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December Weather in Adelaide, South Africa

Last updated: August 31, 2025

In December, the average temperature in Adelaide, South Africa hovers around 20°C (68°F). However, be prepared for a temperature range that can dip to 7°C (45°F) and soar up to a sizzling 39°C (102°F). Expect moderate precipitation with about 70 mm (2.8 in) spread across 11 days, and ensure you stay refreshed amidst an average humidity of 80%.

December Temperature in Adelaide

In December in Adelaide, the average temperature is 20°C (68°F). Maximum temperatures can reach 39°C (102°F), while minimums can drop to as low as 7°C (45°F). Be prepared for a wide range of temperatures if you plan to visit during this month.

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

The chart illustrates December temperature patterns in Adelaide, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Adelaide, December typically has an average temperature of 20°C (68°F), with highs reaching up to 39°C (102°F) and lows dropping to around 7°C (45°F).
JanFebMarAprMayJunJulAugSepOctNovDec717169636057565560636568
Data source: Temperature data for Adelaide 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 Adelaide

In Adelaide in December, the precipitation amount is 70 mm (2.8 in) distributed over 11 days.

December Precipitation Trends in Adelaide

The chart displays monthly precipitation patterns in Adelaide, 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 Adelaide, December typically receives around 70 mm (2.8 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec68916257285122439606070
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Adelaide

In Adelaide in December, humidity is 80%. With an average temperature of 20°C (68°F), this humidity feels like traveling through a warm, dense blanket that clings to your skin, making you feel both sticky and lethargic as you explore the sights.

December Average Humidity in Adelaide

This chart illustrates the average monthly humidity levels in Adelaide, 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 Adelaide is approximately 80%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec80%79%86%85%84%79%77%72%79%77%78%80%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Adelaide

In Adelaide in December, the maximum UV index reaches an alarming 15, which falls into the extreme Exposure Category. With a time to burn of just 10 minutes, it's crucial to take precautions. For detailed information, you can check the Hourly UV Index in Adelaide.

Maximum UV Index Levels in Adelaide for December

The chart shows the monthly maximum UV Index (UVI) for Adelaide 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 Adelaide typically reaches 15, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec151412864469111315
Data source: Adelaide 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 Adelaide Compares to Other Months

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

This table compares monthly weather conditions in Adelaide, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather22°C (71°F)68 mm (2.7 inches)80%extreme
February Weather22°C (71°F)91 mm (3.6 inches)79%extreme
March Weather20°C (69°F)62 mm (2.5 inches)86%extreme
April Weather17°C (63°F)57 mm (2.2 inches)85%very high
May Weather16°C (60°F)28 mm (1.1 inches)84%high
June Weather14°C (58°F)5 mm (0.2 inches)79%moderate
July Weather13°C (56°F)12 mm (0.5 inches)77%moderate
August Weather13°C (55°F)24 mm (1.0 inches)72%high
September Weather16°C (60°F)39 mm (1.5 inches)79%very high
October Weather17°C (63°F)60 mm (2.4 inches)77%extreme
November Weather18°C (65°F)60 mm (2.4 inches)78%extreme
December Weather20°C (68°F)70 mm (2.8 inches)80%extreme

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