S
M
T
W
T
F
S
26
86°
67°
27
88°
69°
28
88°
68°
29
87°
69°
30
89°
70°
31
90°
70°
1
89°
69°
2
87°
67°
3
84°
63°
4
82°
65°
5
82°
63°
6
83°
62°
7
84°
67°
8
86°
66°
9
88°
68°
10
89°
68°
11
88°
67°
12
87°
68°
13
88°
67°
14
89°
66°
15
89°
68°
16
83°
68°
17
84°
67°
18
89°
68°
19
88°
67°
20
87°
61°
21
89°
59°
22
83°
59°
23
83°
61°
24
84°
62°
25
83°
60°
26
83°
65°
27
84°
60°
28
83°
59°
29
82°
59°
30
82°
58°
31
83°
58°
1
81°
59°
2
81°
59°
3
80°
60°
4
79°
59°
5
82°
59°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Plainfield
Plainfield's August 2026 forecast shows daily high temperatures ranging from 79° to 90°, with overnight lows between 58° and 70°. The average high for August is 85° with an average low of 64°. 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 Plainfield. See also: September | October | November.
