S
M
T
W
T
F
S
26
76°
52°
27
77°
53°
28
78°
56°
29
79°
57°
30
79°
56°
31
77°
57°
1
78°
54°
2
77°
53°
3
79°
59°
4
80°
54°
5
76°
52°
6
75°
51°
7
75°
55°
8
76°
59°
9
76°
56°
10
78°
59°
11
82°
60°
12
82°
58°
13
81°
58°
14
79°
53°
15
75°
53°
16
76°
52°
17
76°
54°
18
74°
57°
19
76°
59°
20
79°
52°
21
76°
51°
22
76°
49°
23
75°
50°
24
77°
54°
25
75°
52°
26
74°
51°
27
75°
48°
28
73°
49°
29
73°
49°
30
74°
50°
31
76°
54°
1
76°
52°
2
73°
48°
3
74°
49°
4
77°
47°
5
78°
55°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Thornton
Thornton's August 2026 forecast shows daily high temperatures ranging from 73° to 82°, with overnight lows between 47° and 60°. The average high for August is 77° with an average low of 54°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how August weather will actually feel in Thornton. See also: September | October | November.
