Monthly Historical AveragesFullerton, CA
Average Temperature
High
19°
Feels 19
Low
8°
Feels 7
Average Precipitation
6 Days
49.7mm
0cm
Content continues below
Daily Historical Averages
S
M
T
W
T
F
S
ForecastTuesday, December 30, 2025
Day
24°Feels 24
Wind
24 km/h NE
Gust
36 km/h
Humidity
22%
P.O.P
30%
Night
16°Feels 16
Wind
21 km/h NE
Gust
31 km/h
Humidity
56%
P.O.P
30%
Historical AveragesDec 30
High
Feels
Low
Feels
Precip Frequency
Total Daylight
Humidity