S
M
T
W
T
F
S
26
71°
43°
27
70°
51°
28
61°
46°
29
53°
40°
30
52°
37°
1
51°
34°
2
60°
30°
3
71°
44°
4
78°
46°
5
56°
39°
6
51°
33°
7
61°
29°
8
69°
38°
9
67°
46°
10
63°
38°
11
62°
35°
12
75°
40°
13
64°
47°
14
71°
46°
15
80°
55°
16
82°
60°
17
81°
61°
18
76°
62°
19
66°
50°
20
64°
44°
21
56°
44°
22
63°
46°
23
74°
56°
24
77°
56°
25
83°
58°
26
89°
59°
27
89°
53°
28
81°
50°
29
85°
57°
30
83°
53°
31
79°
51°
1
84°
53°
2
85°
55°
3
84°
54°
4
79°
56°
5
84°
60°
6
85°
59°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Yellowstone
Yellowstone's May 2026 forecast shows daily high temperatures ranging from 79° to 89°, with overnight lows between 50° and 60°. The average high for May is 84° with an average low of 55°. 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 Yellowstone. See also: June | July | August.
