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

Strong to Severe Thunderstorms Continue Tonight in the East; Early Heat Wave in the West

Scattered strong to severe storms with damaging winds and potentially a tornado or two are expected tonight from the coastal Carolinas into the Mid-Atlantic states. 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. Read More >

Current conditions at

The Florida Keys - Marathon International Airport (KMTH)

Lat: 24.73°NLon: 81.05°WElev: 13ft.

Rain Fog/Mist

69°F

21°C

Humidity 93%
Wind Speed Vrbl 6 G 17 mph
Barometer 29.99 in (1015.5 mb)
Dewpoint 67°F (19°C)
Visibility 6.00 mi
Last update 17 Mar 4:53 am EDT
Extended Forecast for

Key Colony Beach FL

  • Overnight

    Overnight: Showers and possibly a thunderstorm. Steady temperature around 74. Northwest wind around 10 mph. Chance of precipitation is 90%.

    Low: 74 °F

    T-storms

  • Tuesday

    Tuesday: Showers and possibly a thunderstorm before 11am, then a chance of showers. High near 76. North wind 10 to 15 mph. Chance of precipitation is 80%.

    High: 76 °F

    T-storms then
    Chance
    Showers

  • Tuesday Night

    Tuesday Night: A chance of showers. Cloudy, with a low around 64. North wind around 15 mph. Chance of precipitation is 40%.

    Low: 64 °F

    Chance
    Showers

  • Wednesday

    Wednesday: A chance of showers and thunderstorms. Cloudy, with a high near 74. North wind around 15 mph. Chance of precipitation is 50%.

    High: 74 °F

    Chance
    Showers

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms. Cloudy, with a low around 67. Breezy, with a northeast wind 15 to 20 mph. Chance of precipitation is 50%.

    Low: 67 °F

    Chance
    Showers and
    Breezy

  • Thursday

    Thursday: A chance of showers. Mostly cloudy, with a high near 76. Breezy. Chance of precipitation is 40%.

    High: 76 °F

    Chance
    Showers and
    Breezy

  • Thursday Night

    Thursday Night: A slight chance of showers. Mostly cloudy, with a low around 66. Chance of precipitation is 20%.

    Low: 66 °F

    Slight Chance
    Showers

  • Friday

    Friday: A slight chance of showers. Mostly sunny, with a high near 76. Chance of precipitation is 20%.

    High: 76 °F

    Slight Chance
    Showers

  • Friday Night

    Friday Night: Mostly clear, with a low around 68.

    Low: 68 °F

    Mostly Clear

Detailed Forecast

Overnight
Showers and possibly a thunderstorm. Steady temperature around 74. Northwest wind around 10 mph. Chance of precipitation is 90%.
Tuesday
Showers and possibly a thunderstorm before 11am, then a chance of showers. High near 76. North wind 10 to 15 mph. Chance of precipitation is 80%.
Tuesday Night
A chance of showers. Cloudy, with a low around 64. North wind around 15 mph. Chance of precipitation is 40%.
Wednesday
A chance of showers and thunderstorms. Cloudy, with a high near 74. North wind around 15 mph. Chance of precipitation is 50%.
Wednesday Night
A chance of showers and thunderstorms. Cloudy, with a low around 67. Breezy, with a northeast wind 15 to 20 mph. Chance of precipitation is 50%.
Thursday
A chance of showers. Mostly cloudy, with a high near 76. Breezy. Chance of precipitation is 40%.
Thursday Night
A slight chance of showers. Mostly cloudy, with a low around 66. Chance of precipitation is 20%.
Friday
A slight chance of showers. Mostly sunny, with a high near 76. Chance of precipitation is 20%.
Friday Night
Mostly clear, with a low around 68.
Saturday
Sunny, with a high near 75.
Saturday Night
Mostly clear, with a low around 70.
Sunday
Sunny, with a high near 77.
Sunday Night
Mostly clear, with a low around 71.
Monday
A slight chance of showers. Sunny, with a high near 77. Chance of precipitation is 10%.
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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:
5:15 am EDT Mar 17, 2026
Forecast Valid:
5am EDT Mar 17, 2026-6pm EDT Mar 23, 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