Fullerton, California Weather:
Thursday, September 17, 2026
Cloudy Weather
Day 84°
Night 63°
Precipitation 1 %
Wind 7 mph
UV Index (0 - 11+) 7
Weather Forecast History
Last Year's Weather on This Day (September 17, 2025)
Rainy Weather

Day

90°

Night

68°

Wind

5 mph

Precipitation

75 %