57°F
Partly Cloudy
Yountville, Napa Valley
Updated 1:21 AM PT
Feels Like
55°F
Humidity
93%
Wind
9 mph SE
Precipitation
None
Today's High
78°F
Today's Low
54°F
Sunrise
6:38 AM
Sunset
7:40 PM
Hourly Forecast
1 AM
57°
0%
2 AM
56°
0%
3 AM
55°
0%
4 AM
55°
0%
5 AM
55°
0%
6 AM
55°
0%
7 AM
54°
0%
8 AM
55°
0%
9 AM
57°
0%
10 AM
61°
0%
11 AM
67°
0%
12 PM
72°
0%
7-Day Forecast
Today
Foggy
78°
54°
💨 11 mph
Tomorrow
Overcast
68°
51°
💨 10 mph
Wed, Sep 2
Overcast
79°
53°
💨 13 mph
Thu, Sep 3
Overcast
68°
54°
💨 4 mph
Fri, Sep 4
Light Drizzle
80°
54°
💧 0.01"
💨 13 mph
Sat, Sep 5
Clear Sky
82°
50°
💨 11 mph
Sun, Sep 6
Overcast
86°
50°
💨 8 mph
Napa Valley Weather Notes
Yountville 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.