Byron Bay Weather in September

September is one of the perfect months to visit Byron Bay, with daytime temperatures of 23°C (73°F) and lows of 15°C (59°F) at night. It is also the driest month of the year.

Rainfall in Byron Bay in September

The month is known for having the least rain of the year. Make the most of the sunshine and clear skies. Expect around 8 days of rain based on historical data, with 51 mm (2 in) average. A fairly balanced picture this month, some wet days but nothing too extreme in terms of intensity.

Temperature in Byron Bay in September

Byron Bay in September has perfect weather. Days reach 23°C (73°F) and nights cool to 15°C (59°F). Overall, the month follows a fairly predictable daily temperature pattern. Nights drop to around 15°C (59°F), which is noticeably cooler than the daytime. A light jacket for the evening is a sensible addition, and the cool nights tend to make sleeping comfortable.

Sunshine in Byron Bay in September

The city usually sees around 240 hours of sunlight, indicating many sunny days — a great month for sightseeing.

Average water temperature in September

With water at 22°C (72°F), you can expect warm, pleasant conditions for any water activity. There's no adjustment period — it feels comfortable straight away.

If your ideal day consists of dry skies and pleasant temperatures, July, August, September and October typically offer the best circumstances for Byron Bay.

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For a detailed overview over the year and the best time to visit Australia, check out our Byron Bay's climate page.

Byron Bay Temperature in September

Min Temperature 15°C (59°F)  

Max Temperature 23°C (73°F)  

Water Temperature 22°C (72°F)  

Chance of Rain 27%  

Precipitation 51 mm (2 in)  

Rainy days 8 days  

Sunshine 240 hours  

Percentage Sunshine  

Daily Historical Temperatures

43-year average (1976-2025)

Based on our historical records, temperatures in Byron Bay typically stay consistent throughout September, with daily highs averaging around 23°C (73°F). Nights are pleasant, with lows typically ranging from 13°C (55°F) to 16°C (61°F).

Average temperatures in September

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Daily Historical Precipitation

43-year average (1976-2025)

Average daily rainfall for each day of the month based on long-term records.

Average precipitation in September

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Historical weather for Byron Bay in September

Browse day-by-day weather records for Byron Bay spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.

Historical weather Temperatures Precipitation

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Byron Bay historical weather extremes in September

Based on 35 years of weather observations in Byron Bay between 1990 and 2025, these are the recorded extremes.

• The hottest September day on record in Byron Bay reached 32°C (90°F) (September 18, 2011).
• The lowest daytime temperature in September was 15°C (59°F), recorded on September 19, 1999.
• The lowest overnight temperature recorded in September was 5°C (41°F) (September 2, 2012).

What to Wear in Byron Bay in September

For Byron Bay in September, you'll want flexible clothing. It's wise to pack cotton shirts, comfortable shorts, and a pair of jeans for cooler evenings. A light sweater or jacket is useful for air-conditioned spaces (like buses) or unexpected cool moments. Rain is likely on several days, so bring a good rain jacket. Expect water temperatures of around 22°C (72°F), which is ideal for taking a refreshing dip. Bring swimwear and consider packing a towel for drying off. Don't forget sun protection, sunglasses, sunscreen, and a hat. These are all good ideas with this much sunshine.

What To Do in Byron Bay in September

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Cycling

10/10

Walking

10/10

Barbeque

9/10

Camping

8/10

Outdoor sports

10/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit Australia, check out our Byron Bay's climate page.

More climate data for Byron Bay

Temperature Rainfall Sunshine Water Temp

See the full Byron Bay climate overview or explore weather in Australia.