S
M
T
W
T
F
S
30
67°
42°
31
77°
50°
1
85°
43°
2
82°
50°
3
73°
49°
4
71°
40°
5
60°
49°
6
63°
51°
7
57°
50°
8
66°
52°
9
76°
51°
10
77°
50°
11
59°
47°
12
58°
41°
13
58°
35°
14
61°
44°
15
52°
47°
16
65°
44°
17
72°
43°
18
70°
37°
19
74°
45°
20
79°
47°
21
82°
50°
22
78°
47°
23
78°
47°
24
73°
47°
25
73°
43°
26
62°
37°
27
64°
41°
28
64°
44°
29
66°
46°
30
68°
46°
1
59°
41°
2
52°
39°
3
65°
41°
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 52° to 82°, with overnight lows between 37° and 50°. The average high for September is 69° with an average low of 44°. 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.
