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December Weather in Mortlake, Australia

Last updated: August 22, 2025

In Mortlake, Australia, the average temperature in December hovers around 17°C (62°F), with a minimum of 3°C (37°F) and a peak of 43°C (109°F). Visitors can expect about 46 mm (1.8 in) of precipitation spread over 6 days, contributing to an average humidity of 69%. Plan your activities accordingly to enjoy all that this stunning location has to offer!

December Temperature in Mortlake

In December in Mortlake, the average temperature is 17°C (62°F). Maximum temperatures can reach 43°C (109°F), while minimums can drop as low as 3°C (37°F). Be prepared for a wide range of temperatures during your travels!

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

The chart illustrates December temperature patterns in Mortlake, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Mortlake, December typically has an average temperature of 17°C (62°F), with highs reaching up to 43°C (109°F) and lows dropping to around 3°C (37°F).
JanFebMarAprMayJunJulAugSepOctNovDec666463575248474851555962
Data source: Temperature data for Mortlake 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 Mortlake

In Mortlake in December, the precipitation amount is 46 mm (1.8 in) over a span of 6 days.

December Precipitation Trends in Mortlake

The chart displays monthly precipitation patterns in Mortlake, 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 Mortlake, December typically receives around 46 mm (1.8 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec403241516940586969747346
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Mortlake

In Mortlake in December, humidity is 69%. With an average temperature of 17°C (62°F), this humidity feels like a damp embrace, making traveling a bit uncomfortable as the air hangs heavy around you, causing you to sweat slightly more than usual and prompting a desire for refreshing breaks in shaded areas.

December Average Humidity in Mortlake

This chart illustrates the average monthly humidity levels in Mortlake, 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 Mortlake is approximately 69%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec65%67%71%75%80%80%81%79%76%72%72%69%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Mortlake

In Mortlake in December, the maximum UV index is 14, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, so it's crucial to take precautions. For the detailed hourly UV index in Mortlake, you can check here.

Maximum UV Index Levels in Mortlake for December

The chart shows the monthly maximum UV Index (UVI) for Mortlake 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 Mortlake typically reaches 14, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec14121174335791214
Data source: Mortlake 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 Mortlake Compares to Other Months

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

This table compares monthly weather conditions in Mortlake, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather19°C (67°F)40 mm (1.6 inches)65%extreme
February Weather18°C (64°F)32 mm (1.2 inches)67%extreme
March Weather17°C (63°F)41 mm (1.6 inches)71%extreme
April Weather14°C (58°F)51 mm (2.0 inches)75%high
May Weather11°C (52°F)69 mm (2.7 inches)80%moderate
June Weather9°C (48°F)40 mm (1.6 inches)80%moderate
July Weather9°C (48°F)58 mm (2.3 inches)80%moderate
August Weather9°C (48°F)69 mm (2.7 inches)79%moderate
September Weather10°C (51°F)69 mm (2.7 inches)76%high
October Weather13°C (55°F)74 mm (2.9 inches)72%very high
November Weather15°C (59°F)73 mm (2.9 inches)72%extreme
December Weather17°C (62°F)46 mm (1.8 inches)69%extreme

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