S
M
T
W
T
F
S
26
93°
67°
27
92°
68°
28
96°
71°
29
95°
70°
30
92°
71°
31
97°
68°
1
104°
66°
2
91°
70°
3
70°
56°
4
76°
48°
5
89°
53°
6
93°
56°
7
90°
59°
8
97°
62°
9
94°
62°
10
87°
60°
11
93°
62°
12
82°
63°
13
65°
58°
14
74°
58°
15
78°
59°
16
88°
57°
17
87°
61°
18
88°
62°
19
91°
61°
20
93°
59°
21
91°
62°
22
89°
60°
23
95°
63°
24
85°
63°
25
82°
57°
26
91°
56°
27
94°
64°
28
80°
65°
29
82°
62°
30
73°
49°
31
84°
54°
1
82°
55°
2
86°
56°
3
83°
52°
4
79°
48°
5
77°
50°
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 73° to 86°, with overnight lows between 48° and 56°. The average high for August is 81° with an average low of 52°. 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.
