San Mateo, California Weather:
Sunday, September 27, 2026
Sunny Weather
Day 72°
Night 55°
Precipitation 20 %
Wind 6 mph
UV Index (0 - 11+) 5
Weather Forecast History
Last Year's Weather on This Day (September 27, 2025)
Cloudy Night

Day

73°

Night

63°

Wind

8 mph

Precipitation

25 %