S
M
T
W
T
F
S
26
57°
40°
27
68°
46°
28
64°
51°
29
56°
39°
30
54°
36°
1
49°
33°
2
56°
30°
3
69°
46°
4
81°
44°
5
61°
48°
6
57°
38°
7
58°
36°
8
65°
36°
9
74°
45°
10
65°
39°
11
53°
38°
12
69°
37°
13
58°
40°
14
65°
38°
15
76°
61°
16
83°
64°
17
86°
68°
18
80°
70°
19
76°
50°
20
64°
47°
21
66°
50°
22
72°
55°
23
79°
55°
24
73°
58°
25
76°
60°
26
73°
61°
27
73°
61°
28
75°
54°
29
73°
58°
30
68°
55°
31
69°
52°
1
69°
50°
2
68°
50°
3
69°
52°
4
72°
60°
5
80°
62°
6
80°
62°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Arlington Heights
Arlington Heights's May 2026 forecast shows daily high temperatures ranging from 64° to 86°, with overnight lows between 47° and 70°. The average high for May is 74° with an average low of 57°. 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 Arlington Heights. See also: June | July | August.
