S
M
T
W
T
F
S
26
97°
67°
27
96°
67°
28
96°
65°
29
92°
64°
30
97°
63°
31
101°
64°
1
102°
64°
2
99°
67°
3
97°
65°
4
94°
64°
5
95°
60°
6
98°
63°
7
98°
67°
8
101°
67°
9
N/A
10
99°
64°
11
96°
62°
12
90°
60°
13
88°
59°
14
90°
65°
15
90°
66°
16
91°
65°
17
95°
67°
18
92°
65°
19
94°
66°
20
93°
65°
21
94°
66°
22
96°
67°
23
97°
65°
24
92°
67°
25
94°
68°
26
97°
68°
27
97°
69°
28
96°
69°
29
96°
68°
30
97°
68°
31
95°
67°
1
94°
68°
2
94°
68°
3
92°
66°
4
92°
67°
5
94°
68°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
August Weather in Castaic Junction
Castaic Junction's August 2026 forecast shows daily high temperatures ranging from 88° to 99°, with overnight lows between 59° and 69°. The average high for August is 94° with an average low of 66°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how August weather will actually feel in Castaic Junction. See also: September | October | November.
