Hourly Weather Forecast - Port Costa, CA

12 AM
45°F
0%
5mph
WSW
Partly Cloudy
Humidity
91%
Feels like
42°F
Dew Point
43°F
1 AM
45°F
0%
5mph
WSW
Partly Cloudy
Humidity
92%
Feels like
42°F
Dew Point
43°F
2 AM
46°F
0%
5mph
WSW
Partly Cloudy
Humidity
89%
Feels like
43°F
Dew Point
43°F
3 AM
46°F
0%
5mph
WSW
Cloudy
Humidity
88%
Feels like
43°F
Dew Point
42°F
4 AM
44°F
0%
4mph
WSW
Cloudy
Humidity
92%
Feels like
42°F
Dew Point
42°F
5 AM
44°F
0%
4mph
SW
Cloudy
Humidity
91%
Feels like
42°F
Dew Point
42°F
6 AM
45°F
0%
4mph
SW
Mostly Cloudy
Humidity
87%
Feels like
43°F
Dew Point
42°F
7 AM
45°F
0%
5mph
SSW
Cloudy
Humidity
90%
Feels like
43°F
Dew Point
42°F
7:19 AM
8 AM
49°F
0%
5mph
SSW
Cloudy
Humidity
84%
Feels like
47°F
Dew Point
44°F
9 AM
52°F
0%
5mph
SSW
Cloudy
Humidity
76%
Feels like
52°F
Dew Point
45°F
10 AM
54°F
0%
5mph
SW
Mostly Cloudy
Humidity
74%
Feels like
54°F
Dew Point
46°F
11 AM
55°F
0%
5mph
SW
Cloudy
Humidity
70%
Feels like
55°F
Dew Point
46°F
12 PM
58°F
0%
5mph
WSW
Cloudy
Humidity
65%
Feels like
58°F
Dew Point
46°F
1 PM
59°F
0%
5mph
WSW
Cloudy
Humidity
62%
Feels like
59°F
Dew Point
46°F
2 PM
58°F
0%
5mph
WSW
Mostly Cloudy
Humidity
65%
Feels like
58°F
Dew Point
47°F
3 PM
58°F
0%
5mph
WSW
Mostly Cloudy
Humidity
67%
Feels like
58°F
Dew Point
47°F
4 PM
54°F
0%
5mph
WSW
Mostly Cloudy
Humidity
80%
Feels like
54°F
Dew Point
48°F
4:51 PM
5 PM
50°F
0%
5mph
WSW
Mostly Cloudy
Humidity
82%
Feels like
48°F
Dew Point
45°F
6 PM
48°F
0%
5mph
WSW
Cloudy
Humidity
86%
Feels like
46°F
Dew Point
44°F
7 PM
47°F
0%
5mph
SW
Cloudy
Humidity
87%
Feels like
45°F
Dew Point
44°F
8 PM
47°F
0%
5mph
SW
Cloudy
Humidity
91%
Feels like
45°F
Dew Point
44°F
9 PM
47°F
0%
5mph
WSW
Cloudy
Humidity
91%
Feels like
44°F
Dew Point
44°F
10 PM
47°F
0%
5mph
WSW
Cloudy
Humidity
88%
Feels like
45°F
Dew Point
44°F
11 PM
47°F
0%
5mph
SW
Cloudy
Humidity
90%
Feels like
44°F
Dew Point
44°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

loading ad...

Today's National Outlook

Hurricane Tracker

Allergy Forecast

Snow & Ski Forecast

Traffic Cameras

Weather Cameras

Traffic Cameras

Weather Cameras

Outdoor Sports Guide