S
M
T
W
T
F
S
30
75°
55°
31
76°
54°
1
75°
55°
2
74°
54°
3
74°
53°
4
75°
55°
5
77°
58°
6
74°
57°
7
73°
55°
8
78°
52°
9
73°
56°
10
76°
60°
11
79°
58°
12
80°
58°
13
78°
50°
14
73°
56°
15
71°
50°
16
71°
50°
17
68°
56°
18
75°
52°
19
72°
54°
20
70°
47°
21
75°
46°
22
67°
44°
23
74°
54°
24
75°
55°
25
Hist. Avg.
72°
53°
26
Hist. Avg.
72°
52°
27
Hist. Avg.
71°
52°
28
Hist. Avg.
71°
51°
29
Hist. Avg.
70°
51°
30
Hist. Avg.
70°
50°
1
Hist. Avg.
69°
50°
2
Hist. Avg.
69°
50°
3
Hist. Avg.
68°
49°
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 67° to 80°, with overnight lows between 44° and 60°. The average high for September is 74° with an average low of 54°. 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.
