S
M
T
W
T
F
S
26
82°
51°
27
86°
53°
28
84°
54°
29
84°
59°
30
83°
56°
31
87°
55°
1
N/A
2
96°
53°
3
95°
52°
4
87°
53°
5
86°
53°
6
86°
57°
7
89°
56°
8
90°
57°
9
85°
56°
10
83°
56°
11
82°
55°
12
83°
56°
13
84°
56°
14
81°
55°
15
84°
56°
16
79°
57°
17
80°
56°
18
81°
55°
19
80°
54°
20
80°
54°
21
84°
56°
22
84°
55°
23
82°
57°
24
85°
57°
25
86°
56°
26
86°
59°
27
85°
58°
28
86°
58°
29
84°
57°
30
83°
58°
31
85°
58°
1
84°
55°
2
84°
56°
3
87°
56°
4
82°
55°
5
82°
56°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
August Weather in Napa
Napa's August 2026 forecast shows daily high temperatures ranging from 79° to 96°, with overnight lows between 52° and 59°. The average high for August is 85° with an average low of 56°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how August weather will actually feel in Napa. See also: September | October | November.
