S
M
T
W
T
F
S
26
80°
63°
27
82°
60°
28
81°
59°
29
81°
61°
30
83°
65°
31
87°
63°
1
84°
59°
2
81°
59°
3
81°
60°
4
82°
58°
5
81°
58°
6
81°
59°
7
82°
58°
8
81°
59°
9
80°
64°
10
80°
65°
11
81°
65°
12
81°
61°
13
84°
64°
14
86°
58°
15
83°
57°
16
80°
61°
17
83°
63°
18
85°
58°
19
80°
57°
20
79°
56°
21
78°
61°
22
80°
57°
23
79°
63°
24
78°
62°
25
79°
62°
26
81°
63°
27
83°
63°
28
84°
62°
29
84°
62°
30
83°
55°
31
77°
56°
1
77°
55°
2
76°
55°
3
77°
61°
4
77°
54°
5
81°
55°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Duncannon
Duncannon's August 2026 forecast shows daily high temperatures ranging from 76° to 87°, with overnight lows between 54° and 65°. The average high for August is 81° 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 August weather will actually feel in Duncannon. See also: September | October | November.
