Mersing Weather in December
What's the weather like in Mersing (Johor) in December 2025?
The climate in Mersing during December can be summarized as hot, humid and very wet.
December is in the winter in Mersing and is typically the coldest month of the year. Daytime maximum temperatures average around a steamy 28°C (83°F), whilst at night 23°C (74°F) is normal.
| Daytime temperature | 28.3°C 82.9°F |
|---|---|
| Nightly temperature | 23.1°C 73.6°F |
| Average temperature | 25.7°C 78.3°F |
| Daily sunshine | 4.4 hrs |
| Avg rainfall | 580 mm 22.8 ins |
| Rainy days | 26 days |
| Sea temperature | 28.3°C 83°F |
| Humidity | 86% |
| Windspeed | 12.6kph 8 mph |
On average December is the wettest month of the year in Mersing with around 580mm 22.8 inches of rain making it a very wet time to visit. This rainfall is typically spread over 26 days, although this may vary considerably.
On the flip side this corresponds to an average of 4.4 hours of sunshine per day.
December temperatures in Mersing
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 Mersing in December 2025.
Other monthly averages
Best places to visit in December
Mersing weather stats
| Hottest month: | May | 31.8°C 89.2°F |
|---|---|---|
| Driest month: | June | 153mm 6ins |
| Sunniest month: | March | 7.5hrs |
| Coldest month: | December | 28.2°C 82.8°F |
| Wettest month: | December | 580mm 22.8ins |
© Google