S
M
T
W
T
F
S
27
88°
56°
28
83°
55°
29
82°
58°
30
82°
62°
1
86°
61°
2
87°
62°
3
87°
63°
4
88°
65°
5
89°
64°
6
90°
63°
7
89°
61°
8
88°
60°
9
86°
61°
10
87°
60°
11
86°
60°
12
86°
59°
13
85°
60°
14
81°
55°
15
78°
54°
16
77°
55°
17
78°
59°
18
79°
55°
19
77°
52°
20
76°
51°
21
75°
52°
22
74°
55°
23
77°
56°
24
77°
52°
25
75°
55°
26
76°
54°
27
75°
54°
28
75°
55°
29
76°
52°
30
74°
56°
31
75°
55°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
October Weather in Castaic Junction
Castaic Junction's October 2026 forecast shows daily high temperatures ranging from 74° to 90°, with overnight lows between 51° and 65°. The average high for October is 81° with an average low of 57°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how October weather will actually feel in Castaic Junction. See also: November | December | January.
