S
M
T
W
T
F
S
30
87°
50°
31
88°
46°
1
85°
39°
2
74°
39°
3
76°
44°
4
83°
48°
5
84°
44°
6
79°
37°
7
73°
34°
8
68°
39°
9
69°
36°
10
71°
43°
11
75°
34°
12
71°
36°
13
70°
44°
14
80°
46°
15
82°
34°
16
69°
33°
17
67°
34°
18
71°
35°
19
78°
35°
20
79°
42°
21
78°
44°
22
78°
40°
23
69°
37°
24
68°
41°
25
73°
42°
26
73°
40°
27
69°
42°
28
71°
41°
29
66°
40°
30
64°
33°
1
60°
30°
2
60°
30°
3
62°
34°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Fairfield
Fairfield's September 2026 forecast shows daily high temperatures ranging from 60° to 88°, with overnight lows between 30° and 50°. The average high for September is 73° with an average low of 39°. 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.
