S
M
T
W
T
F
S
31
66°
41°
1
67°
45°
2
69°
50°
3
74°
46°
4
77°
48°
5
80°
54°
6
76°
62°
7
70°
58°
8
82°
53°
9
81°
62°
10
82°
67°
11
84°
64°
12
75°
60°
13
78°
56°
14
73°
54°
15
60°
50°
16
68°
56°
17
70°
61°
18
71°
51°
19
68°
52°
20
67°
50°
21
69°
52°
22
72°
55°
23
74°
55°
24
75°
56°
25
74°
58°
26
76°
59°
27
75°
56°
28
71°
53°
29
72°
53°
30
72°
54°
1
73°
53°
2
74°
60°
3
74°
57°
4
75°
56°
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 60° to 76°, with overnight lows between 50° and 61°. The average high for June is 72° with an average low of 55°. 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.
