Key West (FL) monthly weather averages

  • Average daytime temperature

    The bar chart below shows the average monthly peak daytime temperatures at Key West

    Key West average temperature chart (Celsius) Key West average temperature chart (Fahrenheit)
    Average monthly temperatures in Key West (degrees centigrade and fahrenheit)
      Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
    °C 23.4 23.7 25.8 27.5 29.2 30.8 31.6 31.8 31.1 29.1 26.4 24.2
    °F 74.2 74.7 78.4 81.6 84.6 87.4 88.9 89.2 88.1 84.4 79.5 75.6

    Please note: these are the average peak daytime temperatures (usually around mid-afternoon) so do not show daytime / night highs and lows. To see the daily range of temperatures have a look at the temperature max / min chart below.

  • Average rainfall & rainy days

    The graph below shows the average rainfall and number of rainy days per month.

    Key West monthly rainfall chart (mm) Key West monthly rainfall chart (inches)
    Average monthly rainfall in Key West (mm and inches)
      Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
    mm 47 48 40 46 107 144 104 125 166 116 51 45
    inches 1.8 1.9 1.6 1.8 4.2 5.7 4.1 4.9 6.5 4.5 2 1.8
    Rainy days 6 6 5 4 8 12 12 15 16 11 7 6
  • Average daily sunshine

    The bar chart below shows the average daily sunshine hours in Key West

    Key West average daily sunshine chart
    Average daily sunshine Key West
      Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
    Hrs sunshine 8.5 9.1 10.3 11.2 11.3 10.8 10.9 10.3 9.5 8.8 8.2 8
  • Day / night temperatures

    The graph below shows the daily range of temperatures for each month.

    Key West average minimum / maximum temperatures (Celsius) Key West average minimum / maximum temperatures (Fahrenheit)
    Maximum and minimum daily temperatures in Key West (degrees centigrade and fahrenheit)
      Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
    Min °C 17 17.4 19.5 21.3 23.3 24.9 25.5 25.5 24.9 23.2 20.5 18
    Max °C 23.6 23.9 26 27.7 29.4 30.9 31.8 32 31.3 29.3 26.6 24.4
    Min °F 62.6 63.2 67 70.3 73.9 76.8 77.8 77.8 76.8 73.7 68.8 64.4
    Max °F 68.5 69.1 72.9 76.1 79.3 82.2 83.5 83.7 82.6 79.2 74.3 70.2
  • Sea temperature

    The graph below shows the average sea temperature.

    Key West average sea temperature chart (Celsius) Key West average sea temperature chart (Fahrenheit)
    Average sea temperature around Key West in degrees centigrade and fahrenheit
      Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
    °C 23.9 23.5 23.9 25.2 26.9 28.6 29.5 29.9 29.4 28.2 26.4 25
    °F 75 74.3 75.1 77.3 80.3 83.5 85.2 85.8 85 82.7 79.4 77
  • Wind speed

    The graph below shows the average wind speed.

    Key West average winspeed by month (km/h) Key West average winspeed by month (mph)
    Average wind speed in Key West (mph and kmh)
      Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
    km/h 18 18 19 18 16 14 14 14 14 16 18 17
    mph 11 11 12 11 10 9 9 9 9 10 11 11

    A monthly average windspeed of over 16km/h or 10mph suggests a location is fairly windy.

  • Relative humidity

    The graph below shows the average relative humidity.

    Key West relative humidity averages
    Average relative humidity in Key West
    Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
    76% 74% 73% 70% 73% 75% 73% 74% 76% 76% 76% 76%

Other monthly averages

UV index Best time to go?

Key West weather stats

Key West weather statistics
Hottest month: August 31.8°C 89.2°F
Driest month: March 40mm 1.6ins
Sunniest month: April 11.2hrs
Coldest month: January 23.4°C 74.1°F
Wettest month: September 166mm 6.5ins
Warmest sea: August 29.9°C 85.8°F
Map showing location of Key West (24.5557, -81.78259)

Top United States locations

Change units