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
59°
42°
8
63°
49°
9
73°
50°
10
60°
41°
11
57°
44°
12
57°
45°
13
66°
51°
14
68°
54°
15
73°
52°
16
66°
50°
17
65°
51°
18
69°
52°
19
70°
50°
20
65°
46°
21
64°
47°
22
63°
47°
23
65°
49°
24
66°
50°
25
67°
49°
26
67°
48°
27
68°
49°
28
69°
50°
29
72°
56°
30
77°
57°
31
78°
59°
1
78°
56°
2
71°
57°
3
78°
60°
4
79°
61°
5
80°
60°
6
71°
60°
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 57° to 80°, with overnight lows between 38° and 61°. The average high for May is 68° with an average low of 51°. 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.
