S
M
T
W
T
F
S
30
85°
55°
31
83°
52°
1
80°
49°
2
81°
47°
3
83°
50°
4
81°
52°
5
80°
55°
6
80°
53°
7
81°
52°
8
79°
54°
9
79°
52°
10
82°
51°
11
79°
50°
12
85°
48°
13
84°
50°
14
84°
49°
15
80°
47°
16
77°
49°
17
77°
51°
18
78°
51°
19
79°
52°
20
80°
51°
21
80°
52°
22
81°
53°
23
79°
52°
24
81°
52°
25
82°
51°
26
77°
53°
27
82°
54°
28
83°
52°
29
83°
52°
30
82°
53°
1
83°
53°
2
82°
52°
3
82°
52°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Sonoma Raceway
Sonoma Raceway's September 2026 forecast shows daily high temperatures ranging from 77° to 85°, with overnight lows between 47° and 55°. The average high for September is 81° with an average low of 51°. 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 Raceway. See also: October | November | December.
