San Francisco, California Weather:
Thursday, May 21, 2026
Cloudy Weather
Day 70°
Night 54°
Precipitation 0 %
Wind 9 mph
UV Index (0 - 11+) 11
Weather Forecast History
Last Year's Weather on This Day (May 21, 2025)
Sunny Weather

Day

72°

Night

52°

Wind

14 mph

UV Index

11

Precipitation

1 %