Hourly Weather Forecast - Portola Valley, CA

9 AM
60°F
70%
3mph
SW
70% Chance of Light Rain
Humidity
92%
Feels like
60°F
Dew Point
58°F
10 AM
61°F
20%
3mph
SW
Cloudy
Humidity
91%
Feels like
61°F
Dew Point
58°F
11 AM
61°F
10%
2mph
SW
Mostly Cloudy
Humidity
93%
Feels like
61°F
Dew Point
59°F
12 PM
61°F
10%
2mph
W
Partly Cloudy
Humidity
92%
Feels like
61°F
Dew Point
59°F
1 PM
61°F
10%
2mph
WNW
Partly Cloudy
Humidity
91%
Feels like
61°F
Dew Point
59°F
2 PM
61°F
0%
3mph
WNW
Partly Cloudy
Humidity
92%
Feels like
61°F
Dew Point
58°F
3 PM
59°F
0%
3mph
WNW
Partly Cloudy
Humidity
96%
Feels like
59°F
Dew Point
58°F
4 PM
55°F
0%
3mph
WNW
Foggy
Humidity
100%
Feels like
55°F
Dew Point
55°F
4:52 PM
5 PM
51°F
0%
2mph
WNW
Foggy
Humidity
100%
Feels like
51°F
Dew Point
51°F
6 PM
49°F
0%
2mph
NW
Foggy
Humidity
100%
Feels like
49°F
Dew Point
49°F
7 PM
46°F
0%
2mph
NW
Foggy
Humidity
100%
Feels like
46°F
Dew Point
46°F
8 PM
44°F
0%
2mph
WNW
Foggy
Humidity
100%
Feels like
44°F
Dew Point
44°F
9 PM
42°F
0%
2mph
WNW
Foggy
Humidity
100%
Feels like
42°F
Dew Point
42°F
10 PM
42°F
0%
1mph
W
Foggy
Humidity
100%
Feels like
42°F
Dew Point
42°F
11 PM
41°F
10%
2mph
W
Foggy
Humidity
100%
Feels like
41°F
Dew Point
41°F

Rainfall and Snowfall Totals Through Thursday

Pineapple Express Slams Northwestern U.S.

The atmospheric river this week will keep buffeting the Pacific Northwest with heavy rain, snow, and high winds.

Wednesday's Weather Outlook

Today's Weather Outlook

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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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