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
N/A
4
77°
50°
5
58°
41°
6
54°
42°
7
57°
41°
8
56°
43°
9
64°
49°
10
63°
47°
11
61°
46°
12
66°
48°
13
67°
48°
14
66°
50°
15
69°
50°
16
70°
49°
17
72°
52°
18
65°
52°
19
71°
55°
20
70°
55°
21
68°
46°
22
65°
45°
23
65°
47°
24
66°
47°
25
66°
48°
26
67°
48°
27
66°
49°
28
67°
48°
29
68°
54°
30
69°
59°
31
75°
54°
1
70°
55°
2
74°
59°
3
76°
60°
4
78°
60°
5
78°
61°
6
80°
62°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
May Weather in Prospect Heights
Prospect Heights's May 2026 forecast shows daily high temperatures ranging from 54° to 80°, with overnight lows between 41° and 62°. 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 Prospect Heights. See also: June | July | August.
