S
M
T
W
T
F
S
31
100°
62°
1
102°
65°
2
96°
65°
3
95°
59°
4
83°
57°
5
85°
58°
6
83°
60°
7
88°
59°
8
83°
60°
9
80°
61°
10
80°
60°
11
82°
61°
12
87°
61°
13
83°
60°
14
88°
58°
15
95°
55°
16
98°
54°
17
100°
59°
18
86°
66°
19
86°
61°
20
89°
61°
21
91°
62°
22
96°
58°
23
101°
58°
24
87°
65°
25
86°
60°
26
90°
58°
27
79°
62°
28
73°
63°
29
76°
63°
30
80°
60°
1
78°
61°
2
74°
62°
3
75°
55°
4
82°
47°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Fairfield
Fairfield's September 2025 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 Fairfield. See also: October | November | December.
