S
M
T
W
T
F
S
31
N/A
1
65°
56°
2
64°
56°
3
63°
55°
4
61°
52°
5
62°
51°
6
64°
53°
7
65°
54°
8
64°
53°
9
63°
53°
10
63°
54°
11
66°
53°
12
65°
54°
13
62°
47°
14
61°
48°
15
62°
47°
16
62°
53°
17
63°
50°
18
62°
48°
19
62°
48°
20
63°
50°
21
64°
53°
22
63°
53°
23
63°
52°
24
64°
51°
25
63°
50°
26
62°
50°
27
64°
51°
28
63°
50°
29
63°
54°
30
64°
53°
1
64°
50°
2
65°
54°
3
65°
53°
4
64°
51°
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 61° to 66°, with overnight lows between 47° and 56°. The average high for June is 63° with an average low of 52°. 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.
