S
M
T
W
T
F
S
30
80°
62°
31
81°
64°
1
85°
64°
2
86°
67°
3
86°
67°
4
85°
62°
5
82°
60°
6
80°
61°
7
80°
61°
8
81°
65°
9
79°
66°
10
80°
65°
11
84°
64°
12
85°
65°
13
85°
65°
14
84°
66°
15
85°
65°
16
84°
65°
17
83°
64°
18
83°
61°
19
82°
62°
20
81°
56°
21
77°
60°
22
77°
62°
23
79°
60°
24
82°
56°
25
81°
55°
26
79°
61°
27
80°
60°
28
75°
57°
29
79°
58°
30
79°
58°
1
80°
57°
2
79°
58°
3
73°
58°
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 73° to 86°, with overnight lows between 55° and 67°. The average high for September is 81° with an average low of 62°. 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.
