S
M
T
W
T
F
S
26
80°
54°
27
80°
54°
28
81°
55°
29
81°
55°
30
80°
54°
31
80°
54°
1
85°
55°
2
86°
56°
3
82°
55°
4
80°
54°
5
80°
54°
6
81°
55°
7
80°
55°
8
80°
56°
9
81°
55°
10
86°
54°
11
82°
54°
12
86°
53°
13
85°
55°
14
88°
57°
15
87°
58°
16
87°
59°
17
88°
59°
18
88°
58°
19
89°
59°
20
89°
59°
21
88°
58°
22
88°
59°
23
87°
58°
24
88°
58°
25
88°
57°
26
87°
60°
27
88°
58°
28
88°
58°
29
87°
56°
30
86°
55°
31
85°
53°
1
84°
54°
2
83°
53°
3
83°
52°
4
82°
51°
5
82°
52°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Vallejo
Vallejo's August 2026 forecast shows daily high temperatures ranging from 80° to 89°, with overnight lows between 51° and 60°. The average high for August is 84° 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 Vallejo. See also: September | October | November.
