December weather forecastByron Bay, Australia

December

Weather in December

Ending the year on a relatively warm note, December in Byron Bay showcases a balanced mix of breezy conditions and warm temperatures. The average peak daytime temperature rises to 25.5°C (77.9°F), denoting the arrival of the heat of the summer. However, cloud cover surges to an annual high, accounting for 39% of December skies. These moderately dense clouds cast interesting moods across the bay, enhancing its natural beauty. As one transitions into January, a slight dip in temperature can be witnessed, indicating the cyclic nature of weather in Byron Bay.

Temperature

The arrival of December in Byron Bay brings an average high-temperature of a still warm 25.5°C (77.9°F), closely following the temperature pattern of November. Nights in December showcase an average temperature of 20.8°C (69.4°F), slightly cooler than the daytime.

Humidity

In December, the average relative humidity in Byron Bay is 77%.

Rainfall

In December, in Byron Bay, the rain falls for 18.6 days. Throughout December, 79mm (3.11") of precipitation is accumulated. In Byron Bay, during the entire year, the rain falls for 197.8 days and collects up to 867mm (34.13") of precipitation.

Sea temperature

In Byron Bay, in December, the average water temperature is 25.3°C (77.5°F).
Note: Ideal surface water temperatures for any water activity fall between 25°C (77°F) and 29°C (84.2°F), offering maximum enjoyment for lengthened periods.

Daylight

December has the longest days of the year, with an average of 13h and 54min of daylight.
On the first day of December, sunrise is at 5:39 am and sunset at 7:29 pm. On the last day of the month, sunrise is at 5:50 am and sunset at 7:46 pm AEDT.

Sunshine

In Byron Bay, the average sunshine in December is 9.6h.

UV index

The months with the highest UV index are January through March, October through December, with an average maximum UV index of 6. A UV Index of 6 to 7 symbolizes a high health vulnerability from exposure to the Sun's UV rays for average individuals.
Note: In December, a regular UV index of 6 translates into these guidelines:
Avoid excessive sunlight. Those with lighter skin may experience burning in less than 20 minutes. From 10 a.m. to 4 p.m., when UV radiation is at its strongest, limit direct exposure to the Sun and note that shade structures may not provide full sun protection. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays. Beware! The strength of the UV rays is significantly increased by the reflection of the water and sand.

Updated: Jan 26, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

Byron Bay in December has an average high-temperature of 25.5°C (77.9°F) and an average low-temperature of 20.8°C (69.4°F).

In December, the average relative humidity is 77%.

In Byron Bay, during December, the rain falls for 18.6 days and regularly aggregates up to 79mm (3.11") of precipitation.

In Byron Bay, the average seawater temperature in December is 25.3°C (77.5°F). For swimming, diving, and other water activities, temperatures between 25°C (77°F) and 29°C (84.2°F) are perceived as very enjoyable and pleasurable for prolonged periods without feeling uncomfortable.

With an average of 13h and 54min of daylight, December has the longest days of the year in Byron Bay.

In December, the average day length in Byron Bay is 13h and 56min.

In December, on the first day of the month, sunrise is at 5:39 am and sunset at 7:29 pm. On the last day of the month, in Byron Bay, sunrise is at 5:50 am and sunset at 7:46 pm AEDT.

In December, the average sunshine duration in Byron Bay, Australia, is 9.6h.

The months with the highest UV index in Byron Bay, Australia, are January through March, October through December, with an average maximum UV index of 6.

The average daily maximum UV index in December is 6. A UV Index of 6 to 7 symbolizes a high health risk from exposure to the Sun's UV radiation.

Today

Tomorrow

Long-term

Year J F M A M J J A S O N December

Nov

December

Jan

Average high temperature

24.6°C

25.5°C

26.5°C

Average low temperature

Average pressure

Average wind speed

Average max. wind speed

18.9km/h

18.5km/h

17.8km/h

Average wind speed gusts

Average humidity

Average rainfall

Average rainfall days

14.4

18.6

16.3

Average sea temperature

Average daylight

Average sunshine

Average sunshine days

12.7

9.3

11.8

Average UV index

Average cloud cover

31%

39%

Average visibility

10km

Average temperature in December
Byron Bay, Australia

Average high temperature in December: 25.5°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 December: 20.8°C

The 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 pressure in December
Byron Bay, Australia

Average pressure in December: 1013.6mbar

The month with the highest atmospheric pressure is July (1020.5mbar).
The month with the lowest atmospheric pressure is January (1012.8mbar).

Average wind speed in December
Byron Bay, Australia

Average wind speed in December: 17.4km/h

The windiest month (with the highest average wind speed) is October (18km/h).
The calmest month (with the lowest average wind speed) is May (15.3km/h).

Average humidity in December
Byron Bay, Australia

Average humidity in December: 77%

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

Average rainfall in December
Byron Bay, Australia

Average rainfall in December: 79mm

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

Average rainfall days in December
Byron Bay, Australia

Average rainfall days in December: 18.6 days

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

Average sea temperature in December
Byron Bay, Australia

Average sea temperature in December: 25.3°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 December /
Average sunshine in December
Byron Bay, Australia

Average daylight in December: 13h and 54min

The month with the longest days is December (Average daylight: 13h and 54min).
The month with the shortest days is June (Average daylight: 10h and 24min).

Average sunshine in December: 9h and 36min

The month with the most sunshine is November (Average sunshine: 10h and 30min).
The month with the least sunshine is June (Average sunshine: 5h and 48min).

Average sunshine days in December
Byron Bay, Australia

Average sunshine days in December: 9.3 days

The month with the most sunshine days is August (17.3 days).
The month with the least sunshine days is March (5.8 days).

Average UV index in December
Byron Bay, Australia

Average UV index in December: 6

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

Average cloud cover in December
Byron Bay, Australia

Average cloud cover in December: 39

The months with the most cloud cover are February and March (Cloud cover 44).
The month with the least cloud cover is August (Cloud cover 21).

Average visibility in December
Byron Bay, Australia

Average visibility in December: 10km

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).