S
M
T
W
T
F
S
31
70°
55°
1
66°
55°
2
68°
55°
3
70°
54°
4
66°
54°
5
63°
52°
6
63°
50°
7
64°
52°
8
63°
48°
9
61°
46°
10
57°
46°
11
63°
48°
12
72°
57°
13
64°
52°
14
66°
48°
15
68°
46°
16
73°
55°
17
70°
61°
18
75°
59°
19
79°
61°
20
73°
63°
21
77°
59°
22
N/A
23
91°
66°
24
90°
62°
25
93°
69°
26
89°
68°
27
80°
61°
28
75°
55°
29
74°
56°
30
72°
55°
1
72°
55°
2
71°
54°
3
68°
53°
4
69°
54°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
June Weather in Thornton
Thornton's June 2026 forecast shows daily high temperatures ranging from 68° to 93°, with overnight lows between 53° and 69°. The average high for June is 79° with an average low of 59°. 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.
