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
75°
44°
4
56°
35°
5
49°
31°
6
63°
49°
7
69°
46°
8
70°
47°
9
63°
46°
10
65°
44°
11
78°
47°
12
78°
49°
13
76°
45°
14
76°
48°
15
75°
50°
16
66°
42°
17
67°
46°
18
71°
44°
19
60°
42°
20
61°
42°
21
61°
38°
22
68°
46°
23
72°
49°
24
67°
49°
25
63°
42°
26
69°
49°
27
62°
47°
28
62°
44°
29
63°
41°
30
64°
43°
31
70°
47°
1
74°
51°
2
76°
52°
3
76°
53°
4
77°
53°
5
76°
52°
6
77°
54°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Northwest Yellowstone
Northwest Yellowstone's May 2026 forecast shows daily high temperatures ranging from 49° to 78°, with overnight lows between 31° and 54°. The average high for May is 68° with an average low of 46°. 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 Northwest Yellowstone. See also: June | July | August.
