S
M
T
W
T
F
S
26
39°
28°
27
50°
29°
28
57°
38°
29
59°
33°
30
64°
32°
1
72°
32°
2
69°
39°
3
76°
43°
4
59°
39°
5
50°
32°
6
74°
27°
7
65°
47°
8
74°
41°
9
70°
48°
10
79°
42°
11
77°
46°
12
80°
42°
13
84°
48°
14
64°
48°
15
63°
45°
16
52°
39°
17
45°
33°
18
55°
33°
19
63°
29°
20
61°
34°
21
59°
41°
22
66°
37°
23
76°
40°
24
81°
45°
25
86°
51°
26
80°
53°
27
78°
54°
28
86°
56°
29
84°
52°
30
71°
47°
31
82°
51°
1
84°
54°
2
83°
56°
3
82°
56°
4
83°
59°
5
82°
56°
6
81°
58°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in East Helena
East Helena's May 2026 forecast shows daily high temperatures ranging from 71° to 86°, with overnight lows between 47° and 59°. The average high for May is 82° with an average low of 54°. 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 East Helena. See also: June | July | August.
