S
M
T
W
T
F
S
26
87°
66°
27
87°
65°
28
86°
64°
29
86°
64°
30
85°
59°
31
79°
58°
1
79°
58°
2
80°
59°
3
81°
60°
4
81°
58°
5
82°
58°
6
84°
62°
7
82°
64°
8
82°
63°
9
81°
63°
10
82°
57°
11
82°
56°
12
82°
57°
13
83°
62°
14
85°
63°
15
86°
61°
16
85°
64°
17
87°
63°
18
86°
61°
19
83°
55°
20
79°
55°
21
79°
56°
22
80°
55°
23
79°
54°
24
79°
55°
25
81°
55°
26
83°
54°
27
83°
55°
28
80°
58°
29
80°
57°
30
77°
55°
31
80°
59°
1
83°
52°
2
80°
53°
3
76°
52°
4
77°
53°
5
77°
60°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Arlington Heights
Arlington Heights's August 2026 forecast shows daily high temperatures ranging from 76° to 87°, with overnight lows between 52° and 66°. The average high for August is 82° with an average low of 59°. 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 Arlington Heights. See also: September | October | November.
