S
M
T
W
T
F
S
31
66°
52°
1
66°
55°
2
63°
50°
3
61°
50°
4
61°
48°
5
61°
46°
6
59°
48°
7
63°
50°
8
62°
49°
9
61°
48°
10
64°
51°
11
62°
49°
12
64°
50°
13
66°
51°
14
58°
47°
15
59°
50°
16
61°
50°
17
58°
47°
18
59°
47°
19
59°
48°
20
60°
49°
21
60°
51°
22
61°
50°
23
60°
48°
24
60°
49°
25
61°
48°
26
60°
49°
27
61°
50°
28
60°
49°
29
61°
53°
30
62°
52°
1
61°
50°
2
61°
52°
3
62°
51°
4
61°
50°
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 58° to 66°, with overnight lows between 46° and 55°. The average high for June is 61° with an average low of 50°. 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.
