S
M
T
W
T
F
S
26
83°
67°
27
82°
63°
28
82°
63°
29
78°
61°
30
78°
67°
31
79°
65°
1
82°
65°
2
84°
67°
3
84°
68°
4
83°
66°
5
81°
62°
6
78°
61°
7
84°
67°
8
85°
66°
9
82°
67°
10
84°
65°
11
79°
61°
12
83°
66°
13
84°
67°
14
83°
60°
15
76°
59°
16
76°
59°
17
77°
64°
18
76°
66°
19
78°
66°
20
78°
64°
21
80°
65°
22
78°
65°
23
77°
63°
24
83°
57°
25
79°
64°
26
84°
64°
27
83°
63°
28
84°
64°
29
76°
58°
30
75°
57°
31
76°
62°
1
78°
63°
2
73°
64°
3
82°
64°
4
82°
62°
5
79°
57°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Castle Shannon
Castle Shannon's August 2026 forecast shows daily high temperatures ranging from 73° to 85°, with overnight lows between 57° and 68°. The average high for August is 80° with an average low of 63°. 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 Castle Shannon. See also: September | October | November.
