S
M
T
W
T
F
S
26
57°
45°
27
59°
39°
28
65°
42°
29
59°
38°
30
60°
42°
1
65°
44°
2
61°
40°
3
64°
43°
4
68°
48°
5
71°
50°
6
72°
51°
7
73°
52°
8
73°
53°
9
72°
53°
10
73°
49°
11
63°
46°
12
66°
49°
13
69°
51°
14
65°
47°
15
67°
47°
16
71°
52°
17
75°
54°
18
69°
45°
19
69°
45°
20
67°
44°
21
68°
45°
22
68°
47°
23
69°
48°
24
67°
55°
25
71°
54°
26
75°
53°
27
78°
50°
28
71°
60°
29
73°
58°
30
82°
50°
31
74°
55°
1
73°
55°
2
74°
53°
3
76°
56°
4
79°
54°
5
81°
51°
6
74°
52°
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 57° to 82°, with overnight lows between 38° and 60°. The average high for May is 70° with an average low of 49°. 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.
