Fullerton, California Weather:
Sunday, May 31, 2026
Cloudy Weather
Day 79°
Night 63°
Precipitation 1 %
Wind 5 mph
UV Index (0 - 11+) 11
Weather Forecast History
Last Year's Weather on This Day (May 31, 2025)
Cloudy Weather

Day

90°

Night

63°

Wind

6 mph

UV Index

11

Precipitation

25 %