S
M
T
W
T
F
S
26
38°
27°
27
38°
28°
28
56°
27°
29
58°
36°
30
61°
34°
1
72°
39°
2
71°
46°
3
77°
45°
4
57°
39°
5
51°
35°
6
69°
28°
7
65°
50°
8
77°
46°
9
65°
51°
10
80°
43°
11
82°
53°
12
75°
45°
13
95°
48°
14
75°
52°
15
71°
45°
16
71°
40°
17
55°
35°
18
50°
34°
19
63°
29°
20
67°
43°
21
55°
42°
22
68°
41°
23
77°
47°
24
85°
50°
25
88°
53°
26
88°
55°
27
88°
60°
28
91°
62°
29
94°
61°
30
74°
55°
31
72°
50°
1
74°
46°
2
74°
47°
3
74°
49°
4
77°
52°
5
80°
52°
6
88°
55°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in South Yellowstone
South Yellowstone's May 2026 forecast shows daily high temperatures ranging from 72° to 94°, with overnight lows between 46° and 62°. The average high for May is 81° with an average low of 54°. 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 South Yellowstone. See also: June | July | August.
