S
M
T
W
T
F
S
26
59°
39°
27
64°
41°
28
69°
43°
29
68°
45°
30
68°
45°
1
70°
44°
2
71°
48°
3
72°
49°
4
72°
50°
5
73°
49°
6
68°
44°
7
65°
42°
8
62°
41°
9
65°
47°
10
70°
48°
11
75°
48°
12
77°
51°
13
78°
53°
14
79°
54°
15
78°
54°
16
79°
53°
17
78°
55°
18
73°
54°
19
79°
48°
20
81°
53°
21
79°
45°
22
69°
47°
23
71°
51°
24
78°
45°
25
76°
52°
26
78°
47°
27
76°
44°
28
73°
44°
29
72°
51°
30
77°
50°
31
85°
53°
1
84°
55°
2
86°
58°
3
87°
60°
4
87°
54°
5
86°
51°
6
81°
49°
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 59° to 87°, with overnight lows between 39° and 60°. The average high for May is 75° with an average low of 49°. 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.
