Click on a day for an hourly weather forecast
The temperatures in Knysna in September are usually low and can range between 14°C and 19°C.
You can expect about 3 to 8 days of rain in Knysna 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 Knysna in September 2025.
If you’re planning to visit Knysna in the near future, we highly recommend that you review the 14 day weather forecast for Knysna before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 24° / 19° | 3 | 29 | 0 | 41 mm | Perfect | Knysna in January |
| February | 24° / 19° | 2 | 26 | 0 | 36 mm | Perfect | Knysna in February |
| March | 24° / 18° | 2 | 29 | 0 | 44 mm | Perfect | Knysna in March |
| April | 22° / 16° | 3 | 27 | 0 | 51 mm | Good | Knysna in April |
| May | 21° / 15° | 3 | 28 | 0 | 52 mm | Good | Knysna in May |
| June | 19° / 14° | 4 | 26 | 0 | 75 mm | Good | Knysna in June |
| July | 18° / 13° | 4 | 27 | 0 | 84 mm | Good | Knysna in July |
| August | 19° / 13° | 4 | 27 | 0 | 75 mm | Good | Knysna in August |
| September | 19° / 14° | 3 | 27 | 0 | 63 mm | Good | Knysna in September |
| October | 20° / 15° | 4 | 27 | 0 | 74 mm | Good | Knysna in October |
| November | 21° / 16° | 4 | 26 | 0 | 64 mm | Good | Knysna in November |
| December | 23° / 17° | 3 | 28 | 0 | 42 mm | Perfect | Knysna in December |