Byron Bay
Australia
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Byron Bay, Australia

September, the first month of the spring, in Byron Bay, is an agreeable month, with average temperature fluctuating between 15.6°C (60.1°F) and 21.4°C (70.5°F).

Temperature

In Byron Bay, the average high-temperature is relatively the same as in August - a pleasant 21.4°C (70.5°F). In September, the average low-temperature is 15.6°C (60.1°F).

Humidity

The average relative humidity in September is 71%.

Rainfall

September is the month with the least rainfall in Byron Bay. Rain falls for 10.5 days and accumulates 29mm (1.14") of precipitation.

Sea temperature

In Byron Bay, the average water temperature is 21.9°C (71.4°F).
Note: For swimming, a surface water temperature of 21.9°C (71.4°F) is not enjoyable for the majority. It is not considered safe, as controlling breathing becomes progressively more difficult as water temperature decreases below 21°C (69.8°F).

Daylight

In Byron Bay, the average length of the day in September is 11.9h.

Sunshine

In Byron Bay, Australia, the average sunshine is 9.1h.

UV index

Months with the lowest UV index in Byron Bay are April through September, with an average maximum UV index of 5. A UV Index estimate of 3 to 5 represents a moderate health risk from the exposure to the Sun's UV rays for ordinary individuals.
Note: The average daily UV index of 5 transform into the following instructions:
Take precautions - Protection against sunburn is recommended. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Beware! The strength of the UV rays is significantly increased by the reflection of the water and sand.

What is the temperature in September in Byron Bay?

In September, the average high-temperature is 21.4°C (70.5°F), and the average low-temperature is 15.6°C (60.1°F).

What is the average humidity in September in Byron Bay?

The average relative humidity in September in Byron Bay is 71%.

How much does it rain in Byron Bay in September?

In Byron Bay, Australia, in September, during 10.5 rainfall days, 29mm (1.14") of precipitation is typically accumulated.

What is the driest month in Byron Bay?

September is the month with the least rainfall in Byron Bay, Australia. Rain falls for 10.5 days and accumulates 29mm (1.14") of precipitation.

What is the sea water temperature in September in Byron Bay?

In September, the average sea temperature in Byron Bay is 21.9°C (71.4°F). For swimming, a surface water temperature of 21.9°C (71.4°F) is not enjoyable for the majority. It is not considered safe, as controlling breathing becomes progressively more difficult as water temperature decreases below 21°C (69.8°F).

What is the average length of the day in September in Byron Bay?

The average length of the day in September is 11.9h.

How many hours of sunshine does Byron Bay have in September?

In Byron Bay, Australia, the average sunshine in September is 9.1h.

What is the month with the lowest UV index in Byron Bay?

Months with the lowest UV index are April through September, with an average maximum UV index of 5.

How high is the UV index in September in Byron Bay?

The average daily maximum UV index in September in Byron Bay, Australia, is 5. A UV Index estimate of 3 to 5 represents a moderate vulnerability from unprotected exposure to the UV radiation.
Average temperature in September - Byron Bay, Australia
  • Average high temperature in September: 21.4°C

The warmest month (with the highest average high temperature) is January (26.5°C).
The month with the lowest average high temperature is July (18.3°C).

  • Average low temperature in September: 15.6°C

Months with the highest average low temperature are January and February (21.8°C).
The coldest month (with the lowest average low temperature) is July (13.3°C).

Average humidity in September - Byron Bay, Australia
  • Average humidity in September: 71%

The month with the highest relative humidity is March (80%).
The month with the lowest relative humidity is August (70%).

Average rainfall in September - Byron Bay, Australia
  • Average rainfall in September: 29mm

The wettest month (with the highest rainfall) is February (123mm).
The driest month (with the lowest rainfall) is September (29mm).

Average rainfall days in September - Byron Bay, Australia
  • Average rainfall days in September: 10.5 days

The month with the highest number of rainy days is March (23.1 days).
The month with the lowest number of rainy days is September (10.5 days).

Average sea temperature in September - Byron Bay, Australia
  • Average sea temperature in September: 21.9°C

The best month for swimming (with the highest average sea temperature) is February (27.2°C).
The coldest month (with the lowest average sea temperature) is August (21.5°C).

Average daylight in September / Average sunshine in September - Byron Bay, Australia
  • Average daylight in September: 11.9h

The month with the longest days is December (Average daylight: 13.9h).
The month with shortest days is June (Average daylight: 10.3h).

  • Average sunshine in September: 9.1h

The month with most sunshine is November (Average sunshine: 10.5h).
The month with least sunshine is June (Average sunshine: 5.8h).

Average UV index in September - Byron Bay, Australia
  • Average UV index in September: 5

Months with the highest UV index are January, February, March, October, November and December (UV index 6).
Months with the lowest UV index are April, May, June, July, August and September (UV index 5).