S
M
T
W
T
F
S
30
84°
51°
31
84°
46°
1
75°
48°
2
77°
50°
3
79°
48°
4
76°
45°
5
74°
46°
6
75°
49°
7
78°
41°
8
75°
43°
9
74°
47°
10
76°
43°
11
73°
42°
12
72°
44°
13
72°
46°
14
77°
47°
15
78°
48°
16
80°
49°
17
80°
41°
18
78°
39°
19
69°
45°
20
76°
46°
21
77°
45°
22
76°
34°
23
68°
35°
24
65°
37°
25
73°
36°
26
63°
35°
27
71°
42°
28
70°
33°
29
63°
33°
30
Hist. Avg.
67°
37°
1
Hist. Avg.
67°
37°
2
Hist. Avg.
66°
36°
3
Hist. Avg.
66°
36°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Riverton
Riverton's September 2026 forecast shows daily high temperatures ranging from 63° to 84°, with overnight lows between 33° and 51°. The average high for September is 74° with an average low of 43°. 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.
