S
M
T
W
T
F
S
26
28°
16°
27
46°
18°
28
55°
19°
29
59°
19°
30
68°
27°
1
66°
34°
2
68°
39°
3
72°
36°
4
57°
37°
5
50°
30°
6
72°
23°
7
66°
43°
8
68°
36°
9
64°
45°
10
70°
39°
11
61°
41°
12
73°
32°
13
72°
43°
14
63°
39°
15
57°
36°
16
39°
32°
17
50°
32°
18
54°
25°
19
63°
34°
20
54°
39°
21
63°
36°
22
64°
41°
23
73°
44°
24
73°
47°
25
76°
48°
26
69°
46°
27
62°
47°
28
74°
54°
29
80°
52°
30
71°
47°
31
72°
48°
1
70°
48°
2
72°
47°
3
75°
51°
4
75°
51°
5
68°
43°
6
67°
45°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Black Diamond
Black Diamond's May 2026 forecast shows daily high temperatures ranging from 62° to 80°, with overnight lows between 43° and 54°. The average high for May is 72° 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 Black Diamond. See also: June | July | August.
