Heavy Great Lakes Snow through Friday; Extreme Cold and Potential for Major Winter Storm Late Week into this Weekend

Multiple clipper systems will bring cold temperatures and enhance lake-effect snow downwind of the Great Lakes. An arctic blast will bring frigid temperatures accompanied with gusty winds that may lead to dangerous wind chills beginning in the Northern Plains Thursday before expanding to the South and East. An expansive winter storm will start Friday in the Southern Rockies/Plains and Mid-South. Read More >

Current conditions at

The Florida Keys - Marathon International Airport (KMTH)

Lat: 24.73°NLon: 81.05°WElev: 13ft.

Fair

64°F

18°C

Humidity 78%
Wind Speed NE 7 mph
Barometer 30.23 in (1023.6 mb)
Dewpoint 57°F (14°C)
Visibility 10.00 mi
Last update 21 Jan 12:53 am EST
Extended Forecast for

Key Colony Beach FL

  • Overnight

    Overnight: Partly cloudy, with a low around 65. Northeast wind around 15 mph.

    Low: 65 °F

    Partly Cloudy

  • Wednesday

    Wednesday: A slight chance of showers.  Mostly sunny, with a high near 75. Northeast wind around 15 mph.  Chance of precipitation is 10%.

    High: 75 °F

    Slight Chance
    Showers

  • Wednesday Night

    Wednesday Night: A chance of showers.  Mostly cloudy, with a low around 69. Northeast wind 10 to 15 mph.  Chance of precipitation is 30%.

    Low: 69 °F

    Chance
    Showers

  • Thursday

    Thursday: A chance of showers.  Partly sunny, with a high near 78. Northeast wind 5 to 10 mph.  Chance of precipitation is 30%.

    High: 78 °F

    Chance
    Showers

  • Thursday Night

    Thursday Night: A slight chance of showers.  Partly cloudy, with a low around 68. Northeast wind 5 to 10 mph.  Chance of precipitation is 20%.

    Low: 68 °F

    Slight Chance
    Showers

  • Friday

    Friday: A slight chance of showers.  Mostly sunny, with a high near 79. Chance of precipitation is 10%.

    High: 79 °F

    Slight Chance
    Showers

  • Friday Night

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

    Low: 70 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 80.

    High: 80 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 72.

    Low: 72 °F

    Mostly Clear

Detailed Forecast

Overnight
Partly cloudy, with a low around 65. Northeast wind around 15 mph.
Wednesday
A slight chance of showers. Mostly sunny, with a high near 75. Northeast wind around 15 mph. Chance of precipitation is 10%.
Wednesday Night
A chance of showers. Mostly cloudy, with a low around 69. Northeast wind 10 to 15 mph. Chance of precipitation is 30%.
Thursday
A chance of showers. Partly sunny, with a high near 78. Northeast wind 5 to 10 mph. Chance of precipitation is 30%.
Thursday Night
A slight chance of showers. Partly cloudy, with a low around 68. Northeast wind 5 to 10 mph. Chance of precipitation is 20%.
Friday
A slight chance of showers. Mostly sunny, with a high near 79. Chance of precipitation is 10%.
Friday Night
Mostly clear, with a low around 70.
Saturday
Sunny, with a high near 80.
Saturday Night
Mostly clear, with a low around 72.
Sunday
Sunny, with a high near 81.
Sunday Night
Mostly clear, with a low around 71.
Monday
A slight chance of showers. Sunny, with a high near 79. Chance of precipitation is 10%.
Monday Night
A slight chance of showers. Partly cloudy, with a low around 65. Chance of precipitation is 10%.
Tuesday
A slight chance of showers. Partly sunny, with a high near 75. Chance of precipitation is 10%.
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ABOUT THIS FORECAST

 
Point Forecast:
Key Colony Beach FL
 24.74°N 81.02°W (Elev. 0 ft)
1:15 am EST Jan 21, 2026
1am EST Jan 21, 2026-6pm EST Jan 27, 2026
 
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Additional Resources

Radar & Satellite Image

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Hourly Weather Forecast

National Digital Forecast Database