S
M
T
W
T
F
S
26
58°
44°
27
71°
39°
28
62°
46°
29
62°
52°
30
69°
43°
1
67°
38°
2
61°
49°
3
63°
42°
4
78°
44°
5
85°
55°
6
73°
54°
7
66°
45°
8
67°
54°
9
71°
49°
10
77°
58°
11
64°
43°
12
63°
46°
13
71°
57°
14
76°
56°
15
78°
57°
16
72°
54°
17
68°
53°
18
72°
54°
19
77°
55°
20
70°
52°
21
69°
51°
22
68°
52°
23
69°
53°
24
70°
52°
25
72°
54°
26
75°
59°
27
74°
56°
28
76°
57°
29
77°
55°
30
79°
61°
31
81°
62°
1
76°
63°
2
81°
61°
3
81°
63°
4
82°
64°
5
82°
63°
6
83°
64°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Wheaton
Wheaton's May 2026 forecast shows daily high temperatures ranging from 63° to 83°, with overnight lows between 43° and 64°. 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 Wheaton. See also: June | July | August.
