Hourly Weather Forecast - Port Costa, CA

12 AM
49°F
0%
6mph
SSW
Cloudy
Humidity
93%
Feels like
47°F
Dew Point
47°F
1 AM
49°F
0%
6mph
SSW
Cloudy
Humidity
94%
Feels like
47°F
Dew Point
48°F
2 AM
50°F
10%
6mph
SSW
Cloudy
Humidity
94%
Feels like
47°F
Dew Point
48°F
3 AM
50°F
10%
6mph
SSW
Cloudy
Humidity
93%
Feels like
50°F
Dew Point
48°F
4 AM
50°F
0%
6mph
SSW
Cloudy
Humidity
94%
Feels like
50°F
Dew Point
49°F
5 AM
49°F
0%
6mph
SSW
Cloudy
Humidity
95%
Feels like
47°F
Dew Point
48°F
6 AM
50°F
10%
6mph
SSW
Cloudy
Humidity
95%
Feels like
47°F
Dew Point
48°F
7 AM
50°F
10%
7mph
SSW
Cloudy
Humidity
96%
Feels like
50°F
Dew Point
49°F
7:20 AM
8 AM
51°F
10%
7mph
SSW
Cloudy
Humidity
94%
Feels like
51°F
Dew Point
50°F
9 AM
53°F
20%
8mph
SSW
Mostly Cloudy
Humidity
92%
Feels like
53°F
Dew Point
51°F
10 AM
53°F
10%
8mph
SSW
Mostly Cloudy
Humidity
91%
Feels like
53°F
Dew Point
51°F
11 AM
54°F
10%
9mph
SSW
Mostly Cloudy
Humidity
91%
Feels like
54°F
Dew Point
51°F
12 PM
55°F
10%
9mph
SW
Mostly Cloudy
Humidity
90%
Feels like
55°F
Dew Point
52°F
1 PM
55°F
10%
9mph
SW
Cloudy
Humidity
88%
Feels like
55°F
Dew Point
51°F
2 PM
54°F
10%
9mph
SW
Cloudy
Humidity
89%
Feels like
54°F
Dew Point
51°F
3 PM
53°F
10%
9mph
SSW
Cloudy
Humidity
92%
Feels like
53°F
Dew Point
50°F
4 PM
51°F
10%
9mph
SSW
Cloudy
Humidity
97%
Feels like
51°F
Dew Point
50°F
4:51 PM
5 PM
50°F
10%
9mph
SSW
Cloudy
Humidity
98%
Feels like
46°F
Dew Point
49°F
6 PM
50°F
20%
9mph
SSW
Cloudy
Humidity
98%
Feels like
46°F
Dew Point
49°F
7 PM
50°F
30%
10mph
SSW
30% Chance of Light Rain
Humidity
96%
Feels like
50°F
Dew Point
49°F
8 PM
51°F
30%
10mph
SSW
30% Chance of Light Rain
Humidity
96%
Feels like
51°F
Dew Point
50°F
9 PM
51°F
40%
10mph
SSW
40% Chance of Light Rain
Humidity
96%
Feels like
51°F
Dew Point
50°F
10 PM
52°F
40%
10mph
SSW
40% Chance of Light Rain
Humidity
94%
Feels like
52°F
Dew Point
50°F
11 PM
52°F
40%
10mph
SSW
40% Chance of Light Rain
Humidity
95%
Feels like
52°F
Dew Point
51°F

Rainfall Totals Through Wednesday A.M.

Heavy Rain Returns to Deluge Pacific Northwest

Another atmospheric river will hit the Pacific Northwest with heavy rain and high winds.

Monday's Weather Outlook

Today's Weather Outlook

How to Measure Snow via NWS

How To Measure Snow

Weekly Drought Map for December 11, 2025

Hit-or-Miss Precipitation Leads to Mixed Drought Results

A person standing in a snowy forest with their back to the camera. They are bundled up in a white hat and a brown jacket. (Image by StockSnap from Pixabay)

Common Cold Weather Illnesses

A strong cold-air-damming event from March 20, 2018.

Cold Air Damming - Cause And Effects

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