S
M
T
W
T
F
S
30
80°
58°
31
82°
62°
1
85°
62°
2
85°
61°
3
84°
59°
4
84°
62°
5
83°
61°
6
78°
61°
7
78°
60°
8
78°
61°
9
82°
56°
10
80°
55°
11
77°
61°
12
82°
60°
13
82°
59°
14
77°
60°
15
82°
59°
16
75°
57°
17
74°
59°
18
Hist. Avg.
77°
54°
19
Hist. Avg.
77°
54°
20
Hist. Avg.
77°
53°
21
Hist. Avg.
76°
53°
22
Hist. Avg.
76°
53°
23
Hist. Avg.
76°
52°
24
Hist. Avg.
75°
52°
25
Hist. Avg.
75°
51°
26
Hist. Avg.
74°
51°
27
Hist. Avg.
74°
50°
28
Hist. Avg.
74°
50°
29
Hist. Avg.
74°
50°
30
Hist. Avg.
73°
49°
1
Hist. Avg.
73°
49°
2
Hist. Avg.
73°
48°
3
Hist. Avg.
72°
48°
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 74° to 85°, with overnight lows between 55° and 62°. The average high for September is 80° with an average low of 60°. 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.
