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Fullerton, California Weather:
Wednesday, December 31, 2025
Cloudy Weather
Day 66°
Night 45°
Precipitation 20 %
Wind 1 mph
UV Index (0 - 11+) 3
Weather Forecast History
Last Year's Weather on This Day (December 31, 2024)
Partly Sunny with Showers

Day

63°

Night

43°

Wind

4 mph

UV Index

2

Precipitation

55 %