S
M
T
W
T
F
S
30
82°
63°
31
80°
68°
1
89°
67°
2
73°
67°
3
89°
71°
4
88°
69°
5
83°
63°
6
80°
55°
7
N/A
8
83°
63°
9
88°
70°
10
84°
64°
11
81°
57°
12
83°
63°
13
87°
66°
14
85°
65°
15
84°
64°
16
83°
58°
17
81°
61°
18
80°
61°
19
80°
60°
20
78°
56°
21
79°
60°
22
72°
60°
23
72°
59°
24
73°
59°
25
74°
56°
26
77°
55°
27
73°
52°
28
73°
56°
29
77°
58°
30
78°
58°
1
77°
57°
2
76°
58°
3
76°
54°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Plainfield
Plainfield's September 2026 forecast shows daily high temperatures ranging from 72° to 88°, with overnight lows between 52° and 70°. The average high for September is 79° with an average low of 60°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how September weather will actually feel in Plainfield. See also: October | November | December.
