S
M
T
W
T
F
S
26
84°
67°
27
90°
74°
28
85°
64°
29
64°
57°
30
63°
54°
1
64°
56°
2
74°
51°
3
81°
56°
4
83°
60°
5
85°
56°
6
67°
49°
7
73°
47°
8
77°
60°
9
88°
63°
10
77°
59°
11
76°
54°
12
82°
61°
13
90°
63°
14
90°
64°
15
89°
69°
16
88°
71°
17
87°
75°
18
87°
72°
19
74°
62°
20
78°
64°
21
78°
66°
22
82°
69°
23
84°
66°
24
82°
67°
25
85°
68°
26
86°
70°
27
87°
69°
28
86°
66°
29
86°
70°
30
85°
71°
31
83°
71°
1
82°
70°
2
84°
71°
3
87°
72°
4
87°
72°
5
84°
71°
6
83°
72°
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 74° to 89°, with overnight lows between 62° and 75°. The average high for May is 84° with an average low of 69°. 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.
