S
M
T
W
T
F
S
30
79°
57°
31
77°
57°
1
77°
61°
2
78°
64°
3
80°
64°
4
85°
65°
5
85°
63°
6
83°
57°
7
80°
56°
8
78°
56°
9
77°
55°
10
75°
54°
11
76°
55°
12
75°
55°
13
79°
60°
14
80°
60°
15
78°
58°
16
76°
57°
17
75°
56°
18
76°
59°
19
77°
51°
20
76°
55°
21
75°
52°
22
79°
50°
23
72°
49°
24
72°
50°
25
73°
55°
26
72°
50°
27
74°
55°
28
72°
54°
29
73°
47°
30
70°
50°
1
69°
54°
2
76°
52°
3
74°
47°
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 69° to 85°, with overnight lows between 47° and 65°. The average high for September is 76° with an average low of 55°. 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.
