December weather forecast
Mangaluru, India

The first month of the winter, December, is also a hot month in Mangaluru, India, with an average temperature varying between 32.8°C (91°F) and 21.2°C (70.2°F).
The ideal sea water temperature of 28.6°C (83.5°F) and only 0.6 rainfall days, with 16mm (0.63") of accumulated rainfall, makes December the best time for swimming and other water activities.

Temperature

The transition into December reveals an average high-temperature of a still hot 32.8°C (91°F), mirroring a close resemblance to November. During December, Mangaluru sees a mean low-temperature of 21.2°C (70.2°F).

Heat index

The heat index value for December is appraised at a scorching 41°C (105.8°F). Additional precautions are required to avert heat cramps and heat exhaustion. Persistent activity may culminate in heatstroke.
Heat index details are generally centered around shaded locations and a mild breeze. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'felt air temperature', is a composite of temperature and humidity figures to convey how warm it feels. The impact of temperature is individual, as people's perception of weather may change based on their body mass, height, and physical activity. It is noteworthy to mention that direct sunlight exposure can augment the felt temperature, leading to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical for babies and toddlers. Children often overlook the necessity for resting and fluid replenishment. Thirst is a late sign of dehydration - thus, it is critical to stay hydrated, especially during extended periods of physical activities.
When it comes to cooling down, the human body's primary method is through perspiration, making use of sweat evaporation to eliminate excess heat. When relative humidity is on the rise, it curtails evaporation, thereby reducing the heat elimination from the body and causing the feeling of being excessively hot. Accumulating heat beyond the body's cooling measures leads to rising temperatures and potential ailments.

Humidity

In Mangaluru, the average relative humidity in December is 65%.

Rainfall

In Mangaluru, during December, the rain falls for 0.6 days and regularly aggregates up to 16mm (0.63") of precipitation. Throughout the year, in Mangaluru, there are 111.9 rainfall days, and 3797mm (149.49") of precipitation is accumulated.

Sea temperature

In Mangaluru, in December, the average water temperature is 28.6°C (83.5°F).
Note: In water activities such as swimming and diving, temperatures from 25°C (77°F) to 29°C (84.2°F) are deemed highly pleasurable for extended periods without any unease.

Daylight

With an average of 11h and 24min of daylight, December has the shortest days of the year in Mangaluru.
On the first day of the month, sunrise is at 6:37 am and sunset at 6:02 pm. On the last day of December, in Mangaluru, sunrise is at 6:52 am and sunset at 6:15 pm IST.

Sunshine

The average sunshine in December in Mangaluru is 9.4h.

UV index

With an average maximum UV index of 9, December is the month with the lowest UV index. A UV Index value of 8 to 10 symbolizes a very high health vulnerability from exposure to the Sun's UV radiation for the ordinary person.
Note: The daily high UV index of 9 in December translates into this advice:
Always remain cautious. Unprotected skin and eyes are prone to swift harm. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. In bright sunlight, prioritize sunglasses that grant protection from UVA and UVB radiation. Applying and reapplying liberally a broad-spectrum sunscreen of SPF 30+ every two hours, and straight after a swim or outdoor activity is recommended. Watch out! Sand and water enhance the UV exposure you receive.