December weather forecast
Mumbai, India

December marks the onset of the winter season in Mumbai. The drop in temperature to a low of 18.6°C indicates a cozy chill in the air. The city experiences minimal rainfall of 5mm making it a suitable time for vacationers and locals to delight in outdoor recreational activities. The city is abuzz with yuletide celebrations and the beginning of the festive season. As December progresses, the temperatures fall further, welcoming the New Year with cooler days and nights.

Temperature

The transition into December is marked with an average high-temperature of a still hot 32°C, showing an insignificant shift from November's 33.5°C. Mumbai witnesses a consistent, sharp contrast from the daytime highs, with an average low-temperature of 18.6°C throughout December.

Heat index

The heat index for December is calculated to be a blisteringly hot 40°C. Apply extra caution, heat cramps and heat exhaustion could happen. Heatstroke might occur with long-duration activity.
Bear in mind that the heat index values are determined for shaded areas and light breezes. A rise of up to 15 Fahrenheit (8 Celsius) degrees in the heat index could result from direct sunlight.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', gives a temperature feeling by integrating air temperature and humidity. A person's impression of weather can be shaped by many aspects, among them metabolic variations, pregnancy, and levels of physical activity. In the direct sunlight, the weather's impact can be amplified, possibly boosting the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely vital to babies and toddlers. Young ones often do not realize the necessity to rest and replenish their fluids. Thirst is a delayed indication of dehydration - keeping hydrated, particularly in prolonged physical activity, is crucial.
The evaporation of sweat is a natural cooling mechanism of the human body, facilitated by perspiration. An increase in relative humidity hinders the body's normal cooling function by reducing evaporation, thereby decreasing the rate of body cooling and enhancing the sense of warmth. Heat-related challenges, like dehydration, can be anticipated when body heat isn't managed effectively.

Humidity

In Mumbai, the average relative humidity in December is 69%.

Rainfall

In Mumbai, India, in December, it is raining for 0.4 days, with typically 5mm of accumulated precipitation. Throughout the year, in Mumbai, there are 78.9 rainfall days, and 2258mm of precipitation is accumulated.

Sea temperature

In Mumbai, in December, the average water temperature is 27°C.
Note: Surface water temperatures ranging from 25°C to 29°C are seen as ideal and highly pleasant for extended enjoyment in all water activities.

Daylight

With an average of 11h and 0min of daylight, December has the shortest days of the year in Mumbai, India.
On the first day of the month, sunrise is at 6:55 am and sunset at 5:59 pm. On the last day of December, in Mumbai, sunrise is at 7:11 am and sunset at 6:11 pm IST.

Sunshine

In December, the average sunshine is 8.2h.

UV index

The month with the lowest UV index in Mumbai is December, with an average maximum UV index of 7. A UV Index estimate of 6 to 7 represents a high health risk from unsafe exposure to UV radiation for the ordinary person.
Note: A maximum high daily UV index of 7 during December translates into the following directions:
Follow precautions and abide by sun safety rules. Deterrence of sunburn is imperative. It's important to stay in the shade and limit exposure to the sun from 10 a.m. to 4 p.m., when UV radiation is most intense, although remember that shade structures may not provide full sun protection. Fend off the sun's harsh rays with appropriate clothing, a wide-brim hat, and UV-protective sunglasses. Be careful! The Sun's UV radiation is accentuated by reflecting off sand and water.