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
76°
61°
16
82°
63°
17
85°
66°
18
80°
68°
19
74°
50°
20
65°
45°
21
63°
48°
22
72°
50°
23
78°
53°
24
75°
57°
25
76°
57°
26
74°
58°
27
75°
59°
28
76°
52°
29
74°
56°
30
70°
53°
31
70°
51°
1
71°
48°
2
69°
48°
3
70°
51°
4
73°
59°
5
81°
60°
6
81°
61°
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 85°, with overnight lows between 45° and 68°. The average high for May is 74° with an average low of 55°. 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.
