms. Mostly sunny, with a high near 88.
Monday Night
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 80.
Tuesday
A 50 percent chance of showers and thunderstorms. Mostly sunny, with a high near 88.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
19 Miles NW Islamorada FL
 25.15°N 80.79°W
Last Update:
4:31 am EDT Sep 2, 2026
Forecast Valid:
10am EDT Sep 2, 2026-6pm EDT Sep 8, 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