S
M
T
W
T
F
S
26
60°
37°
27
53°
37°
28
56°
45°
29
58°
43°
30
57°
41°
1
59°
44°
2
63°
49°
3
59°
50°
4
66°
51°
5
70°
50°
6
70°
48°
7
62°
46°
8
67°
51°
9
70°
52°
10
66°
52°
11
72°
54°
12
72°
53°
13
71°
48°
14
63°
46°
15
66°
47°
16
66°
46°
17
67°
45°
18
69°
49°
19
73°
51°
20
71°
54°
21
69°
50°
22
67°
45°
23
67°
47°
24
68°
47°
25
69°
48°
26
69°
49°
27
71°
52°
28
74°
58°
29
77°
58°
30
76°
59°
31
78°
54°
1
74°
53°
2
71°
51°
3
70°
52°
4
76°
60°
5
78°
61°
6
80°
62°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Mount Prospect
Mount Prospect's May 2026 forecast shows daily high temperatures ranging from 53° to 80°, with overnight lows between 37° and 62°. The average high for May is 68° with an average low of 50°. 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 Mount Prospect. See also: June | July | August.
