S
M
T
W
T
F
S
30
76°
57°
31
77°
56°
1
76°
57°
2
75°
55°
3
75°
54°
4
76°
56°
5
78°
60°
6
75°
59°
7
74°
56°
8
79°
53°
9
74°
58°
10
77°
62°
11
80°
60°
12
81°
60°
13
80°
52°
14
75°
58°
15
73°
51°
16
72°
51°
17
70°
58°
18
76°
54°
19
74°
56°
20
72°
49°
21
77°
48°
22
69°
46°
23
76°
56°
24
78°
48°
25
Hist. Avg.
72°
50°
26
Hist. Avg.
72°
50°
27
Hist. Avg.
71°
50°
28
Hist. Avg.
71°
49°
29
Hist. Avg.
70°
49°
30
Hist. Avg.
70°
48°
1
Hist. Avg.
69°
48°
2
Hist. Avg.
69°
47°
3
Hist. Avg.
68°
47°
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 69° to 81°, with overnight lows between 46° and 62°. The average high for September is 76° with an average low of 55°. 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.
