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

Lake Effect Snow through Friday; Heavy Rain, Thunderstorms and Mountain Snow in California

Periods of moderate to heavy lake effect snow will continue through Friday downwind of Lake Erie and Ontario. Several additional inches of accumulating snow are expected. A Pacific storm will bring heavy rain and mountain snow across California, the Southwest and Intermountain West today. Isolated severe thunderstorms and scattered flash flooding is possible across parts of southern California. Read More >

Current conditions at

The Florida Keys - Marathon International Airport (KMTH)

Lat: 24.73°NLon: 81.05°WElev: 13ft.

Fair

63°F

17°C

Humidity 63%
Wind Speed NA
Barometer 30.15 in (1020.8 mb)
Dewpoint 50°F (10°C)
Visibility 10.00 mi
Last update 1 Jan 12:53 pm EST
Extended Forecast for

Key Colony Beach FL

  • New Year's Day

    New Year's Day: Sunny, with a high near 65. North wind around 5 mph.

    High: 65 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 59. Northwest wind 5 to 10 mph.

    Low: 59 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 67. Northeast wind around 5 mph becoming calm in the afternoon.

    High: 67 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 61. Calm wind.

    Low: 61 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 73. Calm wind becoming west around 5 mph.

    High: 73 °F

    Sunny

  • Saturday Night

    Saturday Night: A slight chance of showers. Mostly clear, with a low around 66. Chance of precipitation is 10%.

    Low: 66 °F

    Slight Chance
    Showers

  • Sunday

    Sunday: Sunny, with a high near 77.

    High: 77 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 65.

    Low: 65 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 76.

    High: 76 °F

    Sunny

Detailed Forecast

New Year's Day
Sunny, with a high near 65. North wind around 5 mph.
Tonight
Mostly clear, with a low around 59. Northwest wind 5 to 10 mph.
Friday
Sunny, with a high near 67. Northeast wind around 5 mph becoming calm in the afternoon.
Friday Night
Mostly clear, with a low around 61. Calm wind.
Saturday
Sunny, with a high near 73. Calm wind becoming west around 5 mph.
Saturday Night
A slight chance of showers. Mostly clear, with a low around 66. Chance of precipitation is 10%.
Sunday
Sunny, with a high near 77.
Sunday Night
Mostly clear, with a low around 65.
Monday
Sunny, with a high near 76.
Monday Night
Mostly clear, with a low around 67.
Tuesday
Sunny, with a high near 76.
Tuesday Night
Mostly clear, with a low around 68.
Wednesday
Sunny, with a high near 78.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Key Colony Beach FL
 24.74°N 81.02°W (Elev. 0 ft)
Last Update:
1:15 pm EST Jan 1, 2026
Forecast Valid:
1pm EST Jan 1, 2026-6pm EST Jan 7, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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