S
M
T
W
T
F
S
26
37°
14°
27
38°
18°
28
53°
15°
29
51°
19°
30
59°
24°
1
70°
22°
2
65°
33°
3
77°
31°
4
48°
32°
5
47°
20°
6
56°
12°
7
64°
17°
8
73°
30°
9
63°
26°
10
72°
23°
11
78°
47°
12
74°
38°
13
84°
33°
14
68°
48°
15
64°
37°
16
63°
34°
17
47°
35°
18
46°
30°
19
63°
30°
20
67°
34°
21
61°
40°
22
65°
39°
23
75°
48°
24
86°
52°
25
93°
62°
26
88°
63°
27
81°
58°
28
73°
58°
29
79°
54°
30
80°
56°
31
74°
57°
1
75°
55°
2
79°
57°
3
74°
48°
4
68°
50°
5
68°
53°
6
67°
54°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Fort Peck Reservation
Fort Peck Reservation's May 2026 forecast shows daily high temperatures ranging from 61° to 93°, with overnight lows between 39° and 63°. The average high for May is 76° with an average low of 53°. 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 Fort Peck Reservation. See also: June | July | August.
