S
M
T
W
T
F
S
26
88°
68°
27
88°
67°
28
87°
67°
29
84°
66°
30
80°
66°
31
81°
65°
1
80°
66°
2
80°
63°
3
81°
65°
4
82°
62°
5
81°
61°
6
80°
60°
7
80°
60°
8
81°
65°
9
80°
66°
10
81°
65°
11
81°
64°
12
82°
63°
13
82°
64°
14
83°
65°
15
84°
65°
16
80°
64°
17
80°
62°
18
81°
61°
19
81°
60°
20
84°
64°
21
80°
56°
22
78°
55°
23
78°
57°
24
80°
56°
25
79°
57°
26
84°
60°
27
86°
62°
28
88°
64°
29
88°
62°
30
87°
56°
31
79°
60°
1
79°
63°
2
82°
55°
3
84°
61°
4
84°
63°
5
86°
59°
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 78° to 88°, with overnight lows between 55° and 68°. The average high for August is 82° with an average low of 62°. 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.
