Key West, FL Climate

Summary Graph

The summary climate graph for Key West, FL shows a selection of temperature, rainfall and snow minimum, mean and maximum measures over the course of a year. Click on each of the measures in the key to toggle them on and off.

Graph of average and extreme temperature ranges by day for Key West, FL.


The warmest month in Key West International, Key West, Florida is August with an average high temperature of 89.9°F. The hottest day on record was September 14 1980 when the temperature hit 102.9°F. During January the overnight temperature drops to an average of 63.7°F with the lowest temperature of 41.0°F being recorded on January 18 1981.

Warmest Days

Warmest Months

Coldest Days

Coldest Months

The warmest days on record are:

14 Sep 1980102.9°F
28 Sep 1979100.9°F
1 Aug 1988100.9°F
24 Jul 197798.1°F
11 May 199698.1°F

The warmest months on average were:

August 200792.6°F
August 199092.3°F
July 200791.9°F
July 200991.9°F
August 198991.5°F

The coldest days on record are:

18 Jan 198141°F
12 Jan 201042.1°F
27 Dec 198544.1°F
25 Dec 198944.1°F
24 Jan 200344.6°F

The coldest months on average were:

January 198153.5°F
February 197856.2°F
January 200356.2°F
December 201056.4°F
January 200156.7°F


The wettest month by average rainfall in Key West, FL is October with an average of 6.3 inches of rain falling on 11 to 12 days.Although in August it typically rains on more days with 5.6 inches falling in 15 to 16 days. The driest month by average rainfall in Key West, FL is February with an average of 1.8 inches of rain falling on 6 to 7 days. Although in April it typically rains on less days with 3.7 inches falling in 5 to 6 days

Wettest Days

The wettest days on record are:

16 March 197417.1 inches
18 March 19737.9 inches
7 March 19875.3 inches
2 March 19792.1 inches
4 March 20052 inches

Wettest Months

The wettest months on record are:

April 197459.5 inches
January 197457.9 inches
October 197448.6 inches
November 197339.7 inches
March 197437.6 inches

Driest Months

The driest months on record are:

January 19900 inches
April 19980 inches
November 19950 inches
April 20060 inches
April 19880 inches