S
M
T
W
T
F
S
30
80°
48°
31
71°
50°
1
74°
56°
2
71°
58°
3
70°
60°
4
73°
51°
5
77°
48°
6
79°
49°
7
87°
50°
8
95°
56°
9
98°
62°
10
92°
65°
11
75°
54°
12
81°
50°
13
77°
52°
14
83°
52°
15
81°
50°
16
72°
56°
17
74°
52°
18
80°
50°
19
78°
51°
20
72°
53°
21
69°
54°
22
74°
51°
23
87°
50°
24
89°
54°
25
81°
53°
26
74°
46°
27
73°
54°
28
76°
47°
29
94°
49°
30
89°
52°
1
87°
45°
2
93°
48°
3
102°
57°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Sebastopol
Sebastopol's September 2026 forecast shows daily high temperatures ranging from ° to °, with overnight lows between ° and °. The average high for September is ° with an average low of °. 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 Sebastopol. See also: October | November | December.
