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
87°
55°
2
91°
55°
3
91°
57°
4
86°
59°
5
82°
57°
6
82°
52°
7
82°
55°
8
82°
55°
9
84°
56°
10
80°
57°
11
80°
54°
12
78°
54°
13
78°
54°
14
78°
54°
15
77°
58°
16
78°
56°
17
79°
57°
18
81°
55°
19
81°
56°
20
80°
55°
21
84°
56°
22
83°
54°
23
88°
54°
24
88°
56°
25
84°
58°
26
87°
52°
27
88°
58°
28
81°
62°
29
77°
52°
30
76°
51°
31
72°
55°
1
73°
59°
2
76°
56°
3
75°
59°
4
76°
55°
5
80°
49°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Napa
Napa's August 2026 forecast shows daily high temperatures ranging from ° to °, with overnight lows between ° and °. The average high for August is ° with an average low of °. 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.
