S
M
T
W
T
F
S
30
90°
63°
31
91°
64°
1
91°
63°
2
92°
65°
3
92°
64°
4
93°
64°
5
94°
62°
6
90°
61°
7
90°
61°
8
91°
62°
9
93°
63°
10
91°
64°
11
92°
61°
12
89°
60°
13
90°
59°
14
88°
57°
15
87°
56°
16
88°
57°
17
87°
62°
18
91°
57°
19
95°
57°
20
92°
63°
21
86°
56°
22
86°
55°
23
Hist. Avg.
88°
58°
24
Hist. Avg.
88°
58°
25
Hist. Avg.
87°
58°
26
Hist. Avg.
87°
57°
27
Hist. Avg.
87°
57°
28
Hist. Avg.
86°
56°
29
Hist. Avg.
86°
56°
30
Hist. Avg.
86°
56°
1
Hist. Avg.
86°
55°
2
Hist. Avg.
85°
55°
3
Hist. Avg.
85°
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 86° to 95°, with overnight lows between 55° and 65°. The average high for September is 90° with an average low of 61°. 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.
