S
M
T
W
T
F
S
30
92°
70°
31
88°
65°
1
86°
59°
2
83°
60°
3
82°
62°
4
83°
63°
5
89°
62°
6
75°
65°
7
93°
70°
8
88°
73°
9
107°
83°
10
100°
77°
11
92°
72°
12
90°
70°
13
88°
67°
14
86°
64°
15
82°
66°
16
80°
66°
17
82°
63°
18
82°
60°
19
88°
65°
20
83°
65°
21
82°
63°
22
85°
64°
23
88°
66°
24
89°
65°
25
90°
63°
26
93°
67°
27
92°
64°
28
87°
62°
29
88°
63°
30
86°
64°
1
85°
59°
2
83°
60°
3
83°
62°
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 82° to 93°, with overnight lows between 59° and 67°. The average high for September is 87° with an average low of 63°. 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.
