Key West Temperatures: Averages by Month





The numbers here tell you how hot and cold the weather usually is in Key West, Florida during each month of the year.

The average high and low temperatures are listed below by month and annually for Key West, in both degrees Fahrenheit and Celsius.

Maximums and minimums are only part of the temperature picture. To fill in the rest, there's information on how many days a month get above or below a given temperature.

To find out how often it rises over 70, 80 or 90 °F each month in Key West, scroll down farther. There are also monthly and yearly counts of nights with warm temperatures.

The first set of high and low temperatures are averages for 2010 to 2019. Everything else here is based on 1991 to 2020 weather.

10-year temperature averages for Key West, 2010 to 2019
High °F Low °F   High °C Low °C
75 65 January 24 18
77 68 February 25 20
78 69 March 26 20
83 74 April 28 23
85 77 May 30 25
88 80 June 31 26
89 81 July 32 27
90 81 August 32 27
88 80 September 31 27
85 77 October 30 25
81 72 November 27 22
78 69 December 26 21
83 74 Year 28 24
30-year temperature averages for Key West, 1991 to 2020
High °F Low °F   High °C Low °C
76 66 January 24 19
77 67 February 25 20
80 69 March 26 21
83 73 April 28 23
86 76 May 30 25
89 79 June 32 26
90 81 July 32 27
91 81 August 33 27
89 79 September 32 26
86 77 October 30 25
81 72 November 27 22
78 68 December 25 20
84 74 Year 29 23

Days of Hot Weather in Key West

It's not normal for the temperature to rise above 100 °F (38 °C) in Key West. But it does climb into the 90s for much of July and August. Even during winter months, Key West usually has many days of 80-degree weather.

Days per month in Key West of at least 70, 80 or 90 °F
  70 °F
21 °C
80 °F
27 °C
90 °F
32 °C
January 26 8 0
February 25 11 0
March 29 17 0
April 30 25 0
May 31 30 1
June 30 30 7
July 31 31 18
August 31 31 20
September 30 30 10
October 31 30 1
November 30 20 0
December 28 13 0
Year 352 274 57

Number of Warm Nights a Month

Nights at Key West are consistently warm, staying above 50 °F nearly throughout the year. From June to September, the temperature normally never gets any colder than 70 degrees.

Average number of days monthly in Key West that stay above 50, 60 or 70 °F
  50 °F
10 °C
60 °F
16 °C
70 °F
21 °C
January 30 24 7
February 28 24 9
March 31 28 14
April 30 30 22
May 31 31 29
June 30 30 30
July 31 31 31
August 31 31 31
September 30 30 30
October 31 31 30
November 30 29 20
December 31 27 12
Year 363 346 265
References

Jay Lawrimore, Ron Ray, Scott Applequist, Bryant Korzeniewski, Matthew Menne. 2016. Global Summary of the Month and Year, Version 1.0. NOAA National Centers for Environmental Information.

NOAA National Centers for Environmental Information (NCEI). Climate Normals.

Key West Weather
Back to Top