S
M
T
W
T
F
S
30
85°
58°
31
80°
67°
1
91°
72°
2
73°
69°
3
88°
69°
4
86°
72°
5
81°
66°
6
79°
63°
7
81°
61°
8
83°
65°
9
88°
72°
10
87°
68°
11
80°
56°
12
78°
60°
13
83°
61°
14
82°
60°
15
81°
59°
16
76°
56°
17
75°
58°
18
77°
58°
19
76°
57°
20
80°
58°
21
79°
60°
22
71°
60°
23
71°
59°
24
72°
59°
25
73°
57°
26
78°
56°
27
74°
52°
28
75°
57°
29
77°
58°
30
78°
57°
1
77°
57°
2
76°
56°
3
75°
55°
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 71° to 88°, with overnight lows between 52° and 72°. The average high for September is 78° 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.
