S
M
T
W
T
F
S
30
86°
69°
31
89°
70°
1
89°
69°
2
88°
68°
3
85°
68°
4
85°
67°
5
82°
67°
6
81°
61°
7
81°
67°
8
86°
61°
9
82°
65°
10
80°
68°
11
86°
65°
12
84°
66°
13
85°
64°
14
84°
65°
15
86°
65°
16
76°
57°
17
77°
61°
18
Hist. Avg.
80°
56°
19
Hist. Avg.
80°
56°
20
Hist. Avg.
79°
56°
21
Hist. Avg.
79°
55°
22
Hist. Avg.
79°
55°
23
Hist. Avg.
78°
54°
24
Hist. Avg.
78°
54°
25
Hist. Avg.
78°
54°
26
Hist. Avg.
77°
53°
27
Hist. Avg.
77°
53°
28
Hist. Avg.
77°
53°
29
Hist. Avg.
76°
52°
30
Hist. Avg.
76°
52°
1
Hist. Avg.
76°
52°
2
Hist. Avg.
75°
51°
3
Hist. Avg.
75°
51°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Affton
Affton's September 2026 forecast shows daily high temperatures ranging from 76° to 89°, with overnight lows between 57° and 70°. The average high for September is 84° 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 Affton. See also: October | November | December.
