S
M
T
W
T
F
S
26
84°
61°
27
89°
62°
28
81°
68°
29
80°
63°
30
68°
58°
1
59°
54°
2
72°
48°
3
75°
43°
4
81°
46°
5
80°
53°
6
77°
65°
7
71°
58°
8
67°
56°
9
72°
62°
10
82°
65°
11
76°
63°
12
82°
60°
13
83°
59°
14
80°
54°
15
85°
50°
16
84°
61°
17
87°
64°
18
86°
69°
19
90°
69°
20
84°
68°
21
84°
67°
22
85°
64°
23
79°
65°
24
82°
64°
25
84°
63°
26
83°
66°
27
83°
64°
28
84°
63°
29
80°
64°
30
87°
62°
31
88°
66°
1
88°
66°
2
89°
65°
3
84°
66°
4
83°
63°
5
84°
64°
6
87°
67°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in De Kalb
De Kalb's May 2026 forecast shows daily high temperatures ranging from 79° to 90°, with overnight lows between 62° and 69°. The average high for May is 85° with an average low of 65°. 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 De Kalb. See also: June | July | August.
