S
M
T
W
T
F
S
28
82°
69°
29
87°
69°
30
91°
73°
1
100°
72°
2
100°
69°
3
100°
72°
4
99°
73°
5
97°
70°
6
94°
68°
7
89°
71°
8
86°
69°
9
90°
72°
10
86°
70°
11
86°
70°
12
76°
70°
13
79°
59°
14
90°
61°
15
98°
70°
16
99°
71°
17
97°
69°
18
93°
67°
19
90°
66°
20
89°
67°
21
84°
63°
22
83°
65°
23
82°
63°
24
83°
64°
25
85°
64°
26
87°
63°
27
87°
65°
28
88°
66°
29
88°
62°
30
83°
65°
31
82°
66°
1
85°
65°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
July Weather in New Castle
New Castle's July 2026 forecast shows daily high temperatures ranging from 79° to 99°, with overnight lows between 59° and 71°. The average high for July is 88° with an average low of 65°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how July weather will actually feel in New Castle. See also: August | September | October.
