S
M
T
W
T
F
S
26
65°
44°
27
66°
51°
28
62°
49°
29
58°
38°
30
59°
35°
1
50°
34°
2
56°
30°
3
67°
42°
4
79°
45°
5
56°
44°
6
57°
37°
7
60°
33°
8
66°
44°
9
74°
47°
10
64°
42°
11
59°
42°
12
75°
40°
13
63°
41°
14
68°
39°
15
76°
61°
16
82°
62°
17
85°
65°
18
79°
66°
19
76°
49°
20
65°
46°
21
64°
49°
22
71°
52°
23
78°
57°
24
77°
58°
25
76°
60°
26
74°
59°
27
74°
60°
28
76°
54°
29
74°
58°
30
69°
55°
31
69°
52°
1
70°
50°
2
69°
50°
3
70°
52°
4
73°
60°
5
80°
62°
6
81°
62°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Plainfield
Plainfield's May 2026 forecast shows daily high temperatures ranging from 64° to 85°, with overnight lows between 46° and 66°. The average high for May is 74° with an average low of 56°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how May weather will actually feel in Plainfield. See also: June | July | August.
