S
M
T
W
T
F
S
26
89°
68°
27
84°
69°
28
82°
66°
29
80°
63°
30
85°
60°
31
77°
67°
1
71°
65°
2
78°
66°
3
83°
62°
4
85°
65°
5
81°
69°
6
77°
69°
7
85°
67°
8
86°
66°
9
84°
70°
10
88°
68°
11
81°
66°
12
79°
64°
13
80°
63°
14
77°
64°
15
77°
64°
16
80°
63°
17
78°
61°
18
78°
64°
19
82°
63°
20
82°
67°
21
84°
67°
22
85°
68°
23
85°
68°
24
82°
67°
25
82°
67°
26
84°
66°
27
81°
64°
28
78°
66°
29
82°
65°
30
83°
66°
31
83°
66°
1
84°
65°
2
79°
65°
3
81°
64°
4
81°
64°
5
83°
65°
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 77° to 88°, with overnight lows between 61° and 70°. The average high for August is 82° with an average low of 66°. 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.
