S
M
T
W
T
F
S
26
80°
61°
27
80°
61°
28
80°
59°
29
79°
64°
30
81°
65°
31
84°
64°
1
83°
57°
2
81°
58°
3
79°
59°
4
79°
58°
5
78°
57°
6
79°
57°
7
79°
58°
8
80°
59°
9
79°
63°
10
79°
64°
11
80°
64°
12
79°
63°
13
82°
63°
14
84°
58°
15
83°
57°
16
79°
61°
17
80°
59°
18
81°
57°
19
78°
56°
20
77°
55°
21
78°
61°
22
78°
56°
23
77°
60°
24
79°
62°
25
77°
61°
26
81°
63°
27
82°
62°
28
82°
62°
29
83°
61°
30
82°
55°
31
77°
55°
1
76°
54°
2
76°
54°
3
77°
59°
4
75°
54°
5
80°
54°
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 75° to 84°, with overnight lows between 54° and 65°. The average high for August is 80° 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.
