S
M
T
W
T
F
S
26
89°
65°
27
88°
68°
28
89°
66°
29
86°
66°
30
87°
65°
31
89°
67°
1
94°
67°
2
91°
67°
3
90°
66°
4
87°
65°
5
87°
66°
6
87°
67°
7
90°
66°
8
91°
65°
9
92°
66°
10
90°
65°
11
87°
65°
12
87°
66°
13
88°
65°
14
90°
64°
15
89°
62°
16
89°
64°
17
86°
62°
18
87°
64°
19
89°
65°
20
90°
64°
21
90°
64°
22
91°
65°
23
92°
66°
24
92°
66°
25
91°
65°
26
91°
65°
27
90°
66°
28
91°
66°
29
90°
65°
30
91°
66°
31
91°
66°
1
90°
65°
2
91°
65°
3
89°
64°
4
88°
66°
5
87°
65°
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 86° to 92°, with overnight lows between 62° and 67°. The average high for August is 89° with an average low of 65°. 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.
