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
N/A
6
81°
51°
7
66°
44°
8
74°
45°
9
79°
53°
10
81°
55°
11
85°
53°
12
72°
49°
13
76°
48°
14
79°
51°
15
76°
48°
16
78°
49°
17
78°
50°
18
82°
49°
19
67°
40°
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
*Temporarily Unavailable
September Weather in Rupert
Rupert's September 2026 forecast shows daily high temperatures ranging from 61° to 85°, 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.
