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
N/A
21
70°
59°
22
66°
54°
23
70°
54°
24
72°
55°
25
72°
51°
26
71°
52°
27
75°
52°
28
76°
53°
29
78°
54°
30
76°
52°
1
74°
54°
2
76°
48°
3
68°
53°
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 66° to 78°, with overnight lows between 48° and 59°. The average high for September is 73° 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 Assumption. See also: October | November | December.
