54°F
Clear Sky
Palo Alto, Napa Valley
Updated 4:20 AM PT
Feels Like
53°F
Humidity
90%
Wind
2 mph SSE
Precipitation
None
Today's High
72°F
Today's Low
52°F
Sunrise
6:38 AM
Sunset
7:39 PM
Hourly Forecast
4 AM
54°
0%
5 AM
53°
0%
6 AM
53°
0%
7 AM
52°
0%
8 AM
56°
0%
9 AM
61°
0%
10 AM
63°
0%
11 AM
66°
0%
12 PM
68°
0%
1 PM
70°
0%
2 PM
71°
0%
3 PM
72°
0%
7-Day Forecast
Today
Overcast
72°
52°
💨 10 mph
Tomorrow
Overcast
71°
53°
💨 12 mph
Wed, Sep 2
Overcast
78°
60°
💨 12 mph
Thu, Sep 3
Foggy
78°
60°
💨 10 mph
Fri, Sep 4
Light Drizzle
76°
59°
💧 0.02"
💨 13 mph
Sat, Sep 5
Clear Sky
79°
56°
💨 10 mph
Sun, Sep 6
Overcast
78°
57°
💨 8 mph
Napa Valley Weather Notes
Palo Alto sits at the heart of the Napa Valley floor, sheltered by the Mayacamas Mountains to the west and the Vaca Range to the east. The valley's fog-channeling geography creates a natural air-conditioning effect — cool Pacific fog rolls in from San Pablo Bay each evening, burning off by mid-morning. Summer afternoons typically reach the 90s°F while winter lows can dip into the low 30s. The peak growing season runs May through October, and frost risk is highest December through February.