S
M
T
W
T
F
S
31
77°
46°
1
82°
50°
2
78°
50°
3
83°
46°
4
86°
65°
5
77°
61°
6
84°
58°
7
81°
56°
8
84°
62°
9
83°
64°
10
84°
67°
11
88°
67°
12
85°
66°
13
81°
61°
14
77°
60°
15
75°
58°
16
74°
56°
17
77°
55°
18
77°
59°
19
78°
58°
20
77°
56°
21
74°
52°
22
72°
55°
23
75°
61°
24
82°
62°
25
83°
58°
26
75°
54°
27
74°
56°
28
76°
61°
29
77°
61°
30
78°
60°
1
77°
60°
2
80°
61°
3
83°
62°
4
84°
63°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
June Weather in Thornton
Thornton's June 2026 forecast shows daily high temperatures ranging from 72° to 88°, with overnight lows between 52° and 67°. The average high for June is 79° 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 Thornton. See also: July | August | September.
