S
M
T
W
T
F
S
26
81°
58°
27
81°
56°
28
87°
57°
29
86°
58°
30
88°
58°
31
87°
55°
1
94°
57°
2
96°
57°
3
95°
57°
4
90°
57°
5
83°
58°
6
82°
57°
7
76°
53°
8
81°
56°
9
87°
57°
10
87°
57°
11
87°
57°
12
75°
55°
13
73°
57°
14
70°
60°
15
73°
56°
16
78°
57°
17
73°
58°
18
77°
57°
19
87°
56°
20
85°
58°
21
84°
57°
22
88°
58°
23
89°
58°
24
90°
57°
25
86°
56°
26
85°
57°
27
86°
56°
28
83°
55°
29
85°
58°
30
81°
54°
31
83°
57°
1
81°
55°
2
81°
56°
3
82°
55°
4
80°
55°
5
81°
56°
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 70° to 90°, with overnight lows between 54° and 60°. The average high for August is 82° with an average low of 57°. 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.
