San Juan monthly weather averages

  • Average daytime temperature

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

    San Juan average temperature chart
    Average monthly temperatures in San Juan (degrees centigrade and fahrenheit)
      Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
    °C 26.7 26.9 27.5 28.3 29.3 30 29.9 30.2 30.2 29.9 28.5 27.3
    °F 80.1 80.4 81.5 83 84.7 86 85.8 86.3 86.4 85.8 83.4 81.2

    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.

    Average monthly rainfall in San Juan (mm and inches)
      Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
    mm 116 82 79 121 182 152 180 195 188 171 178 151
    inches 4.5 3.2 3.1 4.8 7.1 6 7.1 7.7 7.4 6.7 7 5.9
    Rainy days 20 15 15 14 16 17 19 20 18 18 19 21
  • Average daily sunshine

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

    Average daily sunshine San Juan
      Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
    Hrs sunshine 8.3 8.8 9.6 9.4 8.7 9.1 9.5 9.2 8.3 7.8 7.3 7.6
  • Day / night temperatures

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

    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 20.1 19.8 20.6 21.3 22.4 23.3 23.6 23.7 23.4 23 22.1 21.1
    Max °C 26.9 27.1 27.7 28.5 29.5 30.2 30.1 30.4 30.4 30.1 28.7 27.5
    Min °F 68.2 67.6 69 70.3 72.2 73.9 74.4 74.6 74.1 73.3 71.8 70
    Max °F 74.3 74.1 75.4 76.8 78.6 80.1 80.2 80.6 80.4 79.7 77.7 75.7
  • Sea temperature

    The graph below shows the average sea temperature.

    Average sea temperature around San Juan in degrees centigrade and fahrenheit
      Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
    °C 26.6 26.2 26.2 26.7 27.5 28.1 28.4 28.7 29 28.9 28.3 27.3
    °F 79.9 79.2 79.2 80.1 81.4 82.6 83 83.7 84.2 84 82.9 81.2
  • Wind speed

    The graph below shows the average wind speed.

    Average wind speed in San Juan (mph and kmh)
      Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
    km/h 16 17 16 16 15 16 17 16 14 13 15 16
    mph 10 10 10 10 9 10 11 10 9 8 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.

    Average relative humidity in San Juan
    Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
    75% 73% 72% 72% 76% 76% 76% 77% 77% 77% 77% 75%

Other monthly averages

San Juan weather stats

San Juan weather statistics
Hottest month: August 30.2°C 86.4°F
Driest month: March 79mm 3.1ins
Sunniest month: March 9.6hrs
Coldest month: February 26.9°C 80.4°F
Wettest month: August 195mm 7.7ins
Warmest sea: September 29°C 84.2°F
Map showing location of San Juan (18.46633, -66.10572)

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