Climate - Mumbai (India)

In Mumbai (formerly Bombay), the capital of the state of Maharashtra, the climate is tropical, hot all year round, with a long, sunny season from early or mid-October to early June and a rainy season from June to September or early October. The latter is due to the south-west monsoon and is characterized by stuffy weather, cloud cover and frequent rains, which occur almost every day and are sometimes torrential.
In the pre-monsoon period, from March to May, the heat becomes intense, in fact, the temperature can sometimes reach 38/40 °C (100/104 °F); this partly happens also in the period after the monsoon, in October and November, when it can reach 36/38 °C (97/100 °F).
In winter, from December to February, the weather is normally hot and sunny. During the day, it gets sometimes very hot, in fact, the temperature can reach 35/36 °C (95/97 °F), while at night, it normally returns below 20 °C (68 °F), and from time to time, it can even drop below 15 °C (59 °F): it is better to bring a sweatshirt for safety.
Here are the average temperatures.

As mentioned, the monsoon in Mumbai lasts from June to early October and is definitely intense, since the wet currents come directly from the sea: in July, up to 710 millimeters (28 inches) of rain fall. In July and August, the sky is almost always cloudy, and relative humidity is very high, although the sea breeze gives a bit of relief. In Mumbai, precipitation amounts to about 2,200 mm (86 in) per year. Here is the average precipitation.

The sun in Mumbai regularly shines in the dry season, while in the rainy season, the sky is often cloudy, especially in July and August. Here are the average sunshine hours per day.

Mumbai is in the path of tropical cyclones. Typically, cyclones occur from April to December, with two intensity peaks before and after the monsoon (from late April to early June and in October-November). For a few decades before 2020, cyclones have spared Mumbai, passing to the north or the south, however, recently the city was directly affected by Cyclone Nisarga in early June 2020 and Cyclone Tauktae in mid-May 2021. In any case, even when they pass a certain distance, cyclones can bring heavy rainfall, as happened with Cyclone Phyan in November 2009 and with Cyclone Ockhi in early December 2017.



The Arabian Sea is warm enough for swimming throughout the year, as you can see in the following table.

Best Time

The best months to visit Mumbai are January and February. In November and December, the rains have usually ceased, but a cyclone can sometimes affect this area. In March, it starts to get very hot.

Mumbai - Weather by month

Based on the period 1991-2020

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In January, the coldest month of the year, the weather in Mumbai is usually warm to hot. However, there are remarkable differences between night and day. The average temperature is of 24.0 °C (75 °F), with a minimum of 16.8 °C (62.3 °F) and a maximum of 31.3 °C (88.3 °F).
On the coldest nights of the month, the temperature usually drops to around 12.5 °C (55 °F). However, it dropped to 10 °C (50 °F) in January 1991.
On the warmest days of the month, the temperature usually reaches around 35.5 °C (95.5 °F). However, it reached 37.4 °C (99.3 °F) in January 2006.
Precipitation amounts to only 1 mm (0 in), distributed over 0 days.
The day lasts on average 11 hours and 5 minutes.
There are on average 9 hours of sunshine per day. So, the sun shines 82% of the time.
The average humidity is 55%.
The average wind speed is 7 kph (4 mph).
The average sea temperature is of 25 °C (77.5 °F). Therefore, the sea is warm enough for swimming.

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In February, the weather in Mumbai is usually warm to hot. However, there are remarkable differences between night and day. The average temperature is of 25.0 °C (77 °F), with a minimum of 18.1 °C (64.6 °F) and a maximum of 31.9 °C (89.4 °F).
On the coldest nights of the month, the temperature usually drops to around 14 °C (57 °F). However, it dropped to 8.5 °C (47.3 °F) in February 2008.
On the warmest days of the month, the temperature usually reaches around 37 °C (99 °F). However, it reached 40 °C (104 °F) in February 2017.
Precipitation amounts to only 0 mm (0 in), so on average it never rains in the whole month.
The day lasts on average 11 hours and 30 minutes.
There are on average 9.5 hours of sunshine per day. So, the sun shines 84% of the time.
The average humidity is 55%.
The average wind speed is 7 kph (5 mph).
The average sea temperature is of 25 °C (77 °F). Therefore, the sea is warm enough for swimming.

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In March, the weather in Mumbai is usually warm to hot. The average temperature is of 27.2 °C (81 °F), with a minimum of 21.1 °C (70 °F) and a maximum of 33.3 °C (91.9 °F).
On the coldest nights, the temperature usually drops to around 17 °C (62.5 °F). However, it dropped to 12.7 °C (54.9 °F) in March 2012.
On the warmest days, the temperature usually reaches around 39 °C (102 °F). However, it reached 42 °C (107.6 °F) in March 2018.
Precipitation amounts to only 0 mm (0 in), so on average it never rains in the whole month.
The day lasts on average 12 hours and 5 minutes.
There are on average 9 hours of sunshine per day. So, the sun shines 75% of the time.
The average humidity is 58%.
The average wind speed is 8 kph (5 mph).
The average sea temperature is of 26 °C (78.5 °F). Therefore, the sea is warm enough for swimming.

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In April, the weather in Mumbai is usually very hot. The average temperature is of 28.8 °C (84 °F), with a minimum of 24.1 °C (75.5 °F) and a maximum of 33.5 °C (92.3 °F).
On the coldest nights, the temperature usually drops to around 21 °C (70 °F). However, it dropped to 18.7 °C (65.7 °F) in April 2003.
On the warmest days, the temperature usually reaches around 37.5 °C (99 °F). However, it reached 41 °C (105.8 °F) in April 2009.
Precipitation amounts to only 0 mm (0 in), so on average it never rains in the whole month.
The day lasts on average 12 hours and 35 minutes.
There are on average 9.5 hours of sunshine per day. So, the sun shines 74% of the time.
The average humidity is 66%.
The average wind speed is 9 kph (6 mph).
The average sea temperature is of 27.5 °C (81.5 °F). Therefore, the sea is pleasantly warm and allows long swims.

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In May, the warmest month of the year, the weather in Mumbai is usually very hot. The average temperature is of 30.2 °C (86 °F), with a minimum of 26.7 °C (80.1 °F) and a maximum of 33.8 °C (92.8 °F).
On the coldest nights, the temperature usually drops to around 24 °C (75.5 °F). However, it dropped to 20.4 °C (68.7 °F) in May 2002.
On the warmest days, the temperature usually reaches around 36 °C (97 °F). However, it reached 38.7 °C (101.7 °F) in May 2004.
Precipitation amounts to 20 mm (0.8 in), and all occurs in one day.
The day lasts on average 13 hours and 0 minutes.
There are on average 9 hours of sunshine per day. So, the sun shines 68% of the time.
The average humidity is 69%.
The average wind speed is 11 kph (7 mph).
The average sea temperature is of 29 °C (84.5 °F). Therefore, the sea is pleasantly warm and allows long swims.

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In June, the weather in Mumbai is usually very hot and muggy. The average temperature is of 29.4 °C (85 °F), with a minimum of 26.4 °C (79.5 °F) and a maximum of 32.5 °C (90.4 °F).
On the coldest nights, the temperature usually drops to around 23 °C (73.5 °F). However, it dropped to 20 °C (68 °F) in June 2001.
On the warmest days, the temperature usually reaches around 35.5 °C (95.5 °F). However, it reached 39 °C (102.2 °F) in June 2014.
Precipitation amounts to 530 mm (20.9 in), distributed over 14 days.
The day lasts on average 13 hours and 20 minutes. June 21, the summer solstice, is the longest day of the year in the Northern Hemisphere.
There are on average 4.5 hours of sunshine per day. So, the sun shines 34% of the time.
The average humidity is 77%. Hence, the air is normally humid.
The average wind speed is 13 kph (8 mph).
The average sea temperature is of 29.5 °C (85 °F). Therefore, the sea is pleasantly warm and allows long swims.

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In July, the weather in Mumbai is usually very hot and muggy. The average temperature is of 27.9 °C (82 °F), with a minimum of 25.4 °C (77.7 °F) and a maximum of 30.4 °C (86.8 °F).
On the coldest nights of the month, the temperature usually drops to around 23 °C (73 °F). However, it dropped to 20.4 °C (68.7 °F) in July 1996.
On the warmest days of the month, the temperature usually reaches around 32.5 °C (90.5 °F). However, it reached 34 °C (93.2 °F) in July 1998.
Precipitation amounts to 710 mm (28 in), distributed over 21 days.
The day lasts on average 13 hours and 5 minutes.
There are on average 2.5 hours of sunshine per day. So, the sun shines 20% of the time.
The average humidity is 83%. Hence, the air is normally humid.
The average wind speed is 14 kph (9 mph).
The average sea temperature is of 29 °C (84 °F). Therefore, the sea is pleasantly warm and allows long swims.

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In August, the weather in Mumbai is usually very hot and muggy. The average temperature is of 27.8 °C (82 °F), with a minimum of 25.2 °C (77.4 °F) and a maximum of 30.3 °C (86.6 °F).
On the coldest nights of the month, the temperature usually drops to around 23.5 °C (74 °F). However, it dropped to 21.8 °C (71.2 °F) in August 2017.
On the warmest days of the month, the temperature usually reaches around 32 °C (89.5 °F). However, it reached 33.2 °C (91.8 °F) in August 2020.
Precipitation amounts to 495 mm (19.5 in), distributed over 20 days.
The day lasts on average 12 hours and 40 minutes.
There are on average 2.5 hours of sunshine per day. So, the sun shines 20% of the time.
The average humidity is 82%. Hence, the air is normally humid.
The average wind speed is 13 kph (8 mph).
The average sea temperature is of 28 °C (82.5 °F). Therefore, the sea is pleasantly warm and allows long swims.

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In September, the weather in Mumbai is usually very hot and muggy. The average temperature is of 28.0 °C (82 °F), with a minimum of 24.8 °C (76.7 °F) and a maximum of 31.1 °C (87.9 °F).
On the coldest nights, the temperature usually drops to around 23 °C (73 °F). However, it dropped to 20.7 °C (69.3 °F) in September 1993.
On the warmest days, the temperature usually reaches around 34 °C (93 °F). However, it reached 37.4 °C (99.3 °F) in September 2015.
Precipitation amounts to 330 mm (13 in), distributed over 13 days.
The day lasts on average 12 hours and 10 minutes.
There are on average 5 hours of sunshine per day. So, the sun shines 40% of the time.
The average humidity is 80%. Hence, the air is normally humid.
The average wind speed is 9 kph (5 mph).
The average sea temperature is of 28.5 °C (83 °F). Therefore, the sea is pleasantly warm and allows long swims.

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In October, the weather in Mumbai is usually very hot. The average temperature is of 28.8 °C (84 °F), with a minimum of 23.8 °C (74.9 °F) and a maximum of 33.8 °C (92.8 °F).
On the coldest nights, the temperature usually drops to around 20 °C (68 °F). However, it dropped to 17.9 °C (64.2 °F) in October 2005.
On the warmest days, the temperature usually reaches around 36.5 °C (98 °F). However, it reached 39 °C (102.2 °F) in October 1997.
Precipitation amounts to 80 mm (3.1 in), distributed over 3 days.
The day lasts on average 11 hours and 40 minutes.
There are on average 7.5 hours of sunshine per day. So, the sun shines 66% of the time.
The average humidity is 67%.
The average wind speed is 7 kph (4 mph).
The average sea temperature is of 29 °C (84 °F). Therefore, the sea is pleasantly warm and allows long swims.

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In November, the weather in Mumbai is usually very hot. The average temperature is of 27.8 °C (82 °F), with a minimum of 21.4 °C (70.5 °F) and a maximum of 34.2 °C (93.5 °F).
On the coldest nights, the temperature usually drops to around 18 °C (64 °F). However, it dropped to 14.6 °C (58.3 °F) in November 2012.
On the warmest days, the temperature usually reaches around 36.5 °C (97.5 °F). However, it reached 38.2 °C (100.8 °F) in November 2013.
Precipitation amounts to 15 mm (0.6 in), distributed over 0 days.
The day lasts on average 11 hours and 10 minutes.
There are on average 9 hours of sunshine per day. So, the sun shines 80% of the time.
The average humidity is 56%.
The average wind speed is 7 kph (4 mph).
The average sea temperature is of 28 °C (82 °F). Therefore, the sea is pleasantly warm and allows long swims.

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In December, the weather in Mumbai is usually warm to hot. However, there are remarkable differences between night and day. The average temperature is of 25.5 °C (78 °F), with a minimum of 18.4 °C (65.1 °F) and a maximum of 32.5 °C (90.6 °F).
On the coldest nights of the month, the temperature usually drops to around 14 °C (57.5 °F). However, it dropped to 11.4 °C (52.5 °F) in December 2011.
On the warmest days of the month, the temperature usually reaches around 35 °C (95.5 °F). However, it reached 37.7 °C (99.9 °F) in December 2008.
Precipitation amounts to only 3 mm (0.1 in), distributed over 0 days.
The day lasts on average 11 hours and 0 minutes. December 21, the winter solstice, is the shortest day of the year in the Northern Hemisphere.
There are on average 9 hours of sunshine per day. So, the sun shines 81% of the time.
The average humidity is 55%.
The average wind speed is 7 kph (4 mph).
The average sea temperature is of 26.5 °C (79.5 °F). Therefore, the sea is pleasantly warm and allows long swims.