Monroe County Emergency Management Updates

The weather in the Florida Keys differs from that of mainland Florida due to their small land mass and the fact that they are completely surrounded by warm waters. Florida Bay and the Gulf of Mexico to the north and west, and the Atlantic Ocean to the south and east. The influence of these waters is to temper summer heat as well as moderate the continental cold fronts approaching from the north during winter months.

Daily variations between high and low temperature are only about 10 degrees F throughout the year. Below you will find historical information about Weather in the Florida Keys. There are also links to NOAA weather stations from Key Largo, Marathon and Key West. You can also see a current Weather Radar Loop for the Florida Keys and check out the NOAA Hurricane Center for more current information.

Key Largo

Molasses Reef Light
Molasses Reef Light
Click on Image for Current Weather at Molasses Reef
Molasses Reef, FL — C-MAN station — VEEP payload — 25.01 N 80.38 W
Site elevation:0.0 m above mean sea level. Air temp height:15.5 m above site elevation. Anemometer height:15.8 m above site elevation. Barometer elevation:11.3 m above mean sea level.

Marathon

Long Key Weather Station
Long Key Weather Station
Click on Image for Current Weather at Long Key

Long Key, FL – C-MAN station = MARS payload – 24.84 N 80.86 W
Site elevation: 0.0 m above mean sea level. Air temp height: 6.7 m above site elevation. Anemometer height: 7.0 m above site elevation. Barometer elevation: 5.8 m above mean sea level.

Key West

Sand Key Weather Station
Sand Key Weather Station
Click on Image for Current Weather at Sand Key
Sand Key, FL – C-MAN station – MARS payload – 24.46 N 81.88 W
Site elevation: 0.0 m above mean sea level. Air temp height: 12.8 m above site elevation. Anemometer height: 13.1 m above site elevation. Barometer elevation: 6.1 m above mean sea level.

Historical Weather Data for Key West

JANUARY
Average High: 74.8°FAverage Low: 65.0°F
Record High: 86.0°FRecord Low: 41.0°F
Average Precipitation: 2.01 inchesNumber of rain days: 6
FEBRUARY
Average High: 75.4°FAverage Low: 65.6°F
Record High: 85.0°FRecord Low: 46.0°F
Average Precipitation: 1.80 inchesNumber of rain days: 6
MARCH
Average High: 78.6°FAverage Low: 69.0°F
Record High: 87.0°FRecord Low: 47.0°F
Average Precipitation: 1.71 inchesNumber of rain days: 5
APRIL
Average High: 81.7°FAverage Low: 72.2°F
Record High: 90.0°FRecord Low: 48.0°F
Average Precipitation: 1.75 inchesNumber of rain days: 5
MAY
Average High: 85.1°FAverage Low: 76.1°F
Record High: 91.0°FRecord Low: 64.0°F
Average Precipitation: 3.46 inchesNumber of rain days: 8
JUNE
Average High: 87.6°FAverage Low: 78.5°F
Record High: 94.0°FRecord Low: 68.0°F
Average Precipitation: 5.09 inchesNumber of rain days: 11
JULY
Average High: 89.1°FAverage Low: 79.6°F
Record High: 95.0°FRecord Low: 69.0°F
Average Precipitation: 3.61 inchesNumber of rain days: 12
AUGUST
Average High: 89.2°FAverage Low: 79.3°F
Record High: 95.0°FRecord Low: 68.0°F
Average Precipitation: 5.03 inchesNumber of rain days: 14
SEPTEMBER
Average High: 88.0°FAverage Low: 78.5°F
Record High: 94.0°FRecord Low: 69.0°F
Average Precipitation:Number of rain days: 16
OCTOBER
Average High: 84.4°FAverage Low: 75.5°F
Record High: 93.0°FRecord Low: 60.0°F
Average Precipitation: 4.42 inchesNumber of rain days: 11
NOVEMBER
Average High: 80.0°FAverage Low: 71.2°F
Record High: 89.0°FRecord Low: 49.0°F
Average Precipitation: 2.84 inchesNumber of rain days: 7
DECEMBER
Average High: 76.1°FAverage Low: 66.8°F
Record High: 86.0°FRecord Low: 44.0°F
Average Precipitation: 2.02 inchesNumber of rain days: 7

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