Byron Bay weather in September
Temperature, sea and sunshine in September: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in September
Good
Best time to visit: October – April
What is the weather like in Byron Bay in September?
In September, Byron Bay is warm: daytime highs average 22 °C, and nights cool down to about 15 °C. The sea averages 21.2 °C – refreshing for a swim. With around 9 hours of sunshine a day, there is plenty of sun. Rain falls on about 7 days, adding up to 45 mm. All in all, September is a good month for a holiday in Byron Bay.
September compared
How the weather changes from August to October. Tap a month to open it.
| AugustAug | SeptemberSep | OctoberOct | |
|---|---|---|---|
| Score | 53 | 69 | 77 |
| Day | 20° | 22° | 24° |
| Night | 13° | 15° | 17° |
| Sea | 21° | 21° | 22° |
| Sun | 9 h | 9 h | 9 h |
| Rain days | 7 | 7 | 10 |
More details for September
- Daylight
- 11 h 53 min05:44 – 17:37
- UV index
- 8 · very highclear sky, noon (estimate)All months
- Muggy days
- 0 daysdew point 18 °C or moreAll months
- Wind
- 18 km/haverage daily peakAll months
- Cloud cover
- 35 %on averageAll months
- Hot days
- 0 days30 °C or moreAll months
- Time zone
- UTC+10Australia/Sydney
How the score comes together
- Temperatureweight 35 %52 %
- Seaweight 25 %60 %
- Sunshineweight 20 %100 %
- Few rainy daysweight 20 %78 %
Each factor is rated from 0 to 100 % and weighted for the travel style “Sun, sea & sand”.
What to pack in September
- Swimwear
- Sunscreen
- Sunglasses & sun hat
- A jumper for the evenings
Byron Bay in September: quick answers
Is Byron Bay hot in September?
Warm rather than hot: in September, daytime highs in Byron Bay average 22 °C and nights cool to about 15 °C.
Can you swim in Byron Bay in September?
Yes. In September the sea averages 21.2 °C – refreshing for a swim.
Does it rain much in Byron Bay in September?
Rain falls on about 7 days, adding up to 45 mm.
Byron Bay month by month
The whole year in Byron BayAll destinations: AustraliaWhere to go in SeptemberSea temperature in September
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences