S
M
T
W
T
F
S
30
93°
71°
31
92°
66°
1
87°
65°
2
86°
65°
3
87°
69°
4
91°
68°
5
91°
69°
6
90°
69°
7
90°
68°
8
86°
69°
9
87°
63°
10
85°
66°
11
87°
63°
12
84°
61°
13
83°
62°
14
82°
61°
15
83°
62°
16
83°
61°
17
86°
64°
18
87°
65°
19
87°
65°
20
Hist. Avg.
85°
64°
21
Hist. Avg.
85°
63°
22
Hist. Avg.
84°
63°
23
Hist. Avg.
84°
62°
24
Hist. Avg.
84°
62°
25
Hist. Avg.
83°
62°
26
Hist. Avg.
83°
61°
27
Hist. Avg.
83°
61°
28
Hist. Avg.
82°
60°
29
Hist. Avg.
82°
60°
30
Hist. Avg.
82°
60°
1
Hist. Avg.
81°
59°
2
Hist. Avg.
81°
59°
3
Hist. Avg.
81°
58°
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 82° to 93°, with overnight lows between 61° and 71°. The average high for September is 87° with an average low of 65°. 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.
