S
M
T
W
T
F
S
26
85°
69°
27
90°
72°
28
91°
69°
29
85°
70°
30
86°
72°
31
90°
70°
1
91°
75°
2
82°
74°
3
82°
71°
4
85°
72°
5
89°
70°
6
89°
71°
7
89°
70°
8
90°
68°
9
91°
70°
10
90°
68°
11
90°
67°
12
86°
66°
13
87°
67°
14
89°
69°
15
85°
65°
16
82°
64°
17
83°
68°
18
88°
66°
19
82°
65°
20
82°
65°
21
86°
69°
22
88°
68°
23
85°
65°
24
81°
63°
25
82°
63°
26
81°
62°
27
80°
63°
28
83°
66°
29
85°
67°
30
86°
68°
31
87°
69°
1
86°
68°
2
86°
67°
3
79°
64°
4
79°
61°
5
78°
60°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in McLean
McLean's August 2026 forecast shows daily high temperatures ranging from 78° to 91°, with overnight lows between 60° and 75°. The average high for August is 85° with an average low of 67°. 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 McLean. See also: September | October | November.
