San Mateo, California Weather:
Monday, May 18, 2026
Cloudy Weather
Day 64°
Night 54°
Precipitation 0 %
Wind 8 mph
Weather Forecast History
Last Year's Weather on This Day (May 18, 2025)
Cloudy Weather

Day

73°

Night

54°

Wind

14 mph

UV Index

11

Precipitation

1 %