S
M
T
W
T
F
S
30
84°
74°
31
84°
74°
1
89°
74°
2
88°
78°
3
90°
77°
4
91°
77°
5
85°
75°
6
81°
77°
7
81°
76°
8
81°
73°
9
83°
69°
10
85°
74°
11
86°
76°
12
83°
78°
13
83°
79°
14
84°
75°
15
78°
72°
16
78°
71°
17
80°
68°
18
85°
72°
19
80°
76°
20
82°
76°
21
84°
73°
22
N/A
23
N/A
24
72°
68°
25
N/A
26
N/A
27
76°
60°
28
N/A
29
75°
67°
30
N/A
1
89°
68°
2
91°
70°
3
82°
68°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Fairfield
Fairfield's September 2026 forecast shows daily high temperatures ranging from 82° to 91°, with overnight lows between 68° and 70°. The average high for September is 87° with an average low of 69°. 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.
