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December Weather in Joondalup, Australia

Last updated: August 22, 2025

In December, the average temperature in Joondalup, Australia is a pleasant 23°C (73°F), but be prepared for a range that can swing from a cool 10°C (50°F) to a scorching 40°C (104°F). With an average humidity of 40%, you can expect a relatively dry atmosphere. Don't forget your umbrella, as the area receives about 9 mm (0.3 in) of precipitation over just 1 day this month!

December Temperature in Joondalup

In December in Joondalup, the average temperature is 23°C (73°F). Maximums can reach 40°C (104°F), and minimums can be as low as 10°C (50°F). Travelers should be prepared for a range of temperatures, making it essential to pack both light clothing for the heat and warmer layers for cooler evenings.

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

The chart illustrates December temperature patterns in Joondalup, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Joondalup, December typically has an average temperature of 23°C (73°F), with highs reaching up to 40°C (104°F) and lows dropping to around 10°C (50°F).
JanFebMarAprMayJunJulAugSepOctNovDec757573686259585760636773
Data source: Temperature data for Joondalup 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 Joondalup

In Joondalup in December, the precipitation amount is 9 mm (0.3 in) over the course of 1 day.

December Precipitation Trends in Joondalup

The chart displays monthly precipitation patterns in Joondalup, 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 Joondalup, December typically receives around 9 mm (0.3 inches) of precipitation spread over approximately 1 days.
JanFebMarAprMayJunJulAugSepOctNovDec29582021541001111023939249
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Joondalup

In Joondalup in December, humidity is 40%. With an average temperature of 23°C (73°F), this humidity feels pleasantly comfortable for traveling, allowing you to explore the sights without feeling overheated or sticky.

December Average Humidity in Joondalup

This chart illustrates the average monthly humidity levels in Joondalup, 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 Joondalup is approximately 40%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec40%44%50%65%69%75%74%71%61%51%45%40%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Joondalup

In Joondalup 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 Joondalup, you can check here.

Maximum UV Index Levels in Joondalup for December

The chart shows the monthly maximum UV Index (UVI) for Joondalup 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 Joondalup typically reaches 14, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec141412964468111314
Data source: Joondalup 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 Joondalup Compares to Other Months

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

This table compares monthly weather conditions in Joondalup, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather24°C (75°F)29 mm (1.2 inches)40%extreme
February Weather24°C (75°F)58 mm (2.3 inches)44%extreme
March Weather23°C (73°F)20 mm (0.8 inches)50%extreme
April Weather20°C (68°F)21 mm (0.8 inches)65%very high
May Weather17°C (63°F)54 mm (2.1 inches)69%high
June Weather15°C (59°F)100 mm (3.9 inches)75%moderate
July Weather14°C (58°F)111 mm (4.4 inches)74%moderate
August Weather14°C (58°F)102 mm (4.0 inches)70%high
September Weather15°C (60°F)39 mm (1.5 inches)61%very high
October Weather17°C (63°F)39 mm (1.5 inches)50%extreme
November Weather20°C (68°F)24 mm (0.9 inches)45%extreme
December Weather23°C (73°F)9 mm (0.3 inches)40%extreme

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