S
M
T
W
T
F
S
30
81°
67°
31
82°
70°
1
87°
71°
2
90°
66°
3
84°
63°
4
76°
61°
5
78°
61°
6
78°
63°
7
82°
64°
8
82°
63°
9
75°
57°
10
74°
58°
11
75°
55°
12
78°
60°
13
78°
59°
14
76°
59°
15
77°
60°
16
77°
59°
17
76°
58°
18
71°
57°
19
76°
59°
20
77°
59°
21
77°
58°
22
76°
58°
23
77°
57°
24
76°
57°
25
75°
56°
26
74°
55°
27
75°
56°
28
75°
55°
29
73°
54°
30
71°
54°
1
71°
53°
2
72°
54°
3
73°
53°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Sylvan Lake
Sylvan Lake's September 2026 forecast shows daily high temperatures ranging from 71° to 90°, with overnight lows between 53° and 71°. The average high for September is 77° with an average low of 59°. 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 Lake. See also: October | November | December.
