The climate in Kiama during December can be summarized as warm and a little damp.

December is in the summer in Kiama and is typically the 3rd warmest month of the year. Daytime maximum temperatures average around a comfortable 25°C (77°F), whilst at night 15°C (60°F) is normal.

On average December is the 4th driest month of the year in Kiama with around 98mm 3.8 inches of rain making it a a little damp time to visit. This rainfall is typically spread over 11 days, although this may vary considerably.

On the flip side this corresponds to an average of 8 hours of sunshine per day.

The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in Kiama in December 2023.