S
M
T
W
T
F
S
30
80°
60°
31
82°
64°
1
86°
57°
2
84°
58°
3
79°
57°
4
80°
58°
5
80°
65°
6
84°
63°
7
86°
63°
8
79°
62°
9
78°
63°
10
82°
62°
11
82°
61°
12
81°
62°
13
80°
59°
14
76°
55°
15
76°
55°
16
75°
54°
17
75°
54°
18
76°
59°
19
78°
59°
20
79°
60°
21
80°
56°
22
76°
52°
23
73°
58°
24
72°
59°
25
78°
53°
26
77°
50°
27
Hist. Avg.
75°
56°
28
Hist. Avg.
75°
56°
29
Hist. Avg.
74°
55°
30
Hist. Avg.
74°
55°
1
Hist. Avg.
73°
54°
2
Hist. Avg.
73°
54°
3
Hist. Avg.
72°
54°
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 72° to 86°, with overnight lows between 50° and 65°. The average high for September is 79° with an average low of 59°. 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.
