S
M
T
W
T
F
S
29
58°
33°
30
68°
55°
31
76°
56°
1
66°
42°
2
54°
44°
3
74°
47°
4
79°
49°
5
49°
32°
6
48°
31°
7
40°
15°
8
51°
23°
9
62°
39°
10
75°
42°
11
59°
32°
12
69°
42°
13
77°
57°
14
78°
55°
15
80°
57°
16
82°
55°
17
72°
55°
18
78°
39°
19
48°
32°
20
41°
20°
21
59°
29°
22
72°
45°
23
76°
47°
24
74°
51°
25
51°
39°
26
55°
38°
27
N/A
28
57°
48°
29
56°
41°
30
55°
33°
1
52°
32°
2
45°
32°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
April Weather in New Castle
New Castle's April 2026 forecast shows daily high temperatures ranging from 45° to 57°, with overnight lows between 32° and 48°. The average high for April is 53° with an average low of 37°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how April weather will actually feel in New Castle. See also: May | June | July.
