San Mateo, California Weather:
Wednesday, September 23, 2026
Cloudy Weather
Day 75°
Night 59°
Precipitation 2 %
Wind 4 mph
UV Index (0 - 11+) 5
Weather Forecast History
Last Year's Weather on This Day (September 23, 2025)
Cloudy Night

Day

93°

Night

64°

Wind

7 mph

Precipitation

25 %