Fullerton, California Weather:
Thursday, May 21, 2026
Partly Sunny with Showers
Day 70°
Night 55°
Precipitation 1 %
Wind 4 mph
Weather Forecast History
Last Year's Weather on This Day (May 21, 2025)
Sunny Weather

Day

90°

Night

59°

Wind

6 mph

UV Index

11

Precipitation

1 %