S
M
T
W
T
F
S
26
76°
52°
27
68°
56°
28
70°
57°
29
70°
58°
30
72°
59°
1
80°
60°
2
81°
59°
3
80°
59°
4
72°
51°
5
71°
49°
6
72°
55°
7
75°
60°
8
82°
59°
9
82°
60°
10
77°
61°
11
80°
62°
12
83°
63°
13
83°
64°
14
82°
62°
15
76°
56°
16
76°
63°
17
78°
64°
18
76°
65°
19
77°
64°
20
77°
60°
21
78°
58°
22
81°
60°
23
82°
62°
24
82°
63°
25
84°
63°
26
84°
64°
27
85°
65°
28
86°
63°
29
88°
67°
30
89°
64°
31
89°
67°
1
88°
62°
2
82°
61°
3
81°
60°
4
79°
62°
5
80°
69°
6
89°
69°
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 68° to 89°, with overnight lows between 49° and 69°. The average high for May is 80° with an average low of 61°. 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.
