S
M
T
W
T
F
S
30
82°
50°
31
72°
50°
1
73°
59°
2
77°
57°
3
68°
59°
4
77°
52°
5
81°
52°
6
79°
48°
7
91°
52°
8
97°
54°
9
100°
61°
10
102°
59°
11
86°
55°
12
81°
54°
13
79°
54°
14
88°
52°
15
82°
52°
16
70°
54°
17
77°
55°
18
82°
54°
19
87°
54°
20
78°
54°
21
79°
53°
22
81°
51°
23
93°
49°
24
93°
52°
25
89°
53°
26
86°
52°
27
86°
51°
28
85°
53°
29
87°
51°
30
87°
53°
1
89°
52°
2
77°
46°
3
81°
51°
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 93°, with overnight lows between 46° and 54°. 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 Raceway. See also: October | November | December.
