S
M
T
W
T
F
S
26
61°
41°
27
70°
35°
28
62°
38°
29
61°
48°
30
59°
46°
1
63°
35°
2
57°
43°
3
60°
40°
4
72°
35°
5
82°
53°
6
66°
51°
7
63°
45°
8
61°
38°
9
58°
49°
10
70°
48°
11
62°
46°
12
67°
34°
13
68°
47°
14
61°
49°
15
65°
48°
16
79°
42°
17
86°
55°
18
91°
59°
19
93°
64°
20
89°
61°
21
61°
52°
22
68°
50°
23
51°
49°
24
59°
55°
25
73°
58°
26
80°
59°
27
81°
59°
28
80°
51°
29
76°
49°
30
74°
47°
31
75°
49°
1
74°
51°
2
75°
53°
3
75°
54°
4
74°
53°
5
75°
52°
6
71°
49°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Montana
Montana's May 2026 forecast shows daily high temperatures ranging from 51° to 81°, with overnight lows between 47° and 59°. The average high for May is 73° with an average low of 53°. 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 Montana. See also: June | July | August.
