S
M
T
W
T
F
S
30
85°
58°
31
84°
55°
1
84°
56°
2
85°
57°
3
87°
58°
4
87°
60°
5
88°
60°
6
88°
59°
7
87°
61°
8
88°
60°
9
87°
59°
10
81°
59°
11
79°
60°
12
85°
61°
13
86°
62°
14
87°
60°
15
86°
59°
16
84°
58°
17
82°
59°
18
84°
59°
19
86°
58°
20
78°
51°
21
76°
51°
22
Hist. Avg.
84°
60°
23
Hist. Avg.
84°
60°
24
Hist. Avg.
83°
60°
25
Hist. Avg.
83°
59°
26
Hist. Avg.
82°
59°
27
Hist. Avg.
82°
59°
28
Hist. Avg.
82°
58°
29
Hist. Avg.
82°
58°
30
Hist. Avg.
81°
58°
1
Hist. Avg.
81°
58°
2
Hist. Avg.
80°
57°
3
Hist. Avg.
80°
57°
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 76° to 88°, with overnight lows between 51° and 62°. The average high for September is 85° with an average low of 58°. 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.
