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

Heat Wave Continues in the West; Critical Fire Weather Conditions in the High Plains

An anomalously early heat wave will continue to intensify and expand across the West and Southwest as the week progresses. Numerous daily and potentially monthly record highs are expected to be broken. Critical fire weather conditions will continue over the next couple of days across portions of the High Plains as gusty winds and dry conditions persist. Read More >

Current conditions at

The Florida Keys - Marathon International Airport (KMTH)

Lat: 24.73°NLon: 81.05°WElev: 13ft.

Overcast

66°F

19°C

Humidity 81%
Wind Speed N 10 G 20 mph
Barometer 30.08 in (1018.5 mb)
Dewpoint 60°F (16°C)
Visibility 10.00 mi
Last update 18 Mar 11:53 am EDT
Extended Forecast for

Key Colony Beach FL

  • This Afternoon

    This Afternoon: A chance of showers. Cloudy, with a high near 74. North wind around 15 mph. Chance of precipitation is 30%.

    High: 74 °F

    Chance
    Showers

  • Tonight

    Tonight: A chance of showers. Cloudy, with a low around 67. Breezy, with a north wind around 20 mph. Chance of precipitation is 40%.

    Low: 67 °F

    Chance
    Showers and
    Breezy

  • Thursday

    Thursday: A slight chance of showers. Partly sunny, with a high near 76. Breezy, with a north wind 15 to 20 mph. Chance of precipitation is 20%.

    High: 76 °F

    Slight Chance
    Showers and
    Breezy

  • Thursday Night

    Thursday Night: A slight chance of showers. Partly cloudy, with a low around 67. Northeast wind around 15 mph. Chance of precipitation is 20%.

    Low: 67 °F

    Slight Chance
    Showers

  • Friday

    Friday: A slight chance of showers. Mostly sunny, with a high near 76. North wind around 15 mph. Chance of precipitation is 10%.

    High: 76 °F

    Slight Chance
    Showers

  • Friday Night

    Friday Night: Partly cloudy, with a low around 69.

    Low: 69 °F

    Partly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 77.

    High: 77 °F

    Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 71.

    Low: 71 °F

    Partly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 77.

    High: 77 °F

    Sunny

Detailed Forecast

This Afternoon
A chance of showers. Cloudy, with a high near 74. North wind around 15 mph. Chance of precipitation is 30%.
Tonight
A chance of showers. Cloudy, with a low around 67. Breezy, with a north wind around 20 mph. Chance of precipitation is 40%.
Thursday
A slight chance of showers. Partly sunny, with a high near 76. Breezy, with a north wind 15 to 20 mph. Chance of precipitation is 20%.
Thursday Night
A slight chance of showers. Partly cloudy, with a low around 67. Northeast wind around 15 mph. Chance of precipitation is 20%.
Friday
A slight chance of showers. Mostly sunny, with a high near 76. North wind around 15 mph. Chance of precipitation is 10%.
Friday Night
Partly cloudy, with a low around 69.
Saturday
Sunny, with a high near 77.
Saturday Night
Partly cloudy, with a low around 71.
Sunday
Sunny, with a high near 77.
Sunday Night
Mostly clear, with a low around 72.
Monday
Sunny, with a high near 78.
Monday Night
Mostly clear, with a low around 72.
Tuesday
Sunny, with a high near 78.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Key Colony Beach FL
 24.74°N 81.02°W (Elev. 0 ft)
Last Update:
12:15 pm EDT Mar 18, 2026
Forecast Valid:
12pm EDT Mar 18, 2026-6pm EDT Mar 24, 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