S
M
T
W
T
F
S
30
72°
54°
31
72°
59°
1
77°
55°
2
76°
58°
3
77°
55°
4
72°
51°
5
70°
56°
6
72°
57°
7
72°
57°
8
75°
56°
9
74°
55°
10
69°
56°
11
74°
55°
12
75°
56°
13
74°
55°
14
74°
56°
15
73°
55°
16
74°
55°
17
73°
54°
18
73°
47°
19
66°
47°
20
66°
45°
21
65°
45°
22
65°
46°
23
68°
49°
24
69°
45°
25
65°
45°
26
67°
51°
27
64°
50°
28
67°
50°
29
69°
51°
30
69°
49°
1
67°
48°
2
68°
48°
3
64°
48°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Rupert
Rupert's September 2026 forecast shows daily high temperatures ranging from 64° to 77°, with overnight lows between 45° and 59°. The average high for September is 70° with an average low of 52°. 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 Rupert. See also: October | November | December.
