S
M
T
W
T
F
S
26
87°
70°
27
86°
75°
28
87°
75°
29
85°
71°
30
84°
67°
1
67°
54°
2
76°
52°
3
78°
49°
4
79°
53°
5
81°
68°
6
85°
75°
7
78°
61°
8
74°
64°
9
78°
69°
10
86°
67°
11
77°
68°
12
85°
64°
13
89°
63°
14
88°
65°
15
85°
67°
16
85°
68°
17
87°
75°
18
88°
76°
19
89°
66°
20
78°
68°
21
80°
71°
22
86°
67°
23
79°
68°
24
81°
67°
25
88°
70°
26
86°
69°
27
78°
67°
28
84°
72°
29
89°
74°
30
89°
73°
31
88°
74°
1
89°
71°
2
94°
69°
3
86°
68°
4
84°
69°
5
86°
70°
6
87°
73°
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 84° to 94°, with overnight lows between 68° and 74°. The average high for May is 88° with an average low of 71°. 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.
