Hourly Weather Forecast - Grand Valley, Ontario, CA

12 AM
37°F
50%
12mph
WSW
50% Chance Frozen Mix
Humidity
86%
Feels like
29°F
Dew Point
33°F
1 AM
36°F
50%
11mph
WSW
50% Chance Frozen Mix
Humidity
89%
Feels like
28°F
Dew Point
33°F
2 AM
36°F
60%
11mph
WSW
60% Chance Frozen Mix
Humidity
91%
Feels like
28°F
Dew Point
33°F
3 AM
36°F
60%
12mph
WSW
60% Chance Frozen Mix
Humidity
90%
Feels like
28°F
Dew Point
34°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

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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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