S
M
T
W
T
F
S
26
36°
19°
27
39°
23°
28
43°
18°
29
45°
27°
30
48°
21°
1
59°
27°
2
61°
29°
3
60°
31°
4
57°
33°
5
60°
30°
6
60°
37°
7
66°
39°
8
61°
38°
9
63°
37°
10
62°
35°
11
61°
34°
12
62°
35°
13
58°
33°
14
51°
28°
15
50°
29°
16
52°
28°
17
53°
29°
18
56°
35°
19
53°
34°
20
52°
33°
21
53°
33°
22
54°
32°
23
52°
31°
24
53°
30°
25
54°
29°
26
55°
30°
27
60°
33°
28
64°
39°
29
65°
39°
30
59°
40°
31
65°
40°
1
62°
39°
2
60°
35°
3
63°
38°
4
64°
42°
5
63°
43°
6
62°
43°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Yellowstone National Park
Yellowstone National Park's May 2026 forecast shows daily high temperatures ranging from 48° to 66°, with overnight lows between 21° and 43°. The average high for May is 58° with an average low of 34°. 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 National Park. See also: June | July | August.
