Hourly Weather Forecast - Thornton, Ontario, CA

12 AM
17°F
10%
5mph
N
Mostly Clear
Humidity
77%
Feels like
10°F
Dew Point
11°F
1 AM
17°F
10%
4mph
NNE
Partly Cloudy
Humidity
77%
Feels like
10°F
Dew Point
11°F
2 AM
17°F
10%
4mph
NNE
Partly Cloudy
Humidity
78%
Feels like
10°F
Dew Point
11°F
3 AM
17°F
10%
4mph
NE
Partly Cloudy
Humidity
79%
Feels like
10°F
Dew Point
11°F

Rain And Snow Totals Through Monday

Atmospheric River Impacts Northern California

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

NOAA, NCDC

White Christmas? What Are The Odds

Today's Weather Outlook

Today's 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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