Hourly Weather Forecast - Thornton, Ontario, CA

12 AM
19°F
10%
5mph
ENE
Mostly Clear
Humidity
77%
Feels like
11°F
Dew Point
12°F
1 AM
18°F
10%
5mph
ENE
Partly Cloudy
Humidity
80%
Feels like
10°F
Dew Point
13°F
2 AM
18°F
10%
5mph
ENE
Partly Cloudy
Humidity
81%
Feels like
10°F
Dew Point
13°F
3 AM
18°F
10%
5mph
ENE
Partly Cloudy
Humidity
82%
Feels like
10°F
Dew Point
13°F
4 AM
18°F
10%
5mph
E
Partly Cloudy
Humidity
84%
Feels like
11°F
Dew Point
14°F
5 AM
18°F
10%
5mph
E
Mostly Cloudy
Humidity
85%
Feels like
11°F
Dew Point
15°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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