S
M
T
W
T
F
S
26
68°
66°
27
68°
67°
28
68°
67°
29
68°
66°
30
68°
67°
31
68°
66°
1
68°
66°
2
68°
66°
3
67°
65°
4
68°
66°
5
67°
65°
6
67°
65°
7
67°
64°
8
67°
64°
9
66°
65°
10
66°
64°
11
66°
65°
12
66°
65°
13
66°
65°
14
67°
66°
15
67°
65°
16
67°
66°
17
68°
66°
18
67°
65°
19
68°
65°
20
66°
64°
21
67°
65°
22
66°
65°
23
66°
65°
24
Hist. Avg.
80°
66°
25
Hist. Avg.
80°
66°
26
Hist. Avg.
80°
66°
27
Hist. Avg.
80°
66°
28
Hist. Avg.
80°
66°
29
Hist. Avg.
80°
66°
30
Hist. Avg.
80°
66°
31
Hist. Avg.
80°
66°
1
Hist. Avg.
80°
66°
2
Hist. Avg.
80°
66°
3
Hist. Avg.
80°
66°
4
Hist. Avg.
81°
66°
5
Hist. Avg.
81°
66°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
August Weather in Santa Rosa
Santa Rosa's August 2026 forecast shows daily high temperatures ranging from 66° to 68°, with overnight lows between 64° and 67°. The average high for August is 67° with an average low of 65°. 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 Santa Rosa. See also: September | October | November.
