S
M
T
W
T
F
S
26
88°
65°
27
90°
65°
28
88°
64°
29
84°
65°
30
81°
64°
31
82°
61°
1
80°
63°
2
81°
63°
3
81°
62°
4
82°
63°
5
82°
61°
6
81°
58°
7
81°
58°
8
82°
61°
9
83°
63°
10
82°
63°
11
84°
62°
12
84°
63°
13
85°
63°
14
85°
62°
15
82°
59°
16
80°
56°
17
80°
58°
18
81°
57°
19
82°
61°
20
86°
61°
21
82°
54°
22
78°
53°
23
78°
55°
24
81°
54°
25
80°
56°
26
85°
61°
27
86°
62°
28
87°
62°
29
90°
61°
30
88°
54°
31
80°
56°
1
80°
61°
2
81°
59°
3
84°
54°
4
85°
61°
5
87°
55°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in New Castle Northwest
New Castle Northwest's August 2026 forecast shows daily high temperatures ranging from 78° to 90°, with overnight lows between 53° and 65°. The average high for August is 83° with an average low of 60°. 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 Northwest. See also: September | October | November.
