S
M
T
W
T
F
S
26
37°
25°
27
38°
25°
28
44°
29°
29
50°
31°
30
55°
37°
1
59°
43°
2
74°
52°
3
75°
52°
4
71°
44°
5
68°
49°
6
73°
48°
7
68°
44°
8
65°
41°
9
58°
47°
10
64°
49°
11
68°
50°
12
64°
45°
13
61°
46°
14
63°
45°
15
62°
38°
16
58°
43°
17
61°
42°
18
56°
35°
19
55°
34°
20
57°
33°
21
64°
38°
22
68°
44°
23
64°
39°
24
67°
44°
25
69°
45°
26
68°
44°
27
63°
44°
28
65°
43°
29
68°
40°
30
69°
45°
31
71°
46°
1
72°
47°
2
71°
46°
3
72°
47°
4
71°
47°
5
71°
46°
6
70°
47°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Mullan
Mullan's May 2026 forecast shows daily high temperatures ranging from 55° to 75°, with overnight lows between 33° and 52°. The average high for May is 66° 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 Mullan. See also: June | July | August.