S
M
T
W
T
F
S
26
61°
35°
27
65°
40°
28
60°
48°
29
50°
35°
30
50°
31°
1
48°
29°
2
43°
27°
3
59°
26°
4
69°
41°
5
60°
44°
6
49°
37°
7
51°
32°
8
57°
33°
9
62°
35°
10
52°
32°
11
52°
31°
12
55°
28°
13
54°
40°
14
54°
40°
15
64°
36°
16
68°
41°
17
82°
46°
18
83°
62°
19
81°
53°
20
56°
40°
21
61°
40°
22
61°
40°
23
55°
45°
24
60°
45°
25
73°
49°
26
80°
49°
27
74°
50°
28
65°
47°
29
73°
43°
30
N/A
31
69°
47°
1
66°
48°
2
69°
49°
3
75°
52°
4
74°
58°
5
72°
56°
6
70°
52°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
May Weather in Grand Valley
Grand Valley's May 2026 forecast shows daily high temperatures ranging from 66° to 75°, with overnight lows between 47° and 58°. The average high for May is 71° with an average low of 52°. 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 Grand Valley. See also: June | July | August.
