Islamorada Temperatures: Averages by Month





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

The average high and low temperatures are listed below monthly and annually for Upper Matecumbe Key and its neighbors, 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 at Islamorada, scroll down farther. There are also monthly and yearly counts of days with cool weather.

The first set of high and low temperatures are averages for 2007 to 2016. Everything else here is based on 1991 to 2020 weather.

10-year temperature averages for Islamorada, 2007 to 2016
High °F Low °F   High °C Low °C
75 65 January 24 18
76 66 February 24 19
78 69 March 25 20
81 73 April 27 23
84 77 May 29 25
86 79 June 30 26
88 80 July 31 27
89 80 August 32 27
87 79 September 31 26
85 77 October 29 25
79 70 November 26 21
78 69 December 25 21
82 73 Year 28 23
30-year temperature averages for Islamorada, 1991 to 2020
High °F Low °F   High °C Low °C
75 65 January 24 18
77 67 February 25 19
78 69 March 26 21
81 72 April 27 22
84 76 May 29 25
87 78 June 30 26
89 80 July 32 26
89 79 August 32 26
88 79 September 31 26
85 76 October 30 25
80 71 November 27 22
78 68 December 25 20
83 73 Year 28 23

Days of Hot Weather in Islamorada

Islamorada enjoys pleasantly hot temperatures throughout much of the year. Most days have highs in the 80s Fahrenheit. Thermometers typically reach into the 90s for 30 days annually, scattered from May to November. It normally doesn't get any hotter than 100 °F (38 °C) at this cluster of six islands in the midst of the Florida Keys.

Days per month in Islamorada of at least 70, 80 or 90 °F
  70 °F
21 °C
80 °F
27 °C
90 °F
32 °C
January 27 6 0
February 26 8 0
March 30 14 0
April 30 23 0
May 31 30 0
June 30 30 3
July 31 31 8
August 31 31 12
September 30 30 5
October 31 30 2
November 30 18 0
December 30 12 0
Year 357 261 30

How Often Islamorada Has Cool Temperatures

Cold temperatures simply don't happen at Islamorada. Even winter nights enjoy warm weather, with just five on average seeing lows of 50 °F or less. Only once every few years does the thermometer touch 40 °F (4 °C).

Days per month on average in Islamorada when the minimum temperature drops to 60 or 50 °F or lower
  50 °F
10 °C
60 °F
16 °C
January 3 11
February 1 6
March 0 4
April 0 1
May 0 0
June 0 0
July 0 0
August 0 0
September 0 0
October 0 0
November 0 2
December 1 6
Year 5 29
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.

Florida Temperatures
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