Hourly Weather Forecast - Fullerton, CA

9 AM
55°F
0%
2mph
ESE
Partly Cloudy
Humidity
92%
Feels like
55°F
Dew Point
53°F
10 AM
56°F
0%
2mph
SE
Partly Cloudy
Humidity
87%
Feels like
56°F
Dew Point
53°F
11 AM
58°F
0%
3mph
S
Partly Cloudy
Humidity
83%
Feels like
58°F
Dew Point
53°F
12 PM
59°F
0%
3mph
SSW
Partly Cloudy
Humidity
79%
Feels like
59°F
Dew Point
53°F
1 PM
61°F
0%
4mph
SW
Partly Cloudy
Humidity
77%
Feels like
61°F
Dew Point
53°F
2 PM
61°F
0%
4mph
SW
Partly Cloudy
Humidity
77%
Feels like
61°F
Dew Point
54°F
3 PM
60°F
0%
4mph
SW
Partly Cloudy
Humidity
81%
Feels like
60°F
Dew Point
54°F
4 PM
58°F
0%
4mph
SW
Partly Cloudy
Humidity
89%
Feels like
58°F
Dew Point
55°F
4:46 PM
5 PM
56°F
0%
3mph
SW
Hazy
Humidity
94%
Feels like
56°F
Dew Point
55°F
6 PM
55°F
0%
2mph
SW
Hazy
Humidity
98%
Feels like
55°F
Dew Point
55°F
7 PM
55°F
0%
2mph
SSW
Foggy
Humidity
99%
Feels like
55°F
Dew Point
55°F
8 PM
55°F
0%
1mph
SSE
Foggy
Humidity
99%
Feels like
55°F
Dew Point
55°F
9 PM
55°F
0%
1mph
ESE
Foggy
Humidity
99%
Feels like
55°F
Dew Point
55°F
10 PM
55°F
0%
2mph
E
Foggy
Humidity
100%
Feels like
55°F
Dew Point
55°F
11 PM
55°F
0%
2mph
ENE
Foggy
Humidity
100%
Feels like
55°F
Dew Point
55°F

Rain And Snow Totals Through Monday

Atmospheric River Takes Aim For Northern California

The plume of abundant moisture impacting the Northwest the last several days will focus more on Northern California later today into Monday bringing heavy rainfall and mountain snow.

NOAA, NCDC

White Christmas? What Are The Odds

Weekend Weather Outlook

Weekend Weather Outlook

Cold weather

During Extreme Cold: Watch for Frostbite!

Flu Update Valid For Week Ending December 13, 2025

Weekly Flu Update: Flu Spreading Hard Across U.S.

Watch vs. Warning

Flash Flood Watch and Warning Defined

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