Click on a day for an hourly weather forecast
The temperatures in Byron Bay in September are comfortable with low of 15°C and and high up to 21°C.
You can expect about 3 to 8 days of rain in Byron Bay 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 Byron Bay in September 2025.
If you’re planning to visit Byron Bay in the near future, we highly recommend that you review the 14 day weather forecast for Byron Bay before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 26° / 22° | 6 | 25 | 0 | 187 mm | Perfect | Byron Bay in January |
| February | 26° / 21° | 8 | 21 | 0 | 230 mm | Good | Byron Bay in February |
| March | 25° / 21° | 8 | 23 | 0 | 235 mm | Good | Byron Bay in March |
| April | 23° / 19° | 6 | 24 | 0 | 166 mm | Perfect | Byron Bay in April |
| May | 21° / 16° | 4 | 27 | 0 | 142 mm | Good | Byron Bay in May |
| June | 19° / 14° | 5 | 25 | 0 | 179 mm | Good | Byron Bay in June |
| July | 18° / 13° | 3 | 28 | 0 | 92 mm | Good | Byron Bay in July |
| August | 19° / 13° | 3 | 28 | 0 | 92 mm | Good | Byron Bay in August |
| September | 21° / 15° | 3 | 27 | 0 | 73 mm | Good | Byron Bay in September |
| October | 23° / 17° | 5 | 26 | 0 | 149 mm | Perfect | Byron Bay in October |
| November | 24° / 19° | 5 | 25 | 0 | 131 mm | Perfect | Byron Bay in November |
| December | 25° / 20° | 7 | 24 | 0 | 188 mm | Good | Byron Bay in December |