S
M
T
W
T
F
S
26
50°
27°
27
53°
26°
28
56°
36°
29
62°
36°
30
65°
31°
1
72°
31°
2
74°
37°
3
77°
39°
4
68°
41°
5
63°
38°
6
69°
31°
7
74°
44°
8
70°
42°
9
77°
42°
10
80°
46°
11
75°
42°
12
78°
46°
13
78°
45°
14
73°
43°
15
72°
47°
16
71°
43°
17
72°
44°
18
73°
43°
19
72°
45°
20
68°
44°
21
64°
47°
22
62°
42°
23
63°
41°
24
69°
43°
25
72°
46°
26
73°
48°
27
67°
45°
28
71°
45°
29
66°
44°
30
69°
46°
31
73°
48°
1
75°
49°
2
74°
47°
3
64°
41°
4
62°
39°
5
66°
42°
6
74°
48°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Missoula
Missoula's May 2026 forecast shows daily high temperatures ranging from 62° to 80°, with overnight lows between 39° and 49°. The average high for May is 71° with an average low of 44°. 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 Missoula. See also: June | July | August.
