S
M
T
W
T
F
S
26
30°
19°
27
45°
19°
28
52°
23°
29
63°
30°
30
73°
39°
1
66°
43°
2
72°
34°
3
64°
41°
4
54°
32°
5
52°
23°
6
66°
34°
7
70°
43°
8
64°
37°
9
66°
45°
10
72°
48°
11
66°
48°
12
70°
46°
13
68°
43°
14
61°
45°
15
59°
34°
16
48°
28°
17
54°
27°
18
61°
27°
19
64°
34°
20
55°
36°
21
68°
34°
22
70°
48°
23
75°
46°
24
66°
47°
25
78°
53°
26
72°
48°
27
69°
49°
28
75°
55°
29
77°
56°
30
70°
48°
31
69°
50°
1
71°
46°
2
70°
49°
3
70°
49°
4
72°
48°
5
67°
46°
6
62°
48°
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 62° to 78°, with overnight lows between 46° and 56°. The average high for May is 71° 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 Yellowstone. See also: June | July | August.
