Monthly climate guide
Byron Bay weather in September
With highs near 21°C (70°F) and lows around 18°C (65°F), September feels warm in Byron Bay. Rainfall averages about 27 mm (fairly dry) and the sky is a mix of sun and cloud. Daytime highs are about the same as August and about the same as October.
What stands out in September
- Days and nights are close, only about 3°C apart.
- It's one of the drier months, with about 72% less rain than Byron Bay's average.
- In Byron Bay, September is early spring — the seasons are reversed south of the equator.
- It's one of the sunniest months here, with cloud cover around 38%.
It's usually the driest month of the year.
Avg high
21°C
70°F
Avg low
18°C
65°F
Rainfall
27 mm
fairly dry
Humidity
72%
relative
Sky
38%
cloud · a mix of sun and cloud
Byron Bay weather by month
Show the monthly averages as a table
| Month | Avg high | Avg low | Rain | Humidity | Cloud cover |
|---|---|---|---|---|---|
| January | 26°C / 79°F | 24°C / 75°F | 176 mm | 77% | 55% |
| February | 26°C / 79°F | 24°C / 75°F | 162 mm | 77% | 56% |
| March | 26°C / 78°F | 24°C / 74°F | 183 mm | 77% | 60% |
| April | 24°C / 75°F | 22°C / 71°F | 92 mm | 74% | 51% |
| May | 22°C / 71°F | 19°C / 67°F | 60 mm | 71% | 50% |
| June | 20°C / 68°F | 18°C / 64°F | 112 mm | 72% | 55% |
| July | 20°C / 67°F | 17°C / 62°F | 38 mm | 70% | 43% |
| August | 20°C / 68°F | 17°C / 62°F | 50 mm | 68% | 37% |
| September | 21°C / 70°F | 18°C / 65°F | 27 mm | 72% | 38% |
| October | 23°C / 73°F | 20°C / 67°F | 64 mm | 74% | 48% |
| November | 24°C / 75°F | 21°C / 71°F | 72 mm | 75% | 51% |
| December | 25°C / 77°F | 23°C / 73°F | 117 mm | 76% | 58% |
What to pack for September
- T-shirts plus a light layer for the evening
- Comfortable trainers or sandals for long walks
- Sunglasses
Is September a good time to visit Byron Bay?
Compare the months in the chart above to find your ideal window.
Best time to visit Byron Bay →Other Australia cities in September
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Byron Bay weather in September. WeatherCompare, 2026 (NASA POWER / ERA5, 2011–2020 monthly averages). https://weathercompare.eu/weather/australia/byron-bay/september
<a href="https://weathercompare.eu/weather/australia/byron-bay/september">Byron Bay weather in September</a> (WeatherCompare)
<iframe src="https://weathercompare.eu/embed/australia/byron-bay" width="300" height="160" style="border:0;border-radius:12px" loading="lazy" title="Byron Bay weather in September"></iframe> <p style="font-size:12px"><a href="https://weathercompare.eu/weather/australia/byron-bay/september">Byron Bay weather in September</a> – WeatherCompare</p>
Byron Bay in September: quick answers
Is September a good time to visit Byron Bay?
Yes. September is one of the best months for Byron Bay, with highs around 21°C and about 27 mm of rain.
How warm is Byron Bay in September?
Average highs are about 21°C (70°F) and average lows about 18°C (65°F), based on 10 years of daily data.
Does it rain a lot in Byron Bay in September?
Byron Bay typically gets around 27 mm of rain in September — fairly dry. It's usually the driest month of the year.
Figures are long-term averages for the area around Byron Bay (NASA POWER / ERA5, 2011–2020), not a forecast for a specific year. For upcoming days, see the live multi-source forecast.