S
M
T
W
T
F
S
26
81°
58°
27
85°
61°
28
82°
68°
29
78°
60°
30
81°
54°
31
86°
53°
1
80°
64°
2
80°
68°
3
79°
56°
4
86°
52°
5
88°
63°
6
86°
69°
7
84°
68°
8
84°
68°
9
84°
65°
10
80°
67°
11
75°
66°
12
77°
65°
13
79°
64°
14
83°
64°
15
83°
60°
16
84°
70°
17
81°
63°
18
81°
59°
19
81°
60°
20
77°
61°
21
81°
57°
22
83°
56°
23
74°
56°
24
72°
54°
25
78°
59°
26
81°
54°
27
82°
62°
28
78°
53°
29
82°
49°
30
75°
58°
31
86°
65°
1
89°
71°
2
92°
70°
3
87°
68°
4
79°
66°
5
80°
57°
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 ° to °, with overnight lows between ° and °. The average high for August is ° with an average low of °. 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.
