S
M
T
W
T
F
S
30
86°
57°
31
86°
61°
1
89°
62°
2
92°
62°
3
92°
59°
4
85°
60°
5
86°
58°
6
88°
54°
7
85°
55°
8
86°
57°
9
88°
58°
10
91°
59°
11
91°
60°
12
92°
60°
13
92°
59°
14
91°
56°
15
86°
56°
16
87°
59°
17
90°
60°
18
90°
60°
19
91°
58°
20
91°
59°
21
90°
60°
22
87°
55°
23
83°
53°
24
82°
52°
25
81°
51°
26
80°
53°
27
81°
56°
28
83°
54°
29
87°
51°
30
81°
52°
1
Hist. Avg.
84°
55°
2
Hist. Avg.
83°
55°
3
Hist. Avg.
83°
55°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Fairfield
Fairfield's September 2026 forecast shows daily high temperatures ranging from 80° to 92°, with overnight lows between 51° 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 Fairfield. See also: October | November | December.
