S
M
T
W
T
F
S
30
84°
55°
31
85°
54°
1
84°
55°
2
88°
55°
3
89°
53°
4
84°
51°
5
83°
49°
6
84°
48°
7
83°
49°
8
84°
52°
9
83°
49°
10
85°
50°
11
87°
50°
12
84°
51°
13
85°
55°
14
89°
55°
15
Hist. Avg.
85°
51°
16
Hist. Avg.
85°
51°
17
Hist. Avg.
85°
51°
18
Hist. Avg.
85°
51°
19
Hist. Avg.
85°
51°
20
Hist. Avg.
84°
51°
21
Hist. Avg.
84°
51°
22
Hist. Avg.
84°
51°
23
Hist. Avg.
84°
51°
24
Hist. Avg.
84°
51°
25
Hist. Avg.
84°
50°
26
Hist. Avg.
83°
50°
27
Hist. Avg.
83°
50°
28
Hist. Avg.
83°
50°
29
Hist. Avg.
83°
50°
30
Hist. Avg.
82°
50°
1
Hist. Avg.
82°
50°
2
Hist. Avg.
82°
50°
3
Hist. Avg.
82°
50°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Sonoma
Sonoma's September 2026 forecast shows daily high temperatures ranging from 83° to 89°, with overnight lows between 48° and 55°. The average high for September is 85° with an average low of 52°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how September weather will actually feel in Sonoma. See also: October | November | December.
