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
73°
45°
8
71°
40°
9
72°
37°
10
79°
38°
11
76°
46°
12
82°
37°
13
69°
46°
14
60°
44°
15
59°
41°
16
52°
40°
17
53°
37°
18
61°
26°
19
57°
32°
20
56°
36°
21
63°
38°
22
70°
34°
23
76°
37°
24
79°
45°
25
84°
50°
26
64°
48°
27
68°
50°
28
78°
55°
29
76°
53°
30
70°
45°
31
78°
44°
1
76°
47°
2
83°
50°
3
83°
47°
4
81°
48°
5
79°
48°
6
74°
44°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Flathead Reservation
Flathead Reservation's May 2026 forecast shows daily high temperatures ranging from 64° to 84°, with overnight lows between 44° and 55°. The average high for May is 77° with an average low of 48°. 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 Reservation. See also: June | July | August.
