April weather forecast and climate
San Juan, PR

An old fort building and a yonder view of the stunning San Juan city, Puerto Rico, with a clear view of the calm waterfront
An old fort building and a yonder view of the stunning San Juan city, Puerto Rico, with a clear view of the calm waterfront
Average temperature in April - San Juan, PR
  • Average high temperature in April: 30.1°C

Warmest months (with the highest average high temperature) are August and September (31.8°C).
The month with the lowest average high temperature is January (28.4°C).

  • Average low temperature in April: 23.6°C

The month with the highest average low temperature is August (25.7°C).
Coldest months (with the lowest average low temperature) are January and February (22.2°C).

Average humidity in April - San Juan, PR
  • Average humidity in April: 71.3%

The month with the highest relative humidity is October (76.9%).
The month with the lowest relative humidity is March (71%).

Average rainfall in April - San Juan, PR
  • Average rainfall in April: 121mm

The wettest month (with the highest rainfall) is August (195mm).
The driest month (with the lowest rainfall) is March (79mm).

Average rainfall days in April - San Juan, PR
  • Average rainfall days in April: 13.3 days

Months with the highest number of rainy days are November and December (19.6 days).
The month with the lowest number of rainy days is March (12.2 days).

Average sea temperature in April - San Juan, PR
  • Average sea temperature in April: 26.9°C

The best month for swimming (with the highest average sea temperature) is September (29.4°C).
Coldest months (with the lowest average sea temperature) are February and March (26.1°C).

Average daylight in April / Average sunshine in April - San Juan, PR
  • Average daylight in April: 12.6h

The month with the longest days is June (Average daylight: 13.2h).
The month with shortest days is December (Average daylight: 11h).

  • Average sunshine in April: 8.9h

Months with most sunshine are March and July (Average sunshine: 9.1h).
The month with least sunshine is November (Average sunshine: 6.7h).

Average UV index in April - San Juan, PR
  • Average UV index in April: 12

Months with the highest UV index are March, April, May, June, July, August and September (UV index 12).
Months with the lowest UV index are January and December (UV index 8).

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