Byron Bay Weather in December
What's the weather like in Byron Bay (New South Wales) in December 2025?
The climate in Byron Bay during December can be summarized as warm and wet.
December is in the summer in Byron Bay and is typically the 3rd warmest month of the year. Daytime maximum temperatures average around a comfortable 27°C (81°F), whilst at night 19°C (66°F) is normal.
| Daytime temperature | 27.1°C 80.7°F |
|---|---|
| Nightly temperature | 18.8°C 65.8°F |
| Average temperature | 22.9°C 73.2°F |
| Daily sunshine | 8.8 hrs |
| Avg rainfall | 159 mm 6.3 ins |
| Rainy days | 12 days |
| Sea temperature | 25.1°C 77.1°F |
| Humidity | 63% |
| Windspeed | 15.5kph 10 mph |
On average December is the 6th wettest month of the year in Byron Bay with around 159mm 6.3 inches of rain making it a wet time to visit. This rainfall is typically spread over 12 days, although this may vary considerably.
On the flip side this corresponds to an average of 8.8 hours of sunshine per day.
December temperatures in Byron Bay
December rainfall
December hourly sunshine
The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in Byron Bay in December 2025.
Other monthly averages
Best places to visit in December
Byron Bay weather stats
| Hottest month: | January | 27.4°C 81.3°F |
|---|---|---|
| Driest month: | September | 62mm 2.4ins |
| Sunniest month: | August | 8.6hrs |
| Coldest month: | July | 19.5°C 67.1°F |
| Wettest month: | March | 239mm 9.4ins |
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