S
M
T
W
T
F
S
31
84°
54°
1
83°
57°
2
82°
58°
3
82°
56°
4
87°
59°
5
85°
60°
6
78°
61°
7
81°
60°
8
78°
56°
9
80°
55°
10
82°
56°
11
84°
60°
12
85°
61°
13
86°
59°
14
87°
59°
15
87°
60°
16
84°
57°
17
86°
61°
18
85°
60°
19
84°
60°
20
85°
59°
21
83°
61°
22
81°
60°
23
83°
58°
24
84°
60°
25
84°
60°
26
85°
59°
27
87°
61°
28
88°
61°
29
88°
62°
30
87°
63°
1
87°
62°
2
88°
63°
3
89°
64°
4
88°
63°
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 78° to 89°, with overnight lows between 55° and 64°. The average high for June is 85° with an average low of 60°. 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.
