S
M
T
W
T
F
S
30
92°
66°
31
98°
68°
1
100°
72°
2
100°
74°
3
100°
73°
4
101°
74°
5
100°
73°
6
89°
64°
7
87°
60°
8
95°
59°
9
93°
70°
10
79°
67°
11
84°
65°
12
92°
66°
13
85°
57°
14
87°
56°
15
100°
68°
16
92°
71°
17
100°
70°
18
95°
71°
19
92°
70°
20
90°
70°
21
71°
62°
22
73°
59°
23
N/A
24
N/A
25
75°
57°
26
76°
55°
27
N/A
28
82°
46°
29
85°
49°
30
90°
63°
1
90°
66°
2
74°
53°
3
75°
45°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Assumption
Assumption'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 Assumption. See also: October | November | December.
