S
M
T
W
T
F
S
26
64°
35°
27
59°
41°
28
52°
42°
29
69°
38°
30
71°
47°
1
67°
45°
2
66°
44°
3
70°
42°
4
68°
45°
5
65°
44°
6
66°
42°
7
66°
44°
8
64°
43°
9
63°
42°
10
57°
41°
11
58°
40°
12
59°
39°
13
65°
41°
14
68°
43°
15
68°
43°
16
67°
42°
17
59°
40°
18
63°
43°
19
62°
41°
20
61°
42°
21
61°
42°
22
60°
43°
23
60°
43°
24
64°
42°
25
70°
45°
26
65°
42°
27
64°
43°
28
60°
41°
29
62°
42°
30
61°
43°
31
60°
42°
1
61°
42°
2
65°
43°
3
71°
45°
4
70°
46°
5
64°
48°
6
64°
49°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Diablo
Diablo's May 2026 forecast shows daily high temperatures ranging from 52° to 71°, with overnight lows between 35° and 49°. The average high for May is 64° with an average low of 43°. 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 Diablo. See also: June | July | August.
