Hourly Weather Forecast - Port Costa, CA

12 AM
47°F
60%
10mph
S
60% Chance of Light Rain
Humidity
90%
Feels like
43°F
Dew Point
45°F
1 AM
47°F
60%
10mph
SSW
60% Chance of Light Rain
Humidity
92%
Feels like
42°F
Dew Point
45°F
2 AM
47°F
60%
10mph
SSW
60% Chance of Light Rain
Humidity
93%
Feels like
42°F
Dew Point
45°F
3 AM
47°F
60%
10mph
SSW
60% Chance of Light Rain
Humidity
94%
Feels like
42°F
Dew Point
45°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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