S
M
T
W
T
F
S
26
89°
65°
27
91°
64°
28
91°
64°
29
87°
62°
30
89°
63°
31
91°
65°
1
90°
64°
2
89°
65°
3
91°
65°
4
91°
66°
5
92°
66°
6
91°
65°
7
91°
65°
8
90°
64°
9
92°
64°
10
91°
63°
11
86°
64°
12
88°
63°
13
88°
61°
14
86°
62°
15
86°
64°
16
88°
64°
17
91°
62°
18
91°
64°
19
90°
63°
20
92°
65°
21
89°
64°
22
86°
65°
23
89°
64°
24
88°
64°
25
87°
61°
26
86°
59°
27
85°
59°
28
86°
64°
29
87°
64°
30
87°
63°
31
89°
63°
1
88°
62°
2
88°
61°
3
89°
60°
4
87°
58°
5
87°
58°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Lake Forest
Lake Forest's August 2026 forecast shows daily high temperatures ranging from 85° to 92°, with overnight lows between 58° and 66°. The average high for August is 89° with an average low of 63°. 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 Lake Forest. See also: September | October | November.
