S
M
T
W
T
F
S
26
92°
73°
27
92°
71°
28
93°
75°
29
94°
74°
30
95°
75°
31
95°
75°
1
94°
74°
2
95°
75°
3
96°
75°
4
96°
74°
5
95°
74°
6
94°
75°
7
95°
74°
8
94°
75°
9
95°
74°
10
95°
73°
11
94°
74°
12
94°
73°
13
93°
73°
14
94°
72°
15
88°
67°
16
87°
67°
17
88°
69°
18
91°
71°
19
92°
72°
20
93°
72°
21
93°
71°
22
92°
72°
23
92°
71°
24
93°
70°
25
93°
71°
26
91°
70°
27
90°
69°
28
92°
70°
29
91°
68°
30
88°
68°
31
90°
70°
1
89°
70°
2
88°
63°
3
85°
62°
4
83°
61°
5
83°
63°
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 83° to 96°, with overnight lows between 61° and 75°. The average high for August is 92° with an average low of 71°. 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.
