S
M
T
W
T
F
S
26
86°
57°
27
86°
64°
28
79°
64°
29
75°
61°
30
66°
50°
1
67°
50°
2
66°
43°
3
70°
50°
4
78°
55°
5
78°
64°
6
72°
51°
7
64°
40°
8
70°
46°
9
76°
51°
10
76°
55°
11
77°
57°
12
79°
55°
13
79°
56°
14
78°
54°
15
77°
59°
16
79°
58°
17
80°
59°
18
81°
59°
19
79°
60°
20
82°
60°
21
82°
59°
22
81°
61°
23
78°
61°
24
77°
60°
25
80°
61°
26
81°
61°
27
76°
59°
28
77°
58°
29
80°
60°
30
78°
56°
31
79°
62°
1
81°
62°
2
85°
63°
3
85°
63°
4
84°
62°
5
79°
61°
6
78°
58°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Riverton
Riverton's May 2026 forecast shows daily high temperatures ranging from 64° to 85°, with overnight lows between 40° and 64°. The average high for May is 78° with an average low of 57°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how May weather will actually feel in Riverton. See also: June | July | August.
