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

The Florida Keys - Marathon International Airport (KMTH)

Lat: 24.73°NLon: 81.05°WElev: 13ft.

Fair

76°F

24°C

Humidity 77%
Wind Speed E 13 mph
Barometer 30.13 in (1020.1 mb)
Dewpoint 68°F (20°C)
Visibility 10.00 mi
Heat Index77°F (25°C)
Last update 9 Jan 11:53 pm EST
Extended Forecast for

23 Miles NNW Long Key FL

  • Overnight

    Overnight: Partly cloudy, with a low around 67. East wind around 9 mph.

    Low: 67 °F

    Partly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 79. East wind 8 to 11 mph.

    High: 79 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 66. East wind around 6 mph.

    Low: 66 °F

    Mostly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 80. East wind around 6 mph.

    High: 80 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: A 20 percent chance of showers. Mostly cloudy, with a low around 62. North wind 5 to 11 mph, with gusts as high as 22 mph.

    Low: 62 °F

    Slight Chance
    Showers

  • Monday

    Monday: A 20 percent chance of showers after 1pm. Mostly sunny, with a high near 77. Northeast wind 13 to 15 mph, with gusts as high as 23 mph.

    High: 77 °F

    Mostly Sunny
    then Slight
    Chance
    Showers

  • Monday Night

    Monday Night: Partly cloudy, with a low around 63. Northeast wind 11 to 13 mph.

    Low: 63 °F

    Partly Cloudy

  • Tuesday

    Tuesday: A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 77. East wind around 14 mph, with gusts as high as 20 mph.

    High: 77 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 65. East wind 7 to 9 mph.

    Low: 65 °F

    Partly Cloudy

Detailed Forecast

Overnight
Partly cloudy, with a low around 67. East wind around 9 mph.
Saturday
Sunny, with a high near 79. East wind 8 to 11 mph.
Saturday Night
Mostly cloudy, with a low around 66. East wind around 6 mph.
Sunday
Partly sunny, with a high near 80. East wind around 6 mph.
Sunday Night
A 20 percent chance of showers. Mostly cloudy, with a low around 62. North wind 5 to 11 mph, with gusts as high as 22 mph.
Monday
A 20 percent chance of showers after 1pm. Mostly sunny, with a high near 77. Northeast wind 13 to 15 mph, with gusts as high as 23 mph.
Monday Night
Partly cloudy, with a low around 63. Northeast wind 11 to 13 mph.
Tuesday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 77. East wind around 14 mph, with gusts as high as 20 mph.
Tuesday Night
Partly cloudy, with a low around 65. East wind 7 to 9 mph.
Wednesday
A 30 percent chance of showers and thunderstorms, mainly after 1pm. Partly sunny, with a high near 76.
Wednesday Night
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 61.
Thursday
A 30 percent chance of showers. Mostly sunny, with a high near 74. Breezy.
Thursday Night
Partly cloudy, with a low around 50.
Friday
Sunny, with a high near 69.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
23 Miles NNW Long Key FL
 25.14°N 80.92°W
Last Update:
3:31 pm EST Jan 9, 2026
Forecast Valid:
12am EST Jan 10, 2026-6pm EST Jan 16, 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