Hourly Weather Forecast - Port Costa, CA

12 AM
42°F
0%
2mph
S
Mostly Cloudy
Humidity
88%
Feels like
42°F
Dew Point
39°F
1 AM
42°F
0%
3mph
S
Mostly Cloudy
Humidity
87%
Feels like
42°F
Dew Point
39°F
2 AM
44°F
0%
3mph
SSE
Mostly Cloudy
Humidity
83%
Feels like
44°F
Dew Point
39°F
3 AM
44°F
0%
2mph
SE
Mostly Cloudy
Humidity
83%
Feels like
44°F
Dew Point
40°F
4 AM
44°F
0%
3mph
ESE
Mostly Cloudy
Humidity
84%
Feels like
44°F
Dew Point
39°F
5 AM
44°F
10%
3mph
ESE
Mostly Cloudy
Humidity
83%
Feels like
44°F
Dew Point
40°F
6 AM
46°F
10%
3mph
ESE
Cloudy
Humidity
81%
Feels like
45°F
Dew Point
40°F
7 AM
46°F
10%
3mph
E
Cloudy
Humidity
83%
Feels like
46°F
Dew Point
41°F
7:18 AM
8 AM
48°F
10%
3mph
ESE
Cloudy
Humidity
81%
Feels like
48°F
Dew Point
43°F
9 AM
51°F
0%
3mph
E
Mostly Cloudy
Humidity
71%
Feels like
51°F
Dew Point
42°F
10 AM
53°F
0%
3mph
E
Cloudy
Humidity
67%
Feels like
53°F
Dew Point
43°F
11 AM
55°F
0%
4mph
ESE
Cloudy
Humidity
67%
Feels like
55°F
Dew Point
44°F
12 PM
58°F
0%
4mph
ESE
Mostly Cloudy
Humidity
64%
Feels like
58°F
Dew Point
46°F
1 PM
60°F
10%
3mph
ESE
Mostly Cloudy
Humidity
63%
Feels like
60°F
Dew Point
47°F
2 PM
58°F
10%
2mph
SE
Mostly Cloudy
Humidity
69%
Feels like
58°F
Dew Point
48°F
3 PM
57°F
10%
2mph
SSW
Mostly Cloudy
Humidity
73%
Feels like
57°F
Dew Point
48°F
4 PM
53°F
10%
3mph
SW
Mostly Cloudy
Humidity
90%
Feels like
53°F
Dew Point
50°F
4:50 PM
5 PM
51°F
10%
4mph
SW
Mostly Cloudy
Humidity
89%
Feels like
51°F
Dew Point
48°F
6 PM
50°F
10%
4mph
WSW
Cloudy
Humidity
92%
Feels like
49°F
Dew Point
47°F
7 PM
49°F
10%
4mph
SW
Cloudy
Humidity
90%
Feels like
48°F
Dew Point
46°F
8 PM
49°F
10%
5mph
SW
Cloudy
Humidity
94%
Feels like
47°F
Dew Point
47°F
9 PM
49°F
10%
5mph
SW
Cloudy
Humidity
94%
Feels like
47°F
Dew Point
47°F
10 PM
50°F
10%
6mph
SW
Cloudy
Humidity
91%
Feels like
50°F
Dew Point
48°F
11 PM
50°F
10%
7mph
SW
Cloudy
Humidity
94%
Feels like
47°F
Dew Point
48°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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