S
M
T
W
T
F
S
30
73°
50°
31
85°
44°
1
84°
56°
2
75°
55°
3
78°
53°
4
75°
46°
5
82°
45°
6
80°
51°
7
67°
42°
8
74°
45°
9
77°
50°
10
84°
55°
11
82°
51°
12
76°
49°
13
72°
46°
14
79°
48°
15
80°
50°
16
78°
49°
17
80°
48°
18
79°
49°
19
84°
48°
20
68°
43°
21
78°
50°
22
67°
48°
23
67°
45°
24
71°
49°
25
74°
49°
26
75°
48°
27
71°
47°
28
66°
40°
29
62°
35°
30
61°
35°
1
63°
41°
2
65°
40°
3
71°
43°
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 61° to 84°, with overnight lows between 35° and 55°. The average high for September is 73° with an average low of 46°. 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.
