Our weather is one of our biggest filming selling points, as well as phenomenal scenic beauty! The average annual temperature is 68 degrees with winter lows in the mid 50s. Average rainfall is approximately 20 inches per year and 80% of the annual rainfall occurs between November and March. But, remember the temperature, precipitation, wind and fog in San Mateo County can vary widely between the Coastside (Pacific Ocean) and the bay side (San Francisco Bay) of the Peninsula.