Click on a day for an hourly weather forecast
The temperatures in Lethbridge in September are quite cold with temperatures between 9°C and 21°C, warm clothes are a must.
You can expect about 3 to 8 days of rain in Lethbridge during the month of September. It’s a good idea to bring along your umbrella so that you don’t get caught in poor weather.
Please note that Lethbridge can expect a few days of snow in September.
Our weather forecast can give you a great sense of what weather to expect in Lethbridge in September 2025.
If you’re planning to visit Lethbridge in the near future, we highly recommend that you review the 14 day weather forecast for Lethbridge before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | -2° / -9° | 2 | 17 | 12 | 19 mm | Awful | Lethbridge in January |
| February | -2° / -9° | 2 | 12 | 14 | 22 mm | Awful | Lethbridge in February |
| March | 5° / -4° | 4 | 16 | 12 | 30 mm | Awful | Lethbridge in March |
| April | 10° / 1° | 4 | 18 | 9 | 62 mm | Bad | Lethbridge in April |
| May | 16° / 6° | 7 | 23 | 2 | 96 mm | Bad | Lethbridge in May |
| June | 21° / 10° | 9 | 21 | 0 | 137 mm | Ok | Lethbridge in June |
| July | 26° / 12° | 5 | 26 | 0 | 57 mm | Perfect | Lethbridge in July |
| August | 26° / 13° | 4 | 27 | 0 | 55 mm | Perfect | Lethbridge in August |
| September | 21° / 9° | 3 | 27 | 1 | 42 mm | Good | Lethbridge in September |
| October | 12° / 3° | 3 | 22 | 5 | 44 mm | Bad | Lethbridge in October |
| November | 4° / -4° | 2 | 18 | 10 | 29 mm | Awful | Lethbridge in November |
| December | -3° / -9° | 3 | 15 | 14 | 23 mm | Awful | Lethbridge in December |