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
70°
46°
23
79°
48°
24
73°
46°
25
64°
53°
26
63°
51°
27
64°
49°
28
75°
42°
29
78°
46°
30
79°
52°
1
85°
53°
2
84°
51°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
April Weather in Castaic Junction
Castaic Junction's April 2026 forecast shows daily high temperatures ranging from 79° to 85°, with overnight lows between 51° and 53°. The average high for April is 83° with an average low of 52°. 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 Junction. See also: May | June | July.
