S
M
T
W
T
F
S
26
85°
69°
27
90°
72°
28
91°
69°
29
85°
70°
30
86°
72°
31
88°
71°
1
90°
71°
2
84°
75°
3
89°
75°
4
88°
73°
5
89°
75°
6
91°
75°
7
92°
74°
8
93°
74°
9
94°
76°
10
93°
71°
11
89°
71°
12
87°
74°
13
90°
76°
14
85°
79°
15
89°
74°
16
85°
75°
17
89°
71°
18
89°
68°
19
90°
69°
20
86°
65°
21
81°
65°
22
78°
63°
23
87°
66°
24
86°
65°
25
86°
67°
26
85°
66°
27
84°
65°
28
82°
63°
29
81°
65°
30
86°
68°
31
87°
68°
1
87°
67°
2
86°
68°
3
87°
68°
4
87°
67°
5
84°
67°
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 90°, with overnight lows between 63° and 75°. The average high for August is 86° 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.
