S
M
T
W
T
F
S
26
86°
66°
27
88°
73°
28
82°
68°
29
68°
60°
30
67°
55°
1
67°
54°
2
75°
46°
3
82°
48°
4
80°
57°
5
82°
63°
6
64°
55°
7
71°
49°
8
76°
53°
9
84°
63°
10
74°
63°
11
78°
55°
12
80°
49°
13
88°
52°
14
84°
64°
15
88°
61°
16
88°
71°
17
87°
72°
18
88°
76°
19
80°
65°
20
82°
62°
21
75°
67°
22
82°
68°
23
80°
66°
24
84°
66°
25
85°
65°
26
85°
66°
27
81°
66°
28
84°
70°
29
89°
71°
30
92°
74°
31
95°
72°
1
97°
71°
2
92°
69°
3
88°
66°
4
85°
69°
5
86°
69°
6
88°
68°
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 85° to 97°, with overnight lows between 66° and 74°. The average high for May is 90° with an average low of 70°. 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.
