S
M
T
W
T
F
S
30
92°
60°
31
90°
57°
1
86°
52°
2
87°
53°
3
89°
55°
4
88°
57°
5
86°
60°
6
87°
57°
7
86°
55°
8
85°
58°
9
85°
56°
10
87°
56°
11
85°
55°
12
90°
54°
13
89°
56°
14
90°
55°
15
85°
51°
16
82°
54°
17
82°
56°
18
83°
56°
19
84°
57°
20
86°
56°
21
85°
56°
22
86°
57°
23
83°
56°
24
86°
57°
25
87°
57°
26
81°
58°
27
86°
59°
28
87°
57°
29
87°
57°
30
86°
58°
1
87°
57°
2
86°
57°
3
85°
56°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Suisun City
Suisun City's September 2026 forecast shows daily high temperatures ranging from 81° to 92°, with overnight lows between 51° and 60°. The average high for September is 86° with an average low of 56°. 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 Suisun City. See also: October | November | December.
