S
M
T
W
T
F
S
31
84°
69°
1
89°
67°
2
84°
66°
3
80°
61°
4
83°
58°
5
85°
63°
6
86°
65°
7
84°
71°
8
85°
71°
9
88°
72°
10
88°
69°
11
91°
73°
12
89°
74°
13
93°
75°
14
91°
72°
15
84°
71°
16
73°
70°
17
82°
71°
18
82°
71°
19
86°
71°
20
80°
69°
21
89°
69°
22
91°
76°
23
83°
71°
24
88°
69°
25
87°
70°
26
90°
73°
27
91°
72°
28
93°
70°
29
94°
70°
30
91°
69°
1
92°
68°
2
90°
68°
3
91°
69°
4
89°
68°
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 87° to 94°, with overnight lows between 68° and 73°. The average high for June is 91° with an average low of 70°. 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.
