S
M
T
W
T
F
S
26
79°
46°
27
85°
47°
28
84°
63°
29
71°
65°
30
76°
62°
31
82°
58°
1
86°
68°
2
85°
70°
3
79°
66°
4
84°
67°
5
82°
68°
6
86°
69°
7
85°
68°
8
84°
67°
9
84°
66°
10
85°
64°
11
83°
62°
12
79°
60°
13
79°
59°
14
78°
61°
15
80°
60°
16
78°
59°
17
78°
64°
18
78°
61°
19
79°
63°
20
77°
61°
21
77°
59°
22
78°
62°
23
81°
64°
24
83°
64°
25
82°
63°
26
77°
62°
27
76°
62°
28
76°
63°
29
78°
63°
30
81°
62°
31
79°
61°
1
81°
57°
2
74°
55°
3
73°
57°
4
73°
56°
5
74°
53°
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 73° to 86°, with overnight lows between 53° and 70°. The average high for August is 80° with an average low of 62°. 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.
