S
M
T
W
T
F
S
30
93°
63°
31
96°
68°
1
99°
69°
2
100°
72°
3
101°
72°
4
100°
72°
5
102°
72°
6
92°
69°
7
88°
60°
8
95°
59°
9
94°
73°
10
79°
70°
11
83°
68°
12
91°
68°
13
90°
66°
14
87°
61°
15
98°
66°
16
97°
73°
17
97°
71°
18
99°
70°
19
98°
70°
20
94°
68°
21
76°
63°
22
69°
59°
23
67°
60°
24
70°
60°
25
77°
58°
26
73°
58°
27
79°
51°
28
82°
48°
29
84°
49°
30
91°
59°
1
91°
68°
2
73°
56°
3
76°
49°
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 ° to °, with overnight lows between ° and °. The average high for September is ° with an average low of °. 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.
