Hourly Weather Forecast - Portola Valley, CA

9 PM
46°F
0%
1mph
NNW
Mostly Clear
Humidity
86%
Feels like
46°F
Dew Point
42°F
10 PM
46°F
0%
1mph
NNW
Mostly Clear
Humidity
85%
Feels like
46°F
Dew Point
42°F
11 PM
45°F
0%
1mph
NW
Mostly Clear
Humidity
85%
Feels like
45°F
Dew Point
41°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.

Tuesday's Weather Outlook

Tuesday'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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