S
M
T
W
T
F
S
30
80°
55°
31
76°
60°
1
74°
61°
2
74°
59°
3
81°
64°
4
83°
60°
5
81°
54°
6
74°
53°
7
74°
53°
8
73°
57°
9
78°
58°
10
73°
53°
11
71°
49°
12
71°
49°
13
70°
52°
14
71°
49°
15
69°
48°
16
68°
47°
17
67°
46°
18
67°
47°
19
68°
46°
20
67°
47°
21
67°
47°
22
68°
50°
23
70°
54°
24
72°
54°
25
73°
53°
26
73°
46°
27
72°
45°
28
65°
53°
29
64°
50°
30
72°
50°
1
69°
51°
2
66°
45°
3
62°
48°
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 62° to 83°, with overnight lows between 45° and 64°. The average high for September is 72° with an average low of 52°. 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.
