Hourly Weather Forecast - Portola Valley, CA

6 PM
46°F
0%
3mph
N
Clear
Humidity
88%
Feels like
45°F
Dew Point
43°F
7 PM
45°F
0%
3mph
N
Clear
Humidity
88%
Feels like
45°F
Dew Point
42°F
8 PM
44°F
0%
2mph
N
Clear
Humidity
87%
Feels like
44°F
Dew Point
40°F
9 PM
43°F
0%
2mph
NE
Clear
Humidity
87%
Feels like
43°F
Dew Point
40°F
10 PM
43°F
0%
3mph
ENE
Clear
Humidity
87%
Feels like
43°F
Dew Point
40°F
11 PM
43°F
0%
3mph
ENE
Clear
Humidity
87%
Feels like
43°F
Dew Point
39°F

Snow and ice forecast through Thursday A.M.

Snow Barrels Across the Northern U.S.

Low pressure will produce a swath of snow from Minnesota to Maine into Thursday.

Rainfall Forecast for Northwest through Thursday

Heavy Rain, Flooding Soaks The Northwest

Wednesday's Weather Outlook

Wednesday's Weather Outlook

Weekly Drought Map for December 4, 2025

Active Week of Weather Leads to Mixed Drought Results

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

Cold Air Damming - Cause And Effects

People skating on a frozen pond on a clear day. (Image by Q K from Pixabay)

Safety Tips For Icy Surfaces

Today's National Outlook

Hurricane Tracker

Allergy Forecast

Snow & Ski Forecast

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Weather Cameras

Traffic Cameras

Weather Cameras

Outdoor Sports Guide