S
M
T
W
T
F
S
30
78°
64°
31
83°
59°
1
79°
53°
2
81°
57°
3
84°
63°
4
75°
62°
5
79°
61°
6
81°
63°
7
80°
64°
8
82°
55°
9
74°
48°
10
80°
60°
11
79°
51°
12
69°
48°
13
64°
49°
14
64°
48°
15
65°
46°
16
67°
49°
17
70°
52°
18
66°
48°
19
67°
48°
20
70°
43°
21
66°
51°
22
69°
52°
23
72°
52°
24
72°
51°
25
67°
50°
26
69°
50°
27
70°
51°
28
69°
51°
29
68°
49°
30
62°
48°
1
57°
44°
2
55°
38°
3
55°
38°
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 55° to 82°, with overnight lows between 38° and 60°. The average high for September is 68° with an average low of 49°. 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.
