San Francisco Precipitation: Average Monthly Rainfall and Snowfall

This graph shows the average amount of rainfall per month in San Francisco (Riviera Nayarit). The numbers are calculated over a 30-year period to provide a reliable average.

• A lot of rain (rainy season) falls in the months: June, July, August, September and October.
• San Francisco has dry periods in February, March, April and May.
• On average, September is the wettest month with 254 mm of precipitation.
• On average, April is the driest month with 2 mm of precipitation.
• The average amount of annual precipitation is 1002 mm.