National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Heat the Southwest; Fire Weather in the Central U.S.; Kona Low Impacting Hawaii

A rare March heat wave is ongoing with much above-normal temperatures over the Southwest U.S. through this weekend. Periods of critical fire weather will persist from the central Rockies to the central and southern Plains through the weekend as gusty winds and low relative humidity continue. A Kona low will continue to bring several rounds of moderate to heavy rainfall to Hawaii through Sunday. Read More >

Current conditions at

The Florida Keys - Marathon International Airport (KMTH)

Lat: 24.73°NLon: 81.05°WElev: 13ft.

Fair

73°F

23°C

Humidity 64%
Wind Speed NW 6 mph
Barometer 30.04 in (1017.2 mb)
Dewpoint 60°F (16°C)
Visibility 10.00 mi
Last update 21 Mar 5:53 pm EDT
Extended Forecast for

3 Miles NE Islamorada FL

  • Tonight

    Tonight: Mostly clear, with a low around 67. Northeast wind around 10 mph becoming north after midnight.

    Low: 67 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 75. North wind around 5 mph becoming east in the afternoon.

    High: 75 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 68. East wind 5 to 10 mph.

    Low: 68 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 76. Northeast wind 5 to 10 mph.

    High: 76 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 67. Southeast wind around 5 mph becoming north in the evening.

    Low: 67 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 76.

    High: 76 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 70.

    Low: 70 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 77.

    High: 77 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 71.

    Low: 71 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly clear, with a low around 67. Northeast wind around 10 mph becoming north after midnight.
Sunday
Sunny, with a high near 75. North wind around 5 mph becoming east in the afternoon.
Sunday Night
Mostly clear, with a low around 68. East wind 5 to 10 mph.
Monday
Sunny, with a high near 76. Northeast wind 5 to 10 mph.
Monday Night
Mostly clear, with a low around 67. Southeast wind around 5 mph becoming north in the evening.
Tuesday
Sunny, with a high near 76.
Tuesday Night
Mostly clear, with a low around 70.
Wednesday
Sunny, with a high near 77.
Wednesday Night
Mostly clear, with a low around 71.
Thursday
Sunny, with a high near 78.
Thursday Night
Mostly clear, with a low around 72.
Friday
Sunny, with a high near 78.
Friday Night
Partly cloudy, with a low around 71.
Saturday
A slight chance of showers. Mostly sunny, with a high near 78. Chance of precipitation is 10%.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles NE Islamorada FL
 24.95°N 80.59°W (Elev. 0 ft)
Last Update:
6:15 pm EDT Mar 21, 2026
Forecast Valid:
6pm EDT Mar 21, 2026-6pm EDT Mar 28, 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