S
M
T
W
T
F
S
31
84°
54°
1
83°
57°
2
82°
58°
3
84°
57°
4
84°
58°
5
82°
58°
6
79°
57°
7
79°
59°
8
81°
59°
9
82°
57°
10
89°
61°
11
91°
62°
12
94°
62°
13
90°
63°
14
89°
61°
15
91°
62°
16
90°
63°
17
87°
64°
18
84°
63°
19
83°
60°
20
80°
58°
21
82°
57°
22
83°
58°
23
84°
59°
24
88°
61°
25
91°
62°
26
91°
64°
27
90°
62°
28
87°
60°
29
90°
63°
30
89°
63°
1
89°
62°
2
87°
62°
3
89°
64°
4
90°
65°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
June Weather in Diamond Bar
Diamond Bar's June 2026 forecast shows daily high temperatures ranging from 80° to 91°, with overnight lows between 57° and 65°. The average high for June is 87° with an average low of 62°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how June weather will actually feel in Diamond Bar. See also: July | August | September.
