Hourly Weather Forecast - Copper Cliff, Ontario, CA

12 AM
30°F
30%
8mph
SSW
30% Chance Frozen Mix
Humidity
100%
Feels like
22°F
Dew Point
30°F
1 AM
30°F
30%
8mph
SSW
30% Chance Frozen Mix
Humidity
100%
Feels like
22°F
Dew Point
30°F
2 AM
30°F
40%
8mph
SSW
40% Chance of Flurries
Humidity
100%
Feels like
22°F
Dew Point
30°F
3 AM
30°F
40%
9mph
SW
40% Chance of Flurries
Humidity
100%
Feels like
22°F
Dew Point
30°F
4 AM
30°F
40%
9mph
SW
40% Chance of Flurries
Humidity
100%
Feels like
22°F
Dew Point
30°F
5 AM
30°F
40%
9mph
WSW
40% Chance of Flurries
Humidity
100%
Feels like
22°F
Dew Point
30°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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