S
M
T
W
T
F
S
26
88°
65°
27
88°
65°
28
87°
64°
29
84°
60°
30
82°
57°
31
80°
57°
1
79°
58°
2
80°
57°
3
83°
63°
4
82°
61°
5
82°
63°
6
83°
64°
7
85°
63°
8
81°
61°
9
82°
60°
10
83°
57°
11
84°
60°
12
87°
62°
13
88°
63°
14
89°
64°
15
88°
63°
16
88°
64°
17
90°
61°
18
84°
55°
19
81°
54°
20
79°
53°
21
80°
54°
22
81°
54°
23
81°
55°
24
84°
55°
25
86°
56°
26
87°
61°
27
88°
57°
28
86°
54°
29
79°
54°
30
80°
55°
31
83°
58°
1
86°
53°
2
80°
52°
3
79°
54°
4
83°
59°
5
84°
60°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in New Castle
New Castle's August 2026 forecast shows daily high temperatures ranging from 79° to 90°, with overnight lows between 52° and 65°. The average high for August is 84° with an average low of 59°. 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 New Castle. See also: September | October | November.
