Lake-effect Snow and Whiteout Conditions in the Great Lakes Region; Below-average Temperatures in the East

Heavy lake-effect and lake-enhanced snow will persist downwind of the Great Lakes and produce some whiteout conditions that could cause difficult travel conditions. A coastal low will produce moderate to heavy snow over parts of southern and eastern New England into the afternoon. Below average temperatures are expected across the eastern U.S., particularly with chilly morning temperatures. Read More >

Current conditions at

The Florida Keys - Marathon International Airport (KMTH)

Lat: 24.73°NLon: 81.05°WElev: 13ft.

Fair

55°F

13°C

Humidity 64%
Wind Speed N 10 G 22 mph
Barometer 30.22 in (1023.2 mb)
Dewpoint 43°F (6°C)
Visibility 10.00 mi
Wind Chill52°F (11°C)
Last update 19 Jan 10:53 am EST
Extended Forecast for

Key Colony Beach FL

  • M.L.King Day

    M.L.King Day: Mostly sunny, with a high near 63. Breezy, with a north wind 15 to 20 mph decreasing to 10 to 15 mph in the afternoon.

    High: 63 °F

    Mostly Sunny
    and Breezy

  • Tonight

    Tonight: Mostly cloudy, with a low around 59. Breezy, with a north wind 10 to 20 mph.

    Low: 59 °F

    Mostly Cloudy
    then Mostly
    Cloudy and
    Breezy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 71. Breezy, with a northeast wind 15 to 20 mph.

    High: 71 °F

    Mostly Sunny
    and Breezy

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 65. Breezy, with a northeast wind 15 to 20 mph.

    Low: 65 °F

    Partly Cloudy
    and Breezy

  • Wednesday

    Wednesday: A slight chance of showers.  Partly sunny, with a high near 77. Northeast wind around 15 mph.  Chance of precipitation is 10%.

    High: 77 °F

    Slight Chance
    Showers

  • Wednesday Night

    Wednesday Night: A chance of showers.  Mostly cloudy, with a low around 69. Chance of precipitation is 30%.

    Low: 69 °F

    Chance
    Showers

  • Thursday

    Thursday: A chance of showers.  Partly sunny, with a high near 79. Chance of precipitation is 30%.

    High: 79 °F

    Chance
    Showers

  • Thursday Night

    Thursday Night: A chance of showers.  Mostly cloudy, with a low around 70. Chance of precipitation is 30%.

    Low: 70 °F

    Chance
    Showers

  • Friday

    Friday: A slight chance of showers.  Mostly sunny, with a high near 79. Chance of precipitation is 20%.

    High: 79 °F

    Slight Chance
    Showers

Detailed Forecast

M.L.King Day
Mostly sunny, with a high near 63. Breezy, with a north wind 15 to 20 mph decreasing to 10 to 15 mph in the afternoon.
Tonight
Mostly cloudy, with a low around 59. Breezy, with a north wind 10 to 20 mph.
Tuesday
Mostly sunny, with a high near 71. Breezy, with a northeast wind 15 to 20 mph.
Tuesday Night
Partly cloudy, with a low around 65. Breezy, with a northeast wind 15 to 20 mph.
Wednesday
A slight chance of showers. Partly sunny, with a high near 77. Northeast wind around 15 mph. Chance of precipitation is 10%.
Wednesday Night
A chance of showers. Mostly cloudy, with a low around 69. Chance of precipitation is 30%.
Thursday
A chance of showers. Partly sunny, with a high near 79. Chance of precipitation is 30%.
Thursday Night
A chance of showers. Mostly cloudy, with a low around 70. Chance of precipitation is 30%.
Friday
A slight chance of showers. Mostly sunny, with a high near 79. Chance of precipitation is 20%.
Friday Night
A slight chance of showers. Partly cloudy, with a low around 71. Chance of precipitation is 10%.
Saturday
A slight chance of showers. Sunny, with a high near 80. Chance of precipitation is 10%.
Saturday Night
A slight chance of showers. Mostly clear, with a low around 72. Chance of precipitation is 10%.
Sunday
A slight chance of showers. Sunny, with a high near 80. Chance of precipitation is 10%.
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ABOUT THIS FORECAST

 
Point Forecast:
Key Colony Beach FL
 24.71°N 81.02°W (Elev. 0 ft)
11:15 am EST Jan 19, 2026
11am EST Jan 19, 2026-6pm EST Jan 25, 2026
 
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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