S
M
T
W
T
F
S
30
92°
71°
31
91°
70°
1
85°
71°
2
86°
70°
3
87°
67°
4
87°
67°
5
88°
68°
6
88°
66°
7
89°
66°
8
89°
67°
9
91°
68°
10
91°
69°
11
91°
61°
12
88°
66°
13
91°
62°
14
90°
61°
15
85°
62°
16
90°
65°
17
91°
66°
18
91°
66°
19
90°
65°
20
89°
64°
21
86°
63°
22
83°
62°
23
82°
61°
24
82°
64°
25
80°
63°
26
81°
62°
27
81°
58°
28
83°
57°
29
85°
57°
30
85°
59°
1
86°
61°
2
86°
53°
3
85°
52°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Sylvan
Sylvan's September 2026 forecast shows daily high temperatures ranging from 80° to 92°, with overnight lows between 52° and 71°. The average high for September is 87° 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 Sylvan. See also: October | November | December.
