S
M
T
W
T
F
S
30
84°
69°
31
84°
68°
1
86°
69°
2
82°
64°
3
83°
66°
4
84°
65°
5
83°
64°
6
81°
63°
7
83°
66°
8
86°
67°
9
87°
66°
10
88°
67°
11
90°
66°
12
89°
63°
13
91°
54°
14
84°
62°
15
88°
64°
16
85°
60°
17
84°
59°
18
78°
63°
19
87°
59°
20
76°
57°
21
77°
56°
22
80°
52°
23
75°
52°
24
78°
53°
25
77°
54°
26
77°
54°
27
83°
55°
28
82°
51°
29
77°
55°
30
83°
61°
1
84°
46°
2
85°
44°
3
77°
46°
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 75° to 91°, with overnight lows between 44° and 69°. The average high for September is 83° 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.
