S
M
T
W
T
F
S
30
83°
65°
31
82°
59°
1
79°
58°
2
75°
59°
3
75°
59°
4
76°
60°
5
75°
58°
6
74°
58°
7
74°
59°
8
75°
58°
9
74°
60°
10
72°
57°
11
74°
57°
12
75°
59°
13
74°
58°
14
75°
57°
15
72°
56°
16
72°
55°
17
70°
56°
18
72°
56°
19
70°
60°
20
73°
59°
21
75°
52°
22
Hist. Avg.
73°
58°
23
Hist. Avg.
73°
57°
24
Hist. Avg.
73°
57°
25
Hist. Avg.
72°
56°
26
Hist. Avg.
72°
56°
27
Hist. Avg.
72°
56°
28
Hist. Avg.
71°
55°
29
Hist. Avg.
71°
55°
30
Hist. Avg.
70°
54°
1
Hist. Avg.
70°
54°
2
Hist. Avg.
70°
54°
3
Hist. Avg.
69°
53°
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 70° to 83°, with overnight lows between 52° and 65°. The average high for September is 75° with an average low of 58°. 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.
