S
M
T
W
T
F
S
26
63°
39°
27
67°
48°
28
62°
49°
29
58°
38°
30
57°
35°
1
52°
34°
2
57°
29°
3
68°
43°
4
80°
43°
5
58°
45°
6
58°
37°
7
61°
32°
8
67°
35°
9
74°
43°
10
65°
37°
11
58°
40°
12
70°
38°
13
63°
42°
14
68°
36°
15
74°
51°
16
83°
59°
17
86°
64°
18
78°
65°
19
78°
51°
20
59°
46°
21
63°
53°
22
64°
54°
23
72°
57°
24
77°
56°
25
76°
56°
26
77°
58°
27
78°
57°
28
81°
59°
29
80°
59°
30
79°
61°
31
81°
60°
1
77°
54°
2
79°
58°
3
72°
54°
4
71°
52°
5
73°
59°
6
79°
61°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Naperville
Naperville's May 2026 forecast shows daily high temperatures ranging from 59° to 81°, with overnight lows between 46° and 61°. The average high for May is 75° 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 Naperville. See also: June | July | August.
