S
M
T
W
T
F
S
30
84°
69°
31
82°
73°
1
87°
71°
2
90°
66°
3
84°
63°
4
83°
65°
5
78°
61°
6
78°
63°
7
80°
64°
8
82°
63°
9
81°
64°
10
79°
55°
11
75°
60°
12
78°
60°
13
78°
59°
14
77°
60°
15
79°
59°
16
76°
58°
17
74°
59°
18
78°
59°
19
74°
58°
20
75°
58°
21
76°
59°
22
76°
59°
23
76°
57°
24
70°
55°
25
65°
54°
26
67°
55°
27
71°
55°
28
73°
54°
29
73°
55°
30
72°
55°
1
73°
56°
2
73°
55°
3
70°
55°
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 65° to 90°, with overnight lows between 54° and 73°. The average high for September is 77° with an average low of 60°. 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.
