San Rafael Weather & Climate: Best Time to Visit

The climate in San Rafael remains fairly constant, offering pleasant temperatures throughout the year. On average, daytime temperatures range from a pleasant 19°C (66°F) in September to a moderate 18°C (64°F) in July.

Nighttime temperatures range from 9°C (48°F) in September to 8°C (46°F) in July.

Check out our detailed temperature page for more information.

Temperature ranges by month

San Rafael is known for its substantial rainfall, with annual precipitation reaching 1977 mm (78 in). The seasons in San Rafael bring significant changes in precipitation. The wettest month, April, receives heavy rainfall, with an average of 259 mm (10 in) of precipitation. This rainfall is distributed across 19 rainy days.

In contrast, the driest month, August, experiences much less rainfall, totaling 52 mm (2 in) over 9 rainy days. These distinct seasonal differences provide diverse experiences throughout the year. For more details, please visit our San Rafael Precipitation page.

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

The average number of days each month with precipitation

In San Rafael, summer days are longer and more sunny, with daily sunshine hours peaking at 8.6 hours in August. As the darker season arrives, the brightness of the sun becomes less. March sees a soft sun for only 4.1 hours per average day.

Visit our detailed sunshine hours page for more information.

Monthly hours of sunshine

Daily hours of sunshine

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

The city experiences its highest humidity in April, reaching 84%. In August, the humidity drops to its lowest level at 69%. What does this mean? Read our detailed page on humidity levels for further details.

Relative humidity over the year