S
M
T
W
T
F
S
26
90°
72°
27
89°
72°
28
90°
73°
29
91°
72°
30
90°
72°
31
89°
71°
1
86°
71°
2
87°
69°
3
86°
71°
4
90°
72°
5
91°
71°
6
91°
72°
7
86°
70°
8
89°
70°
9
88°
69°
10
89°
63°
11
84°
65°
12
83°
64°
13
84°
63°
14
87°
64°
15
84°
66°
16
82°
69°
17
84°
68°
18
87°
66°
19
83°
66°
20
82°
65°
21
82°
68°
22
83°
68°
23
83°
65°
24
85°
66°
25
87°
63°
26
88°
60°
27
82°
61°
28
81°
63°
29
81°
64°
30
80°
65°
31
83°
67°
1
85°
61°
2
80°
60°
3
80°
60°
4
81°
59°
5
79°
59°
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 79° to 91°, with overnight lows between 59° and 73°. 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.
