San Juan Weather & Climate: Best Time to Visit

The climate in San Juan is known for significant temperature differences throughout the year, making the weather dynamic. Typically, average maximum daytime temperatures range from a very warm 33°C (91°F) in January to a moderate 18°C (64°F) in the coolest month, July.

Nights vary from 19°C (66°F) in January to around 2°C (36°F) during the colder months.

Check out our detailed temperature page for more information.

Temperature ranges by month

San Juan has a relatively dry climate with low precipitation, averaging 324 mm (13 in) of rain/snowfall annually. The climate in San Juan shows significant variation throughout the year. Expect moderate rainfall in December, the wettest month, with an average of 40 mm (1.6 in) of precipitation over 4 rainy days.

In contrast, the driest month June offers drier and sunnier days, with around 12 mm (0.5 in) of rainfall over a single rainy day. 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

For those who appreciate different seasons, San Juan serves as an ideal destination. Expect longer, more sun-filled days in December with an average of 11.7 hours of sunshine daily, and embrace the darker days in June, offering only 6.9 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 relative humidity is moderate throughout the year in San Juan.

The city experiences its highest humidity in June, reaching 63%. In October, the humidity drops to its lowest level at 38%. What does this mean? Read our detailed page on humidity levels for further details.

Relative humidity over the year