S
M
T
W
T
F
S
26
47°
34°
27
45°
35°
28
46°
35°
29
47°
31°
30
43°
27°
1
43°
32°
2
43°
32°
3
50°
35°
4
46°
37°
5
50°
35°
6
45°
37°
7
45°
34°
8
49°
33°
9
52°
36°
10
49°
36°
11
49°
35°
12
55°
29°
13
56°
33°
14
55°
40°
15
56°
43°
16
54°
42°
17
52°
39°
18
51°
39°
19
48°
36°
20
52°
33°
21
47°
39°
22
50°
32°
23
48°
35°
24
55°
32°
25
58°
38°
26
53°
37°
27
54°
37°
28
56°
38°
29
60°
43°
30
54°
41°
31
56°
42°
1
59°
41°
2
69°
44°
3
64°
46°
4
65°
46°
5
63°
44°
6
61°
46°
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 53° to 69°, with overnight lows between 37° and 46°. The average high for May is 59° with an average low of 42°. 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.
