S
M
T
W
T
F
S
26
82°
65°
27
87°
64°
28
83°
67°
29
80°
61°
30
83°
56°
31
84°
60°
1
80°
67°
2
73°
63°
3
79°
60°
4
82°
55°
5
83°
58°
6
84°
62°
7
85°
68°
8
87°
66°
9
88°
67°
10
89°
72°
11
82°
64°
12
69°
64°
13
85°
63°
14
81°
70°
15
83°
69°
16
82°
69°
17
81°
59°
18
82°
64°
19
78°
59°
20
76°
58°
21
77°
56°
22
77°
53°
23
78°
55°
24
76°
57°
25
79°
57°
26
81°
58°
27
80°
59°
28
80°
59°
29
81°
57°
30
78°
56°
31
77°
57°
1
81°
62°
2
80°
60°
3
75°
55°
4
74°
52°
5
75°
55°
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 74° to 82°, with overnight lows between 52° and 69°. The average high for August is 78° with an average low of 58°. 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.
