S
M
T
W
T
F
S
30
88°
63°
31
89°
54°
1
88°
54°
2
77°
60°
3
84°
61°
4
87°
59°
5
87°
51°
6
78°
54°
7
79°
60°
8
85°
58°
9
85°
52°
10
76°
55°
11
74°
52°
12
75°
48°
13
74°
48°
14
74°
49°
15
75°
55°
16
76°
57°
17
82°
58°
18
82°
56°
19
81°
51°
20
75°
53°
21
80°
55°
22
78°
46°
23
82°
46°
24
71°
45°
25
71°
45°
26
69°
43°
27
81°
53°
28
80°
53°
29
Hist. Avg.
73°
48°
30
Hist. Avg.
73°
47°
1
Hist. Avg.
72°
47°
2
Hist. Avg.
72°
46°
3
Hist. Avg.
71°
46°
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 69° to 89°, with overnight lows between 43° and 63°. The average high for September is 79° with an average low of 53°. 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.
