S
M
T
W
T
F
S
26
62°
35°
27
66°
43°
28
62°
47°
29
50°
36°
30
48°
31°
1
46°
29°
2
45°
34°
3
50°
42°
4
62°
46°
5
48°
37°
6
45°
35°
7
45°
35°
8
46°
36°
9
47°
37°
10
50°
38°
11
54°
40°
12
51°
39°
13
53°
40°
14
52°
43°
15
54°
41°
16
63°
46°
17
64°
45°
18
63°
42°
19
59°
42°
20
60°
45°
21
62°
42°
22
57°
39°
23
55°
38°
24
57°
38°
25
56°
39°
26
58°
39°
27
58°
40°
28
59°
39°
29
58°
40°
30
59°
44°
31
61°
46°
1
61°
44°
2
62°
43°
3
66°
48°
4
63°
46°
5
63°
51°
6
70°
52°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Duncan
Duncan's May 2026 forecast shows daily high temperatures ranging from 45° to 70°, with overnight lows between 34° and 52°. The average high for May is 57° with an average low of 41°. 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 Duncan. See also: June | July | August.
