S
M
T
W
T
F
S
26
63°
52°
27
67°
48°
28
74°
48°
29
74°
48°
30
75°
49°
1
72°
53°
2
61°
54°
3
66°
54°
4
68°
52°
5
62°
52°
6
73°
52°
7
76°
53°
8
70°
53°
9
73°
52°
10
74°
53°
11
89°
48°
12
74°
53°
13
67°
56°
14
80°
48°
15
79°
49°
16
69°
50°
17
76°
49°
18
82°
63°
19
87°
50°
20
87°
53°
21
88°
57°
22
79°
52°
23
71°
54°
24
73°
55°
25
68°
55°
26
71°
49°
27
74°
54°
28
72°
53°
29
70°
52°
30
74°
49°
31
82°
50°
1
87°
50°
2
79°
54°
3
81°
53°
4
79°
55°
5
78°
54°
6
78°
53°
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 70° to 87°, with overnight lows between 49° and 55°. The average high for May is 77° with an average low of 52°. 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.
