Katoomba Weather in December
What's the weather like in Katoomba (New South Wales) in December 2025?
The climate in Katoomba during December can be summarized as warm and a little damp.
December is in the summer in Katoomba and is typically the 3rd warmest month of the year. Daytime maximum temperatures average around a comfortable 26°C (79°F), whilst at night 13°C (54°F) is normal.
| Daytime temperature | 26°C 78.7°F |
|---|---|
| Nightly temperature | 12.5°C 54.4°F |
| Average temperature | 19.2°C 66.6°F |
| Daily sunshine | 8.7 hrs |
| Avg rainfall | 97 mm 3.8 ins |
| Rainy days | 11 days |
| Sea temperature | 22.2°C 72°F |
| Humidity | 52% |
| Windspeed | 12.6kph 8 mph |
On average December is the 5th wettest month of the year in Katoomba with around 97mm 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 8.7 hours of sunshine per day.
December temperatures in Katoomba
December rainfall
December hourly sunshine
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 Katoomba in December 2025.
Other monthly averages
Best places to visit in December
Katoomba weather stats
| Hottest month: | January | 26.4°C 79.5°F |
|---|---|---|
| Driest month: | September | 58mm 2.3ins |
| Sunniest month: | August | 7.3hrs |
| Coldest month: | July | 12.9°C 55.2°F |
| Wettest month: | February | 154mm 6.1ins |
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