San Francisco Weather 5 Day Forecast 2025 Schedule. Expect 18°c daytime maximum temperatures in the shade with on average 11 hours of sunshine per day in san francisco in may. Weather.com brings you the most accurate monthly weather forecast for san francisco, ca with average/record and high/low temperatures, precipitation and more.

Check the temperatures, chance of rain and more in san francisco during may. On the last day of may, in.