Wollongong is renowned for its year-round pleasant weather, thanks to the influences of oceanic and humid subtropical climates. There are no wet and dry seasons, with rainfall occurring throughout the year, although the majority falls in the front half of the year. Wollongong receives an average of 107.4 cloud-free days every year.

The humid subtropical influence means that thunderstorms, lightning, heavy rain and hail can occasionally occur during the summer. July and August receive the most wind, as the prevalence of westerly gales can create wind speeds of up to 100km/h.

Temperatures can go above 40 in the summer months, with a record high of 44.1°C occurring in January. However, the summer is usually characterised by milder temperatures with a high of 25°C and a low 17.9°C. Humidity sits around 68% with the most rain falling at the end of summer, during February and March.

Autumn and Winter see a gradual decline in temperature, although it is still temperate with an average high of 17°C and low of 8.3°C in the coldest month of July. July is also the driest month, with an average of 63.4 millimetres of rain.

Spring is also pleasant, with a high of 22.1°C and low of 12.6°C in October. Humidity sits at around 64%, and rainfall almost doubles from September to October.

The CAMS 2018 conference will be held in the best time of the year to visit Wollongong. December has a balmy average high of 25°C and low of 16°C. Humidity sits at a comfortable 64%, and the wind slows down, meaning you can make the most of all the natural and urban delights that this great city has to offer.

For the entirety of your stay, you’ll be treated to pleasant days and comfortable evenings. The extended sunshine means you don’t have to rush to get everything done, and there’s nothing like relaxing over a meal and drink on a balmy night at one of the city’s premier restaurants and bars.

If you’re a keen hiker our outdoors enthusiast, there’s no better time to check out the incredible Illawarra Escarpment than December. The Spring rains mean the wildflowers will be in bloom, and the Eucalypt forests will be verdant.

The city's unique position on the East coast means that unlike Melbourne and Sydney, Wollongong receives very few heatwaves during the summer. It's unlikely you'll have to suffer through consecutive 40°C days.

Weather Averages for December, Wollongong

  • Record High: 41.5°C
  • Average High: 25°C
  • Daily Mean: 20.7°C
  • Average Low: 16.5°C
  • Record Low: 8.3°C
  • Average Rainfall: 94.6mm
  • Average Rainy Days: 13
  • Average Afternoon Relative Humidity: 64%