S
M
T
W
T
F
S
28
83°
65°
29
89°
64°
30
92°
69°
1
95°
75°
2
94°
73°
3
95°
70°
4
89°
68°
5
84°
67°
6
85°
69°
7
86°
68°
8
85°
65°
9
86°
64°
10
83°
67°
11
86°
61°
12
87°
64°
13
89°
67°
14
92°
68°
15
95°
67°
16
91°
68°
17
89°
66°
18
84°
65°
19
84°
62°
20
82°
64°
21
84°
62°
22
86°
62°
23
85°
61°
24
89°
65°
25
89°
64°
26
88°
65°
27
90°
65°
28
88°
64°
29
84°
65°
30
81°
64°
31
82°
61°
1
80°
63°
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 80° to 95°, with overnight lows between 61° and 68°. The average high for July is 86° with an average low of 64°. 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.
