S
M
T
W
T
F
S
30
79°
61°
31
79°
65°
1
78°
65°
2
79°
63°
3
78°
55°
4
71°
54°
5
70°
59°
6
73°
64°
7
77°
64°
8
78°
62°
9
74°
56°
10
73°
62°
11
76°
61°
12
76°
63°
13
77°
63°
14
76°
62°
15
76°
60°
16
75°
60°
17
71°
57°
18
75°
53°
19
67°
51°
20
66°
50°
21
64°
49°
22
65°
58°
23
67°
54°
24
66°
49°
25
64°
50°
26
65°
56°
27
70°
57°
28
71°
56°
29
70°
54°
30
70°
54°
1
63°
55°
2
69°
48°
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 79°, with overnight lows between 48° and 65°. The average high for September is 72° 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.
