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 annual rainfall in Key West: 982.7mm (386.9 inches)

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%