S
M
T
W
T
F
S
30
76°
52°
31
72°
48°
1
68°
50°
2
67°
49°
3
67°
48°
4
68°
49°
5
67°
48°
6
67°
49°
7
69°
54°
8
71°
54°
9
66°
48°
10
67°
49°
11
69°
51°
12
68°
49°
13
67°
51°
14
69°
50°
15
66°
47°
16
65°
46°
17
63°
45°
18
64°
48°
19
71°
51°
20
Hist. Avg.
67°
48°
21
Hist. Avg.
67°
48°
22
Hist. Avg.
66°
47°
23
Hist. Avg.
66°
47°
24
Hist. Avg.
66°
47°
25
Hist. Avg.
65°
46°
26
Hist. Avg.
65°
46°
27
Hist. Avg.
65°
46°
28
Hist. Avg.
64°
45°
29
Hist. Avg.
64°
45°
30
Hist. Avg.
63°
45°
1
Hist. Avg.
63°
44°
2
Hist. Avg.
63°
44°
3
Hist. Avg.
62°
44°
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 63° to 76°, with overnight lows between 45° and 54°. The average high for September is 68° with an average low of 49°. 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.
