San Juan Weather & Climate: Best Time to Visit

The temperature in San Juan remains steady throughout the year, providing a consistently very warm climate. Average maximum daytime temperatures range from a very warm 31°C (88°F) in August, the warmest time of the year, to a comfortable 28°C (82°F) during cooler months like February.

At night, you can expect temperatures ranging from 25°C (77°F) in August to around 22°C (72°F) during February.

Check out our detailed temperature page for more information.

Temperature ranges by month

San Juan has a relatively rainy climate with high precipitation levels, averaging 1192 mm (47 in) of rainfall annually. Significant seasonal changes in precipitation occur throughout the year. In the wettest month, September it receives high rainfall, averaging 159 mm (6.3 in) of precipitation, recorded across 18 rainy days. In contrast, the driest month February brings less rainfall, with 47 mm (1.9 in) over 15 rainy days. For more details, please visit our San Juan Precipitation page.

The mean monthly precipitation over the year, including rain, hail, and snow

The average number of days each month with precipitation

While the amount of sunshine in San Juan varies throughout the year, all seasons offer their own charm. Enjoy up to 9.5 hours of daily sun in March, and experience slightly darker atmosphere in November, with about 6.8 hours of daily sunlight.

Visit our detailed sunshine hours page for more information.

Monthly hours of sunshine

Daily hours of sunshine

Daily percentage of sunshine

The mean water temperature over the year ranges from 26°C (79°F) in January to 29°C (84°F) in August.

Water temperature over the year

The relative humidity is high throughout the year in San Juan.

The city experiences its highest humidity in October, reaching 77%. In March, the humidity drops to its lowest level at 71%. What does this mean? Read our detailed page on humidity levels for further details.

Relative humidity over the year

The mean wind speed over the year ranges from 2 m/s (4 knots) in October to 4 m/s (8 knots) in July. What does this mean?

The mean monthly wind speed over the year (meters per second)