San Juan monthly weather averages

Contents

Average daytime temperature

The bar chart below shows the average monthly peak daytime temperatures at San Juan

San Juan average temperature chart (Celsius) San Juan average temperature chart (Fahrenheit)
Average monthly temperatures in San Juan (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 19.5 18.9 19 19.2 19.6 19.4 19.3 19.9 19.7 19.7 20.2 20
°F 67.1 66 66.2 66.6 67.3 66.9 66.7 67.9 67.4 67.4 68.4 68.1

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.

San Juan monthly rainfall chart (mm) San Juan monthly rainfall chart (inches)
Average monthly rainfall in San Juan (mm and inches)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
mm 94 103 126 81 38 15 11 14 38 94 74 81
inches 3.7 4.1 5 3.2 1.5 0.6 0.4 0.6 1.5 3.7 2.9 3.2
Rainy days 14 18 18 15 10 5 4 4 10 10 9 13

Average annual rainfall in San Juan: 682.933mm (268.9 inches)

Average daily sunshine

The bar chart below shows the average daily sunshine hours in San Juan

San Juan average daily sunshine chart
Average daily sunshine San Juan
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Hrs sunshine 5.1 4.8 4.5 5.2 6.5 6.8 7.5 6.8 5.5 5.5 6.6 5.8

Day / night temperatures

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

San Juan average minimum / maximum temperatures (Celsius) San Juan average minimum / maximum temperatures (Fahrenheit)
Maximum and minimum daily temperatures in San Juan (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Min °C 7.6 7.5 7.5 7.3 6.9 6.1 5.8 6.6 7 7 7.1 7.1
Max °C 19.8 19.2 19.3 19.5 20 19.7 19.6 20.3 20 20 20.6 20.4
Min °F 45.7 45.4 45.5 45.1 44.3 43 42.4 43.8 44.6 44.6 44.7 44.7
Max °F 56.7 55.9 56.1 56.1 56.1 55.2 54.9 56.1 56.3 56.3 56.8 56.7

Sea temperature

The graph below shows the average sea temperature.

San Juan average sea temperature chart (Celsius) San Juan average sea temperature chart (Fahrenheit)
Average sea temperature around San Juan in degrees centigrade and fahrenheit
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 21.9 23.1 22.9 21.3 20.3 19.6 18.8 18.3 17.8 18 18.9 20.3
°F 71.5 73.6 73.2 70.3 68.5 67.2 65.9 64.9 64.1 64.4 66 68.5

Wind speed

The graph below shows the average wind speed.

San Juan average winspeed by month (km/h) San Juan average winspeed by month (mph)
Average wind speed in San Juan (mph and kmh)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
km/h 14 13 14 13 13 13 13 14 14 14 14 16
mph 9 8 9 8 8 8 8 9 9 9 9 10

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.

San Juan relative humidity averages
Average relative humidity in San Juan
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
73% 76% 78% 78% 73% 69% 63% 60% 66% 69% 66% 69%

Other monthly averages

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Beta

Current (hourly) weather 15 day forecast

San Juan weather stats

San Juan weather statistics
Hottest month: November 20.2°C 68.4°F
Driest month: July 11mm 0.4ins
Sunniest month: July 7.5hrs
Coldest month: July 19.3°C 66.7°F
Wettest month: March 126mm 5ins
Warmest sea: February 23.1°C 73.6°F
Map showing location of San Juan (-7.3, -78.5) San Juan map pin © Google

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