S
M
T
W
T
F
S
30
66°
46°
31
66°
54°
1
75°
50°
2
73°
54°
3
64°
54°
4
59°
50°
5
55°
48°
6
N/A
7
66°
49°
8
69°
53°
9
69°
52°
10
58°
45°
11
53°
40°
12
59°
39°
13
64°
45°
14
61°
44°
15
56°
44°
16
58°
39°
17
56°
39°
18
54°
36°
19
54°
38°
20
52°
33°
21
51°
44°
22
52°
43°
23
57°
43°
24
61°
44°
25
63°
44°
26
62°
43°
27
60°
42°
28
52°
41°
29
49°
38°
30
51°
41°
1
50°
38°
2
59°
41°
3
59°
41°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Slave Lake
Slave Lake's September 2026 forecast shows daily high temperatures ranging from 49° to 69°, with overnight lows between 33° and 53°. The average high for September is 58° with an average low of 42°. 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 Slave Lake. See also: October | November | December.
