December weather forecast and climate
Mumbai, India

The iconic ancient arch monument of the Gateway of Mumbai, India
The iconic ancient arch monument of the Gateway of Mumbai, India

Weather in December

The first month of the winter, December, is also a hot month in Mumbai, India, with average temperature fluctuating between 18.6°C (65.5°F) and 32°C (89.6°F).
The ideal sea water temperature of 27°C (80.6°F) and only 0.4 rainfall days, with 5.3mm (0.21") of accumulated rainfall, makes December the best time for swimming and other water activities.

Temperature

In December, the average high-temperature is practically the same as in November - a still hot 32°C (89.6°F). In Mumbai, in December, the average low-temperature is 18.6°C (65.5°F).

Heat index

The average heat index is calculated to be an extremely hot 40°C (104°F). Take extra precautions, as heat cramps and heat exhaustion are possible. Sustained activity may result in heatstroke.
Take into consideration that the heat index values are calculated for shade and light wind conditions. With exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature', 'feels like', 'real feel', or 'apparent temperature', is a calculated temperature value of how hot it feels when the moisture in the air is factored in. This effect is subjective, depending on the activity and individual's heat perception influenced by various reasons (clothing, differences in body mass, height, and shape, metabolic differences). Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.
The human body cools itself through perspiration, as excessive warmth is removed from the body through sweat evaporation. With a lot of moisture in the air, the evaporation process is not as effective, and the body does not cool down as efficiently, creating a perception of overheating. If the body can not disperse the excessive heat and body temperature reaches conditions of hyperthermia, above 37.5°C (99.5°F) to 38.3°C (100.9°F), thermal conditions are potentially life-threatening.

Humidity

In Mumbai, India, the average relative humidity is 69%.

Rainfall

In December, the rain falls for 0.4 days. Throughout December, 5.3mm (0.21") of precipitation is accumulated. Throughout the year, there are 78.9 rainfall days, and 2258mm (88.9") of precipitation is accumulated.

Sea temperature

In December, the average sea temperature is 27°C (80.6°F).
Note: Water temperature between 25°C (77°F) and 29°C (84.2°F) is regarded as very warm and enjoyable by all. With these temperatures, water activities are pleasurable, without feeling uncomfortable for prolonged periods.

Daylight

December has the shortest days of the year in Mumbai, with an average of 11h of daylight.

Sunshine

The average sunshine in Mumbai is 8.2h.

UV index

The month with the lowest UV index is December, with an average maximum UV index of 7. A UV Index reading of 6 to 7 represents a high health hazard from the exposure to the Sun's UV radiation for the average person.
Note: The daily maximum UV index of 7 interpret into the following advice:
Take precautions and utilize sun safety practices. Protection against the skin and eye damage is required. 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. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Beware! The reflection of water and sand dramatically increases exposure to the UV rays.
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FAQ

What is the temperature in December in Mumbai?

The average high-temperature, in December, is 32°C (89.6°F), while the average low-temperature is 18.6°C (65.5°F). The average heat index (a.k.a. 'felt air temperature', 'real feel'), which combines air temperature and relative humidity, in December is calculated to be 40°C (104°F).

What is the average humidity in December in Mumbai?

The average relative humidity in December is 69%.

How many days does it rain in December in Mumbai?

In Mumbai, during December, the rain falls for 0.4 days and regularly aggregates up to 5.3mm (0.21") of precipitation.

How warm is the water in December in Mumbai?

In Mumbai, India, in December, the average water temperature is 27°C (80.6°F). For swimming, diving, and other water activities, temperatures between 25°C (77°F) and 29°C (84.2°F) are perceived as very enjoyable and pleasurable for prolonged periods without feeling uncomfortable.

What is the month with the shortest days in Mumbai?

With an average of 11h of daylight, December has the shortest days of the year in Mumbai, India.

How many hours of daylight does Mumbai have in December?

The average length of the day in December in Mumbai is 11h.

How many hours of sunshine does Mumbai have in December?

In Mumbai, the average sunshine in December is 8.2h.

When is the lowest UV index in Mumbai?

The month with the lowest UV index in Mumbai is December, with an average maximum UV index of 7.

What is the UV index intensity in December in Mumbai?

In December, the average daily maximum UV index in Mumbai, India, is 7. A UV Index reading of 6 to 7 represents a high health vulnerability from unsafe exposure to the Sun's UV rays.

Average temperature in December
Mumbai, India

Average temperature in December - Mumbai, India
  • Average high temperature in December: 32°C

The warmest month (with the highest average high temperature) is November (33.5°C).
The month with the lowest average high temperature is August (29.6°C).

  • Average low temperature in December: 18.6°C

The month with the highest average low temperature is May (26.3°C).
The coldest month (with the lowest average low temperature) is January (16.8°C).

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Average humidity in December
Mumbai, India

Average humidity in December - Mumbai, India
  • Average humidity in December: 69%

Months with the highest relative humidity are July and August (86%).
The month with the lowest relative humidity is February (67%).

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Average rainfall in December
Mumbai, India

Average rainfall in December - Mumbai, India
  • Average rainfall in December: 5.3mm

The wettest month (with the highest rainfall) is July (799.7mm).
The driest month (with the least rainfall) is March (0.2mm).

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Average rainfall days in December
Mumbai, India

Average rainfall days in December - Mumbai, India
  • Average rainfall days in December: 0.4 days

The month with the highest number of rainy days is July (23.2 days).
The month with the least rainy days is March (0 days).

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Average sea temperature in December
Mumbai, India

Average sea temperature in December - Mumbai, India
  • Average sea temperature in December: 27°C

The best month for swimming (with the highest average sea temperature) is June (30°C).
The coldest month (with the lowest average sea temperature) is February (24.9°C).

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Average daylight in December /
Average sunshine in December
Mumbai, India

Average daylight in December / Average sunshine in December - Mumbai, India
  • Average daylight in December: 11h

The month with the longest days is June (Average daylight: 13.3h).
The month with the shortest days is December (Average daylight: 11h).

  • Average sunshine in December: 8.2h

The month with the most sunshine is May (Average sunshine: 9.6h).
Months with the least sunshine are July and August (Average sunshine: 2.4).

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Average UV index in December
Mumbai, India

Average UV index in December - Mumbai, India
  • Average UV index in December: 7

Months with the highest UV index are March, April, May, June, July, August and September (UV index 12).
The month with the lowest UV index is December (UV index 7).

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