S
M
T
W
T
F
S
31
75°
38°
1
72°
49°
2
76°
45°
3
84°
52°
4
89°
60°
5
92°
63°
6
90°
64°
7
80°
57°
8
79°
51°
9
83°
54°
10
79°
58°
11
88°
63°
12
88°
60°
13
82°
58°
14
84°
58°
15
80°
61°
16
81°
56°
17
74°
53°
18
76°
59°
19
81°
59°
20
78°
58°
21
82°
54°
22
75°
53°
23
75°
53°
24
76°
59°
25
83°
62°
26
83°
60°
27
81°
55°
28
77°
55°
29
78°
56°
30
75°
54°
1
77°
56°
2
78°
55°
3
82°
58°
4
84°
61°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
June Weather in Keystone
Keystone's June 2026 forecast shows daily high temperatures ranging from 74° to 92°, with overnight lows between 51° and 64°. The average high for June is 81° with an average low of 57°. 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 Keystone. See also: July | August | September.
