S
M
T
W
T
F
S
30
77°
54°
31
68°
53°
1
68°
53°
2
66°
52°
3
66°
49°
4
65°
49°
5
66°
48°
6
63°
49°
7
64°
37°
8
63°
39°
9
63°
39°
10
65°
38°
11
62°
42°
12
67°
40°
13
62°
41°
14
68°
42°
15
72°
46°
16
73°
50°
17
74°
48°
18
73°
50°
19
74°
49°
20
74°
50°
21
73°
49°
22
74°
50°
23
72°
45°
24
68°
39°
25
63°
40°
26
62°
41°
27
62°
43°
28
67°
39°
29
63°
45°
30
67°
42°
1
66°
44°
2
65°
45°
3
70°
40°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Lethbridge
Lethbridge's September 2026 forecast shows daily high temperatures ranging from 62° to 77°, with overnight lows between 37° and 54°. The average high for September is 68° with an average low of 45°. 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 Lethbridge. See also: October | November | December.
