S
M
T
W
T
F
S
26
54°
30°
27
58°
31°
28
62°
33°
29
65°
33°
30
71°
31°
1
73°
32°
2
79°
38°
3
79°
37°
4
75°
37°
5
71°
43°
6
76°
38°
7
72°
43°
8
67°
42°
9
70°
38°
10
72°
37°
11
71°
40°
12
80°
36°
13
64°
46°
14
60°
40°
15
54°
35°
16
50°
34°
17
58°
32°
18
60°
38°
19
64°
43°
20
69°
44°
21
70°
36°
22
72°
44°
23
78°
38°
24
75°
45°
25
79°
40°
26
61°
49°
27
76°
53°
28
90°
54°
29
75°
54°
30
61°
48°
31
67°
49°
1
59°
45°
2
70°
46°
3
77°
53°
4
71°
51°
5
76°
46°
6
69°
43°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Diamond Lake
Diamond Lake's May 2026 forecast shows daily high temperatures ranging from 59° to 77°, with overnight lows between 43° and 53°. The average high for May is 70° with an average low of 48°. 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 Diamond Lake. See also: June | July | August.
