Cayo Guillermo monthly weather averages

Average daytime temperature

The bar chart below shows the average monthly peak daytime temperatures at Cayo Guillermo

Cayo Guillermo average temperature chart (Celsius) Cayo Guillermo average temperature chart (Fahrenheit)
Average monthly temperatures in Cayo Guillermo (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 26.8 27.7 28.9 30.3 31 31.8 32.7 32.8 32.1 30.5 29 27.6
°F 80.3 81.9 84 86.5 87.8 89.2 90.8 91.1 89.8 87 84.2 81.7

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.

Cayo Guillermo monthly rainfall chart (mm) Cayo Guillermo monthly rainfall chart (inches)
Average monthly rainfall in Cayo Guillermo (mm and inches)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
mm 45 43 52 59 166 154 82 111 156 183 87 40
inches 1.8 1.7 2 2.3 6.6 6.1 3.2 4.4 6.2 7.2 3.4 1.6
Rainy days 7 6 6 5 12 15 13 15 15 16 9 7

Average daily sunshine

The bar chart below shows the average daily sunshine hours in Cayo Guillermo

Cayo Guillermo average daily sunshine chart
Average daily sunshine Cayo Guillermo
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Hrs sunshine 7.6 7.9 8.7 9.1 8.2 7.5 8.7 8.4 7.4 7.2 7.5 7.4

Day / night temperatures

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

Cayo Guillermo average minimum / maximum temperatures (Celsius) Cayo Guillermo average minimum / maximum temperatures (Fahrenheit)
Maximum and minimum daily temperatures in Cayo Guillermo (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Min °C 17.2 17.6 18.4 19.2 21.1 22.7 23.2 23.2 22.6 22 20.5 18.5
Max °C 27.1 28 29.1 30.5 31.2 32 32.9 33.1 32.4 30.8 29.2 27.9
Min °F 63 63.6 65.1 66.5 69.9 72.9 73.8 73.7 72.6 71.5 68.9 65.2
Max °F 71.9 73 74.8 76.7 79.1 81.2 82.5 82.6 81.4 79.4 76.7 73.7

Sea temperature

The graph below shows the average sea temperature.

Cayo Guillermo average sea temperature chart (Celsius) Cayo Guillermo average sea temperature chart (Fahrenheit)
Average sea temperature around Cayo Guillermo in degrees centigrade and fahrenheit
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 25.1 25 25.4 26.3 27.4 28.7 29.3 29.7 29.6 28.8 27.1 25.9
°F 77.2 77 77.7 79.3 81.3 83.7 84.8 85.4 85.3 83.8 80.8 78.6

Wind speed

The graph below shows the average wind speed.

Cayo Guillermo average winspeed by month (km/h) Cayo Guillermo average winspeed by month (mph)
Average wind speed in Cayo Guillermo (mph and kmh)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
km/h 14 14 15 14 12 11 12 12 10 11 13 13
mph 8 9 9 9 8 7 8 7 6 7 8 8

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.

Cayo Guillermo relative humidity averages
Average relative humidity in Cayo Guillermo
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
81% 79% 78% 75% 79% 81% 79% 80% 83% 84% 84% 83%
Cayo Guillermo

Other monthly averages

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Cayo Guillermo weather stats

Cayo Guillermo weather statistics
Hottest month: August 32.8°C 91°F
Driest month: December 40mm 1.6ins
Sunniest month: March 8.7hrs
Coldest month: January 26.8°C 80.2°F
Wettest month: October 183mm 7.2ins
Warmest sea: August 29.7°C 85.5°F
Map showing location of Cayo Guillermo (22.595, -78.66639)

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