S
M
T
W
T
F
S
26
67°
52°
27
69°
51°
28
76°
47°
29
81°
50°
30
85°
53°
1
87°
57°
2
92°
55°
3
79°
56°
4
68°
53°
5
73°
52°
6
84°
55°
7
93°
59°
8
94°
58°
9
93°
57°
10
96°
64°
11
92°
60°
12
94°
62°
13
95°
62°
14
84°
53°
15
79°
54°
16
80°
56°
17
82°
55°
18
81°
55°
19
80°
52°
20
81°
57°
21
88°
59°
22
89°
60°
23
90°
60°
24
90°
59°
25
89°
60°
26
90°
59°
27
89°
60°
28
90°
59°
29
89°
59°
30
86°
56°
31
85°
58°
1
85°
59°
2
89°
61°
3
92°
61°
4
92°
60°
5
91°
61°
6
89°
61°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Grangeville
Grangeville's May 2026 forecast shows daily high temperatures ranging from 68° to 96°, with overnight lows between 52° and 64°. The average high for May is 87° with an average low of 58°. 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 Grangeville. See also: June | July | August.
