Weather San Francisco 2025 Season. In san francisco, in may, during 4 rainfall days, 0.35 (9mm) of precipitation is typically accumulated. Discover the most accurate weather forecast for san francisco in january 2025.

Weather.com brings you the most accurate monthly weather forecast for san francisco, ca with average/record and high/low temperatures, precipitation and more. Transporting the colder airmass of this season so far.