S
M
T
W
T
F
S
30
80°
54°
31
81°
56°
1
80°
56°
2
78°
54°
3
73°
49°
4
72°
48°
5
72°
47°
6
73°
46°
7
76°
51°
8
79°
52°
9
78°
47°
10
77°
53°
11
72°
41°
12
70°
45°
13
71°
43°
14
70°
42°
15
69°
44°
16
70°
43°
17
69°
49°
18
73°
43°
19
71°
40°
20
68°
39°
21
67°
39°
22
68°
40°
23
69°
41°
24
73°
43°
25
75°
47°
26
73°
48°
27
70°
47°
28
67°
46°
29
68°
38°
30
69°
38°
1
67°
42°
2
73°
41°
3
70°
36°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Riverton
Riverton's September 2026 forecast shows daily high temperatures ranging from 67° to 81°, with overnight lows between 36° and 56°. The average high for September is 72° with an average low of 45°. 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 Riverton. See also: October | November | December.
