S
M
T
W
T
F
S
26
29°
22°
27
49°
18°
28
56°
22°
29
57°
22°
30
64°
22°
1
67°
27°
2
66°
32°
3
70°
26°
4
51°
34°
5
46°
23°
6
69°
21°
7
69°
36°
8
67°
30°
9
64°
40°
10
69°
34°
11
64°
36°
12
71°
27°
13
69°
35°
14
56°
45°
15
53°
37°
16
51°
33°
17
46°
27°
18
56°
26°
19
59°
33°
20
47°
29°
21
61°
28°
22
65°
29°
23
67°
31°
24
63°
41°
25
56°
43°
26
49°
40°
27
48°
37°
28
58°
41°
29
62°
42°
30
56°
31°
31
55°
26°
1
54°
32°
2
60°
34°
3
59°
37°
4
58°
37°
5
57°
33°
6
55°
30°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Flathead
Flathead's May 2026 forecast shows daily high temperatures ranging from 48° to 63°, with overnight lows between 26° and 43°. The average high for May is 56° with an average low of 36°. 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 Flathead. See also: June | July | August.
