S
M
T
W
T
F
S
30
83°
48°
31
78°
47°
1
75°
45°
2
76°
49°
3
78°
48°
4
84°
46°
5
81°
54°
6
79°
50°
7
74°
44°
8
73°
43°
9
74°
44°
10
73°
45°
11
74°
49°
12
78°
49°
13
82°
46°
14
82°
48°
15
81°
52°
16
76°
52°
17
73°
47°
18
71°
51°
19
74°
52°
20
79°
53°
21
80°
52°
22
79°
50°
23
71°
52°
24
73°
42°
25
69°
43°
26
69°
50°
27
70°
43°
28
68°
42°
29
67°
46°
30
69°
49°
1
74°
50°
2
76°
48°
3
75°
48°
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 67° to 84°, with overnight lows between 42° and 54°. The average high for September is 75° with an average low of 48°. 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.
