S
M
T
W
T
F
S
30
94°
68°
31
94°
68°
1
93°
67°
2
94°
67°
3
91°
66°
4
90°
67°
5
89°
67°
6
90°
66°
7
92°
67°
8
93°
67°
9
93°
68°
10
92°
68°
11
93°
67°
12
92°
66°
13
91°
67°
14
86°
66°
15
87°
63°
16
89°
66°
17
91°
65°
18
92°
63°
19
91°
62°
20
90°
62°
21
90°
61°
22
88°
60°
23
87°
61°
24
89°
64°
25
90°
65°
26
90°
66°
27
91°
65°
28
92°
64°
29
90°
62°
30
89°
57°
1
86°
59°
2
81°
57°
3
79°
54°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Sylmar
Sylmar's September 2026 forecast shows daily high temperatures ranging from 79° to 94°, with overnight lows between 54° and 68°. The average high for September is 90° with an average low of 64°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how September weather will actually feel in Sylmar. See also: October | November | December.
