S
M
T
W
T
F
S
31
87°
62°
1
86°
60°
2
87°
59°
3
83°
60°
4
80°
63°
5
81°
66°
6
82°
66°
7
84°
63°
8
88°
64°
9
89°
67°
10
89°
68°
11
88°
67°
12
89°
67°
13
89°
68°
14
84°
68°
15
83°
67°
16
86°
68°
17
86°
64°
18
87°
65°
19
89°
69°
20
90°
68°
21
91°
65°
22
90°
64°
23
85°
62°
24
85°
62°
25
86°
63°
26
87°
63°
27
87°
66°
28
90°
68°
29
90°
67°
30
88°
67°
1
87°
70°
2
86°
66°
3
85°
69°
4
89°
69°
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 80° to 91°, with overnight lows between 59° and 70°. The average high for June is 87° with an average low of 65°. 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.
