S
M
T
W
T
F
S
26
86°
71°
27
87°
70°
28
86°
72°
29
87°
70°
30
86°
71°
31
85°
70°
1
79°
67°
2
78°
66°
3
79°
70°
4
81°
70°
5
82°
69°
6
85°
70°
7
86°
70°
8
86°
69°
9
85°
70°
10
85°
70°
11
84°
69°
12
86°
70°
13
85°
71°
14
86°
62°
15
85°
63°
16
81°
66°
17
80°
65°
18
84°
64°
19
85°
61°
20
78°
59°
21
77°
59°
22
77°
60°
23
78°
60°
24
77°
61°
25
78°
65°
26
77°
62°
27
84°
61°
28
83°
59°
29
76°
59°
30
75°
60°
31
75°
58°
1
76°
58°
2
74°
57°
3
75°
57°
4
75°
58°
5
76°
61°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in River Forest
River Forest's August 2026 forecast shows daily high temperatures ranging from 74° to 87°, with overnight lows between 57° and 72°. The average high for August is 81° 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 River Forest. See also: September | October | November.
