Click on a day for an hourly weather forecast
The temperatures in Penticton in September are quite cold with temperatures between 5°C and 19°C, warm clothes are a must.
You can expect about 3 to 8 days of rain in Penticton 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.
Our weather forecast can give you a great sense of what weather to expect in Penticton in September 2025.
If you’re planning to visit Penticton in the near future, we highly recommend that you review the 14 day weather forecast for Penticton before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | -2° / -11° | 9 | 9 | 15 | 37 mm | Awful | Penticton in January |
| February | -1° / -12° | 9 | 8 | 14 | 39 mm | Awful | Penticton in February |
| March | 3° / -7° | 8 | 15 | 8 | 43 mm | Awful | Penticton in March |
| April | 9° / -3° | 5 | 23 | 3 | 34 mm | Bad | Penticton in April |
| May | 16° / 2° | 7 | 24 | 0 | 42 mm | Good | Penticton in May |
| June | 20° / 5° | 6 | 24 | 0 | 39 mm | Good | Penticton in June |
| July | 26° / 8° | 3 | 28 | 0 | 20 mm | Perfect | Penticton in July |
| August | 25° / 8° | 2 | 29 | 0 | 16 mm | Perfect | Penticton in August |
| September | 19° / 5° | 3 | 27 | 0 | 24 mm | Good | Penticton in September |
| October | 10° / 0° | 4 | 27 | 1 | 37 mm | Ok | Penticton in October |
| November | 2° / -6° | 7 | 15 | 8 | 42 mm | Awful | Penticton in November |
| December | -3° / -12° | 8 | 8 | 16 | 35 mm | Awful | Penticton in December |