S
M
T
W
T
F
S
30
78°
56°
31
80°
59°
1
84°
54°
2
79°
53°
3
77°
54°
4
78°
55°
5
79°
61°
6
83°
61°
7
84°
60°
8
77°
59°
9
76°
60°
10
81°
59°
11
81°
57°
12
79°
60°
13
76°
57°
14
75°
52°
15
74°
52°
16
73°
51°
17
73°
51°
18
74°
53°
19
79°
56°
20
78°
57°
21
79°
53°
22
75°
50°
23
73°
54°
24
72°
55°
25
77°
48°
26
71°
53°
27
75°
54°
28
77°
53°
29
Hist. Avg.
74°
50°
30
Hist. Avg.
73°
50°
1
Hist. Avg.
73°
49°
2
Hist. Avg.
72°
49°
3
Hist. Avg.
72°
48°
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 71° to 84°, with overnight lows between 48° and 61°. The average high for September is 77° 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.
