S
M
T
W
T
F
S
30
73°
52°
31
73°
52°
1
74°
50°
2
74°
51°
3
75°
57°
4
74°
54°
5
75°
50°
6
72°
49°
7
72°
54°
8
73°
56°
9
71°
56°
10
74°
52°
11
74°
50°
12
69°
49°
13
73°
56°
14
69°
49°
15
69°
49°
16
Hist. Avg.
72°
50°
17
Hist. Avg.
71°
49°
18
Hist. Avg.
71°
49°
19
Hist. Avg.
70°
48°
20
Hist. Avg.
70°
48°
21
Hist. Avg.
70°
48°
22
Hist. Avg.
69°
47°
23
Hist. Avg.
69°
47°
24
Hist. Avg.
68°
46°
25
Hist. Avg.
68°
46°
26
Hist. Avg.
67°
46°
27
Hist. Avg.
67°
45°
28
Hist. Avg.
66°
45°
29
Hist. Avg.
66°
44°
30
Hist. Avg.
66°
44°
1
Hist. Avg.
65°
44°
2
Hist. Avg.
65°
43°
3
Hist. Avg.
64°
43°
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 69° to 75°, with overnight lows between 49° and 57°. The average high for September is 73° with an average low of 52°. 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.
