S
M
T
W
T
F
S
30
80°
60°
31
79°
54°
1
79°
49°
2
71°
50°
3
70°
54°
4
75°
59°
5
77°
59°
6
78°
50°
7
71°
50°
8
72°
53°
9
75°
56°
10
68°
57°
11
75°
56°
12
75°
56°
13
73°
54°
14
66°
49°
15
66°
47°
16
67°
45°
17
66°
54°
18
67°
46°
19
65°
54°
20
70°
55°
21
71°
48°
22
67°
44°
23
63°
47°
24
62°
46°
25
61°
44°
26
60°
43°
27
Hist. Avg.
64°
45°
28
Hist. Avg.
63°
44°
29
Hist. Avg.
63°
44°
30
Hist. Avg.
62°
44°
1
Hist. Avg.
62°
43°
2
Hist. Avg.
61°
43°
3
Hist. Avg.
61°
42°
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 60° to 80°, with overnight lows between 43° and 60°. The average high for September is 70° with an average low of 51°. 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.
