S
M
T
W
T
F
S
28
80°
64°
29
88°
70°
30
95°
74°
1
98°
74°
2
97°
73°
3
96°
71°
4
93°
69°
5
91°
68°
6
90°
66°
7
87°
66°
8
88°
65°
9
90°
66°
10
86°
65°
11
87°
60°
12
85°
63°
13
82°
57°
14
80°
57°
15
80°
58°
16
81°
57°
17
82°
59°
18
82°
62°
19
83°
64°
20
86°
64°
21
86°
63°
22
84°
64°
23
82°
64°
24
85°
63°
25
87°
64°
26
88°
65°
27
88°
65°
28
87°
64°
29
84°
60°
30
82°
57°
31
80°
57°
1
79°
58°
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 98°, with overnight lows between 57° and 74°. 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.
