S
M
T
W
T
F
S
26
84°
60°
27
76°
58°
28
68°
56°
29
83°
62°
30
74°
59°
1
67°
53°
2
69°
46°
3
70°
47°
4
78°
51°
5
80°
59°
6
80°
61°
7
71°
45°
8
71°
48°
9
77°
52°
10
78°
59°
11
79°
58°
12
82°
58°
13
80°
59°
14
81°
57°
15
82°
62°
16
83°
62°
17
83°
61°
18
82°
62°
19
83°
63°
20
83°
63°
21
84°
62°
22
84°
64°
23
83°
64°
24
80°
63°
25
82°
64°
26
82°
65°
27
80°
64°
28
79°
63°
29
82°
64°
30
84°
63°
31
83°
64°
1
85°
65°
2
86°
66°
3
86°
66°
4
87°
65°
5
81°
62°
6
79°
61°
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 67° to 87°, with overnight lows between 45° and 66°. The average high for May is 80° 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.
