S
M
T
W
T
F
S
30
93°
60°
31
93°
59°
1
92°
60°
2
92°
62°
3
93°
61°
4
92°
59°
5
91°
56°
6
88°
54°
7
84°
57°
8
86°
58°
9
90°
59°
10
90°
61°
11
91°
59°
12
89°
57°
13
89°
57°
14
90°
56°
15
86°
55°
16
83°
53°
17
86°
55°
18
89°
58°
19
90°
59°
20
89°
57°
21
87°
58°
22
83°
57°
23
81°
53°
24
83°
56°
25
82°
53°
26
82°
52°
27
81°
52°
28
79°
50°
29
80°
51°
30
79°
53°
1
79°
59°
2
84°
58°
3
86°
57°
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 79° to 93°, with overnight lows between 50° and 62°. The average high for September is 87° with an average low of 57°. 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.
