S
M
T
W
T
F
S
30
86°
72°
31
N/A
1
95°
72°
2
97°
72°
3
96°
72°
4
93°
72°
5
92°
69°
6
86°
65°
7
88°
64°
8
84°
65°
9
85°
60°
10
78°
58°
11
78°
55°
12
83°
60°
13
83°
61°
14
79°
60°
15
81°
60°
16
81°
59°
17
80°
59°
18
81°
60°
19
81°
60°
20
80°
59°
21
81°
60°
22
81°
59°
23
80°
59°
24
80°
58°
25
79°
58°
26
80°
56°
27
79°
57°
28
79°
56°
29
78°
55°
30
78°
56°
1
77°
55°
2
77°
55°
3
76°
54°
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 76° to 97°, with overnight lows between 54° and 72°. The average high for September is 83° with an average low of 61°. 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.
