S
M
T
W
T
F
S
26
83°
62°
27
89°
62°
28
82°
68°
29
80°
64°
30
68°
60°
1
61°
51°
2
72°
43°
3
74°
44°
4
79°
53°
5
80°
62°
6
78°
54°
7
72°
48°
8
73°
50°
9
73°
58°
10
76°
60°
11
81°
61°
12
83°
59°
13
82°
59°
14
83°
58°
15
85°
63°
16
85°
63°
17
84°
62°
18
85°
63°
19
85°
64°
20
86°
64°
21
86°
63°
22
85°
64°
23
81°
64°
24
82°
63°
25
83°
65°
26
80°
65°
27
81°
64°
28
82°
61°
29
86°
64°
30
87°
65°
31
86°
64°
1
86°
64°
2
88°
66°
3
89°
67°
4
89°
67°
5
84°
63°
6
84°
64°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Decatur
Decatur's May 2026 forecast shows daily high temperatures ranging from 61° to 89°, with overnight lows between 43° and 67°. The average high for May is 82° with an average low of 60°. 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 Decatur. See also: June | July | August.
