S
M
T
W
T
F
S
26
82°
65°
27
83°
65°
28
84°
64°
29
84°
64°
30
83°
58°
31
78°
57°
1
76°
59°
2
76°
59°
3
78°
61°
4
81°
62°
5
82°
64°
6
83°
64°
7
80°
63°
8
78°
59°
9
79°
60°
10
80°
57°
11
81°
62°
12
84°
64°
13
85°
63°
14
86°
64°
15
85°
65°
16
87°
64°
17
86°
55°
18
81°
54°
19
78°
54°
20
77°
55°
21
77°
54°
22
78°
54°
23
78°
55°
24
79°
55°
25
81°
56°
26
83°
56°
27
84°
54°
28
78°
54°
29
78°
53°
30
79°
54°
31
79°
57°
1
81°
52°
2
78°
53°
3
77°
59°
4
83°
61°
5
83°
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 76° to 87°, with overnight lows between 52° and 65°. The average high for August is 81° 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.
