Mount Isa Weather in December
What's the weather like in Mount Isa (Queensland) in December 2025?
The climate in Mount Isa during December can be summarized as very hot and reasonably dry.
December is in the summer in Mount Isa and is typically the 2nd warmest month of the year. Daytime maximum temperatures average around a warm 37°C (99°F), whilst at night 22°C (72°F) is normal.
| Daytime temperature | 37°C 98.6°F |
|---|---|
| Nightly temperature | 22.4°C 72.3°F |
| Average temperature | 29.7°C 85.5°F |
| Daily sunshine | 10.1 hrs |
| Avg rainfall | 60 mm 2.4 ins |
| Rainy days | 7 days |
| Sea temperature | 28.3°C 82.9°F |
| Humidity | 31% |
| Windspeed | 12.2kph 8 mph |
On average December is the 3rd wettest month of the year in Mount Isa with around 60mm 2.4 inches of rain making it a reasonably dry time to visit. This rainfall is typically spread over 7 days, although this may vary considerably.
On the flip side this corresponds to an average of 10.1 hours of sunshine per day.
December temperatures in Mount Isa
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 Mount Isa in December 2025.
Other monthly averages
Best places to visit in December
Mount Isa weather stats
| Hottest month: | January | 35.9°C 96.6°F |
|---|---|---|
| Driest month: | August | 7mm 0.3ins |
| Sunniest month: | August | 10.8hrs |
| Coldest month: | July | 23.4°C 74.1°F |
| Wettest month: | January | 97mm 3.8ins |
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