Mount Hagen Weather in December
What's the weather like in Mount Hagen (Western Highlands) in December 2025?
The climate in Mount Hagen during December can be summarized as warm, humid and very wet.
December is in the summer in Mount Hagen and is typically the warmest month of the year. Daytime maximum temperatures average around a muggy 30°C (85°F), whilst at night 12°C (54°F) is normal.
| Daytime temperature | 29.7°C 85.4°F |
|---|---|
| Nightly temperature | 12°C 53.5°F |
| Average temperature | 20.8°C 69.4°F |
| Daily sunshine | 4.8 hrs |
| Avg rainfall | 279 mm 11 ins |
| Rainy days | 22 days |
| Sea temperature | 29.4°C 84.9°F |
| Humidity | 77% |
| Windspeed | 11.2kph 7 mph |
On average December is the 4th wettest month of the year in Mount Hagen with around 279mm 11 inches of rain making it a very wet time to visit. This rainfall is typically spread over 22 days, although this may vary considerably.
On the flip side this corresponds to an average of 4.8 hours of sunshine per day.
December temperatures in Mount Hagen
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 Hagen in December 2025.
Other monthly averages
Best places to visit in December
Mount Hagen weather stats
| Hottest month: | January | 29°C 84.2°F |
|---|---|---|
| Driest month: | June | 122mm 4.8ins |
| Sunniest month: | November | 5.1hrs |
| Coldest month: | July | 27.3°C 81.1°F |
| Wettest month: | March | 309mm 12.2ins |
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