Sydney weather in December 2025

Expect 26°C daytime maximum temperatures in the shade with on average 8 hours of sunshine per day in Sydney in December. Check more long-term weather averages for Sydney in December before you book your next holiday to New South Wales in 2025/2026.

  • 26°C maximum daytime temperature in December in Sydney26
    26°C max day temperature
  • 8 hours of sunshine per day
  • 10 days with some rainfall in December in Sydney10
    10 days with some rainfall
  • 18°C minimum night-time temperature in December in Sydney18
    18°C min night temperature
  • 14 hours of daylight per day in December in Sydney14
    14 hours of daylight per day
  • Low heat & humidity in December in SydneyL
    Low heat & humidity
  • 86 mm monthly rainfall in December in Sydney86
    86 mm of monthly rainfall
  • UV (maximum) index 11+ (Extreme) in December in Sydney11
    11+ (Extreme) UV index
  • 21°C sea temperature in December in Sydney21
    21°C sea temperature

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The December weather guide for New South Wales (Sydney) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Metric (°C / mm)  |  Imperial (°F / inches)

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More about Australia

How hot is it in Sydney in December?

Daytime temperatures usually reach 26°C in Sydney in December with low heat and humidity, falling to 18°C at night.

How sunny is it in Sydney in December?

There are normally 8 hours of bright sunshine each day in Sydney in December - that's 54% of daylight hours.

How warm is the sea around Sydney in December?

The average sea temperature around Sydney in December is 21°C.

Does it rain in Sydney in December?

There are usually 10 days with some rain in Sydney in December and the average monthly rainfall is 86mm.

Sydney December sunrise & sunset times

Browse the sunrise and sunset times for Sydney in December 2025. Select a month to view Sydney sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st December 2025 04:37 18:51
Tuesday, 16th December 2025 04:39 19:03
Wednesday, 31st December 2025 04:47 19:09

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