Hourly Weather Forecast - Portola Valley, CA

9 PM
42°F
0%
1mph
SE
Partly Cloudy
Humidity
96%
Feels like
42°F
Dew Point
41°F
10 PM
41°F
0%
1mph
SSE
Partly Cloudy
Humidity
98%
Feels like
41°F
Dew Point
40°F
11 PM
40°F
0%
0mph
SSE
Foggy
Humidity
99%
Feels like
40°F
Dew Point
40°F

Wind chill temperatures Monday A.M.

Cold Weather Chills the Nation Down to the Gulf

Extreme cold paired with their wind chill values will shiver much of the nation.

Snowfall forecast through Monday evening.

Mid-Atlantic, Great Lakes Snow Piles Up

Monday's Weather Outlook

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

Cold Air Damming - Cause And Effects

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