S
M
T
W
T
F
S
26
91°
72°
27
87°
70°
28
79°
63°
29
80°
61°
30
86°
67°
31
83°
67°
1
74°
66°
2
76°
61°
3
78°
64°
4
81°
67°
5
79°
63°
6
80°
65°
7
82°
68°
8
85°
69°
9
88°
68°
10
86°
69°
11
85°
70°
12
81°
65°
13
83°
67°
14
78°
62°
15
77°
61°
16
78°
68°
17
85°
68°
18
78°
66°
19
77°
64°
20
79°
66°
21
82°
61°
22
75°
61°
23
75°
60°
24
76°
60°
25
76°
59°
26
75°
58°
27
76°
62°
28
80°
63°
29
83°
66°
30
83°
66°
31
76°
67°
1
82°
65°
2
79°
61°
3
74°
58°
4
77°
62°
5
81°
64°
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 74° to 88°, with overnight lows between 58° and 70°. The average high for August is 80° with an average low of 64°. 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.
