September 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 September

The last month of the rainy (monsoon) season, September, is a hot month in Mumbai, India, with average temperature fluctuating between 30.4°C (86.7°F) and 24.3°C (75.7°F).

Temperature

In Mumbai, the average high-temperature is essentially the same as in August - a tropical 30.4°C (86.7°F). In Mumbai, the average low-temperature is 24.3°C (75.7°F).

Heat index

The average heat index in September is calculated to be a sweltering 39.9°C (103.8°F). Take extra precautions, as heat cramps and heat exhaustion are possible. Sustained activity may result in heatstroke.
Note that heat index values are valued for light wind and location in the shade. 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 'feels like', 'apparent temperature', 'real feel', or 'felt air temperature', is a measure that combines air temperature and relative humidity into a single value that indicates how hot the weather feels. Additional factors like activity, metabolic differences, differences in body mass, height, and shape, and wind affect individual temperature impact. 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 particularly important for children. 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 normally cools itself by perspiration. Excessive warmth is eliminated from the body by evaporation of sweat. A higher relative humidity affects normal body cooling by reducing the evaporation rate, subsequently lowering the rate at which the body cools and increasing the perception of heat. 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, the average relative humidity is 83%.

Rainfall

In Mumbai, during 14.4 rainfall days, 312.3mm (12.3") of precipitation is typically accumulated. Throughout the year, there are 78.9 rainfall days, and 2258mm (88.9") of precipitation is accumulated.

Sea temperature

In September, the average sea temperature in Mumbai, India, is 28.7°C (83.7°F).
Note: For any water activity, surface water temperatures between 25°C (77°F) and 29°C (84.2°F) are considered as excellent and extremely pleasant for lengthened periods.

Daylight

In September, the average length of the day in Mumbai is 12.2h.

Sunshine

In September, the average sunshine in Mumbai is 5.5h.

UV index

Months with the highest UV index are March through September, with an average maximum UV index of 12. A UV Index value of 11, and more, symbolizes an extreme threat to health from unprotected exposure to the Sun's UV rays for average individuals.
Note: In September, the average maximum UV index of 12 translate into the following recommendations:
Practice all-important precautions. Light skin people may get burned in less than 5 minutes. 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. A broad-spectrum sunscreen of SPF 30+ should be liberally applied and re-applied every two hours, and immediately after an outdoor workout or a swim. Caution! The reflection of sand and water significantly increases the intensity of the Sun's UV radiation.
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FAQ

What is the temperature in September in Mumbai?

In September, in Mumbai, the average high-temperature is 30.4°C (86.7°F), and the average low-temperature is 24.3°C (75.7°F). In September, the average heat index (a.k.a. 'feels like', 'felt air temperature'), which combines air temperature and relative humidity, is calculated to be 39.9°C (103.8°F).

What is the average humidity in September in Mumbai?

In September, the average relative humidity in Mumbai is 83%.

How much does it rain in Mumbai in September?

In Mumbai, in September, during 14.4 rainfall days, 312.3mm (12.3") of precipitation is typically accumulated.

What is the sea water temperature in September in Mumbai?

In September, the average sea temperature is 28.7°C (83.7°F). For any water activity, surface water temperatures between 25°C (77°F) and 29°C (84.2°F) are considered as excellent and extremely pleasant for lengthened periods.

What is the average length of the day in September in Mumbai?

In September, the average length of the day in Mumbai is 12.2h.

How many hours of sunshine does Mumbai have in September?

In Mumbai, the average sunshine in September is 5.5h.

What is the month with the highest UV index in Mumbai?

Months with the highest UV index in Mumbai, India, are March through September, with an average maximum UV index of 12.

How high is the UV index in September in Mumbai?

In Mumbai, India, the average daily maximum UV index in September is 12. A UV Index of 11, and more, symbolizes an extreme health vulnerability from unprotected exposure to the UV radiation.

Average temperature in September
Mumbai, India

Average temperature in September - Mumbai, India
  • Average high temperature in September: 30.4°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 September: 24.3°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 September
Mumbai, India

Average humidity in September - Mumbai, India
  • Average humidity in September: 83%

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 September
Mumbai, India

Average rainfall in September - Mumbai, India
  • Average rainfall in September: 312.3mm

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 September
Mumbai, India

Average rainfall days in September - Mumbai, India
  • Average rainfall days in September: 14.4 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 September
Mumbai, India

Average sea temperature in September - Mumbai, India
  • Average sea temperature in September: 28.7°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 September /
Average sunshine in September
Mumbai, India

Average daylight in September / Average sunshine in September - Mumbai, India
  • Average daylight in September: 12.2h

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 September: 5.5h

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 September
Mumbai, India

Average UV index in September - Mumbai, India
  • Average UV index in September: 12

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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