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

Early Spring Heat Wave in the Southwest U.S.; Critical Fire Weather in the Central Rockies and Plains

An unusual early Spring heat wave will continue much above-normal temperatures over the Southwest U.S. through early next week. Many locations are likely to set records for the highest-ever March temperature. Periods of critical fire weather will persist from the central Rockies to the central Plains through Saturday as gusty winds and low relative humidity continue. Read More >

Current conditions at

The Florida Keys - Marathon International Airport (KMTH)

Lat: 24.73°NLon: 81.05°WElev: 13ft.

Overcast

65°F

18°C

Humidity 87%
Wind Speed N 13 G 25 mph
Barometer 30.01 in (1016.1 mb)
Dewpoint 61°F (16°C)
Visibility 10.00 mi
Last update 19 Mar 7:53 am EDT
Extended Forecast for

Marathon Shores FL

  • Today

    Today: A slight chance of showers. Partly sunny, with a high near 74. Breezy, with a north wind 15 to 20 mph. Chance of precipitation is 10%.

    High: 74 °F

    Slight Chance
    Showers and
    Breezy

  • Tonight

    Tonight: A slight chance of showers. Partly cloudy, with a low around 64. Breezy, with a north wind 15 to 20 mph. Chance of precipitation is 10%.

    Low: 64 °F

    Slight Chance
    Showers and
    Breezy

  • Friday

    Friday: A slight chance of showers. Mostly sunny, with a high near 74. Breezy, with a north wind 15 to 20 mph. Chance of precipitation is 10%.

    High: 74 °F

    Slight Chance
    Showers and
    Breezy

  • Friday Night

    Friday Night: Mostly clear, with a low around 64. Northeast wind around 15 mph.

    Low: 64 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 76. North wind 10 to 15 mph.

    High: 76 °F

    Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 67.

    Low: 67 °F

    Partly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 78.

    High: 78 °F

    Sunny

  • Sunday Night

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

    Low: 70 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 78.

    High: 78 °F

    Sunny

Detailed Forecast

Today
A slight chance of showers. Partly sunny, with a high near 74. Breezy, with a north wind 15 to 20 mph. Chance of precipitation is 10%.
Tonight
A slight chance of showers. Partly cloudy, with a low around 64. Breezy, with a north wind 15 to 20 mph. Chance of precipitation is 10%.
Friday
A slight chance of showers. Mostly sunny, with a high near 74. Breezy, with a north wind 15 to 20 mph. Chance of precipitation is 10%.
Friday Night
Mostly clear, with a low around 64. Northeast wind around 15 mph.
Saturday
Sunny, with a high near 76. North wind 10 to 15 mph.
Saturday Night
Partly cloudy, with a low around 67.
Sunday
Sunny, with a high near 78.
Sunday Night
Mostly clear, with a low around 70.
Monday
Sunny, with a high near 78.
Monday Night
Mostly clear, with a low around 69.
Tuesday
Sunny, with a high near 78.
Tuesday Night
Mostly clear, with a low around 70.
Wednesday
A slight chance of showers. Sunny, with a high near 79. Chance of precipitation is 10%.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Marathon Shores FL
 24.74°N 81.04°W (Elev. 0 ft)
Last Update:
8:15 am EDT Mar 19, 2026
Forecast Valid:
8am EDT Mar 19, 2026-6pm EDT Mar 25, 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