S
M
T
W
T
F
S
26
58°
43°
27
70°
39°
28
57°
47°
29
57°
51°
30
65°
43°
1
63°
37°
2
57°
43°
3
61°
40°
4
74°
38°
5
82°
54°
6
72°
55°
7
66°
50°
8
68°
40°
9
62°
49°
10
68°
49°
11
63°
45°
12
68°
38°
13
71°
52°
14
58°
49°
15
71°
49°
16
81°
48°
17
86°
59°
18
97°
64°
19
96°
70°
20
85°
55°
21
68°
50°
22
62°
51°
23
58°
51°
24
67°
55°
25
74°
56°
26
77°
55°
27
75°
55°
28
77°
56°
29
77°
55°
30
79°
55°
31
82°
53°
1
78°
57°
2
75°
58°
3
72°
58°
4
76°
57°
5
74°
54°
6
75°
58°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Duncannon
Duncannon's May 2026 forecast shows daily high temperatures ranging from 58° to 97°, with overnight lows between 50° and 70°. The average high for May is 76° with an average low of 56°. 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 Duncannon. See also: June | July | August.
