S
M
T
W
T
F
S
26
63°
39°
27
67°
48°
28
62°
49°
29
58°
38°
30
57°
35°
1
50°
35°
2
56°
43°
3
63°
44°
4
75°
50°
5
53°
42°
6
53°
37°
7
51°
36°
8
61°
42°
9
63°
43°
10
64°
44°
11
63°
46°
12
65°
47°
13
63°
45°
14
70°
47°
15
63°
45°
16
63°
44°
17
65°
53°
18
72°
53°
19
66°
52°
20
70°
54°
21
73°
54°
22
70°
53°
23
74°
50°
24
66°
48°
25
66°
51°
26
69°
56°
27
73°
54°
28
69°
53°
29
69°
49°
30
71°
48°
31
70°
49°
1
70°
54°
2
79°
54°
3
70°
52°
4
71°
50°
5
71°
50°
6
72°
51°
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 50° to 79°, with overnight lows between 35° and 56°. The average high for May is 66° with an average low of 48°. 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.
