S
M
T
W
T
F
S
26
85°
68°
27
79°
65°
28
79°
63°
29
80°
64°
30
84°
69°
31
85°
68°
1
82°
65°
2
84°
68°
3
86°
61°
4
79°
61°
5
79°
64°
6
80°
61°
7
79°
60°
8
80°
59°
9
79°
59°
10
79°
67°
11
81°
64°
12
81°
64°
13
85°
59°
14
78°
59°
15
81°
61°
16
80°
60°
17
77°
60°
18
78°
59°
19
78°
59°
20
80°
61°
21
82°
66°
22
82°
67°
23
85°
68°
24
86°
67°
25
86°
63°
26
85°
60°
27
81°
64°
28
84°
66°
29
81°
58°
30
82°
57°
31
78°
55°
1
76°
58°
2
75°
57°
3
77°
57°
4
76°
56°
5
75°
56°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Joliet
Joliet's August 2026 forecast shows daily high temperatures ranging from 75° to 86°, with overnight lows between 55° and 69°. The average high for August is 81° with an average low of 62°. 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 Joliet. See also: September | October | November.
