S
M
T
W
T
F
S
29
88°
50°
30
78°
48°
31
67°
56°
1
69°
54°
2
70°
53°
3
75°
47°
4
83°
55°
5
84°
54°
6
82°
55°
7
82°
48°
8
83°
53°
9
78°
53°
10
71°
53°
11
68°
52°
12
64°
51°
13
63°
49°
14
73°
44°
15
74°
45°
16
76°
49°
17
76°
46°
18
82°
45°
19
78°
50°
20
76°
45°
21
63°
45°
22
72°
48°
23
78°
46°
24
74°
51°
25
66°
51°
26
69°
50°
27
72°
50°
28
75°
54°
29
76°
53°
30
82°
55°
1
83°
56°
2
82°
56°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
April Weather in Castaic
Castaic's April 2026 forecast shows daily high temperatures ranging from 63° to 83°, with overnight lows between 45° and 56°. The average high for April is 74° with an average low of 51°. 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 Castaic. See also: May | June | July.
