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December Weather in Sydney, Canada

Last updated: June 18, 2025

In December, the average temperature in Sydney, Canada hovers around 0°C (33°F). However, be prepared for a range of temperatures, with lows dipping to -15°C (6°F) and highs reaching up to 13°C (56°F). Expect approximately 134 mm (5.3 in) of precipitation spread over 15 days, contributing to an average humidity of 83%. Whether you're braving the chill or enjoying the occasional warmth, pack accordingly for a well-rounded experience!

December Temperature in Sydney

In December in Sydney, the average temperature is 0°C (33°F). Maximum temperatures can reach 13°C (56°F), while minimums can drop as low as -15°C (6°F). Travelers should be prepared for cold conditions and pack accordingly to enjoy their stay.

December Weather in Sydney: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Sydney, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Sydney, December typically has an average temperature of 0°C (33°F), with highs reaching up to 13°C (56°F) and lows dropping to around -15°C (6°F).
JanFebMarAprMayJunJulAugSepOctNovDec272528374455646860514133
Data source: Temperature data for Sydney generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

December Precipitation in Sydney

In Sydney in December, the total precipitation amount is 134 mm (5.3 in) spread over a period of 15 days.

December Precipitation Trends in Sydney

The chart displays monthly precipitation patterns in Sydney, with values for each month alongside December’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how December’s conditions compare to those of other months. In Sydney, December typically receives around 134 mm (5.3 inches) of precipitation spread over approximately 15 days.
JanFebMarAprMayJunJulAugSepOctNovDec113131118140109102936893108182134
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Sydney

In Sydney in December, humidity is 83%. With an average temperature of 0°C (33°F), this humidity feels like a cold, damp chill that cuts through layers of clothing, making travel uncomfortable and brisk as each breath fills the lungs with icy moisture.

December Average Humidity in Sydney

This chart illustrates the average monthly humidity levels in Sydney, with December’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In December, average humidity in Sydney is approximately 83%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%87%87%87%88%89%91%90%86%82%83%83%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Sydney

In Sydney in December, the maximum UV index is 2, which corresponds to a low exposure category. With this level of UV radiation, the time to burn is approximately 45 minutes. To learn more about the hourly UV index in Sydney, you can visit Hourly UV Index in Sydney.

Maximum UV Index Levels in Sydney for December

The chart shows the monthly maximum UV Index (UVI) for Sydney in December, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In December, the maximum UV index in Sydney typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2357910887532
Data source: Sydney December UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How December Weather in Sydney Compares to Other Months

Weather in Sydney varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Sydney, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Sydney, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-3°C (27°F)113 mm (4.5 inches)86%low
February Weather-4°C (25°F)131 mm (5.2 inches)87%moderate
March Weather-2°C (29°F)118 mm (4.6 inches)87%moderate
April Weather3°C (37°F)140 mm (5.5 inches)87%high
May Weather7°C (45°F)109 mm (4.3 inches)88%very high
June Weather13°C (55°F)102 mm (4.0 inches)89%very high
July Weather18°C (64°F)93 mm (3.7 inches)91%very high
August Weather20°C (68°F)68 mm (2.7 inches)90%very high
September Weather16°C (60°F)93 mm (3.7 inches)86%high
October Weather10°C (51°F)108 mm (4.2 inches)82%moderate
November Weather5°C (42°F)182 mm (7.2 inches)83%moderate
December Weather0°C (33°F)134 mm (5.3 inches)83%low

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