S
M
T
W
T
F
S
26
52°
34°
27
54°
34°
28
46°
30°
29
50°
21°
30
48°
19°
1
46°
19°
2
58°
28°
3
56°
30°
4
51°
33°
5
44°
22°
6
47°
29°
7
57°
34°
8
60°
33°
9
62°
31°
10
63°
31°
11
58°
32°
12
58°
31°
13
59°
32°
14
58°
28°
15
51°
27°
16
52°
24°
17
52°
25°
18
53°
25°
19
55°
26°
20
55°
28°
21
53°
28°
22
54°
26°
23
55°
26°
24
52°
25°
25
52°
25°
26
53°
24°
27
55°
24°
28
57°
26°
29
62°
28°
30
67°
35°
31
63°
36°
1
63°
34°
2
64°
31°
3
66°
32°
4
68°
34°
5
68°
35°
6
67°
37°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Grand Lake
Grand Lake's May 2026 forecast shows daily high temperatures ranging from 44° to 68°, with overnight lows between 19° and 37°. The average high for May is 57° with an average low of 29°. 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 Lake. See also: June | July | August.
