Kolkata
India
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Kolkata, India

The sun rising above the magnificent Victoria Memorial monument and museum in Kolkata, India
The sun rising above the magnificent Victoria Memorial monument and museum in Kolkata, India
September, the last month of the rainy (monsoon) season, in Kolkata, is another tropical month, with average temperature varying between 32.4°C (90.3°F) and 25.8°C (78.4°F).

Temperature

In Kolkata, the average high-temperature is essentially the same as in August - a still hot 32.4°C (90.3°F). In Kolkata, the average low-temperature is 25.8°C (78.4°F).

Heat index

In September, the average heat index is calculated to a life-threatening hot 46.3°C (115.3°F). Be wary - heat exhaustion and heat cramps are highly anticipated. With continued activity, heatstroke is very likely.
Note that heat index values are valued for light wind and location in the shade. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel', 'felt air temperature', 'feels like', or 'apparent temperature', is an index that combines air temperature and relative humidity to determine the human-perceived temperature equivalent. Additional factors like activity, pregnancy, metabolic differences, and differences in body mass, height, and shape 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.
To prevent overheating and help regulate its internal temperature, the human body sweat and rely on the evaporation to cool down. 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 Kolkata, the average relative humidity in September is 81%.

Rainfall

In Kolkata, during September, the rain falls for 15.7 days and regularly aggregates up to 288mm (11.3") of precipitation. In Kolkata, India, during the entire year, the rain falls for 101.5 days and collects up to 1800mm (70.9") of precipitation.

Daylight

In September, the average length of the day is 12.3h.

Sunshine

In September, the average sunshine in Kolkata is 3.9h.

UV index

In September, the average daily maximum UV index in Kolkata is 11. A UV Index value of 11, and more, symbolizes an excessive health risk from unprotected exposure to the Sun's UV rays for average individuals.
Note: In September, the average maximum UV index of 11 translate into the following recommendations:
Take all required precautions, as unprotected skin and eyes can burn in 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. Even on cloudy days, a sunscreen with a minimum 30 sun protection factor should be generously applied and frequently re-applied, including after every swim or outdoor exercise.

What is the temperature in September in Kolkata?

In September, the average high-temperature is 32.4°C (90.3°F), and the average low-temperature is 25.8°C (78.4°F). In September, the average heat index (a.k.a. 'felt air temperature', 'apparent temperature'), that combines air temperature and relative humidity, is appraised at 46.3°C (115.3°F).

What is the average humidity in September in Kolkata?

In Kolkata, the average relative humidity in September is 81%.

How much does it rain in Kolkata in September?

In Kolkata, India, in September, it is raining for 15.7 days, with typically 288mm (11.3") of accumulated precipitation.

How many hours of daylight does Kolkata have in September?

In Kolkata, the average length of the day in September is 12.3h.

How many hours of sunshine does Kolkata have in September?

The average sunshine in September in Kolkata is 3.9h.

How high is the UV index in September in Kolkata?

In Kolkata, the average daily maximum UV index in September is 11. A UV Index value of 11, and more, symbolizes an ultimate hazard to health from unsafe exposure to the Sun's UV rays.
Average temperature in September - Kolkata, India
  • Average high temperature in September: 32.4°C

The warmest month (with the highest average high temperature) is May (35.4°C).
The month with the lowest average high temperature is January (26.4°C).

  • Average low temperature in September: 25.8°C

The month with the highest average low temperature is June (26.5°C).
The coldest month (with the lowest average low temperature) is January (13.8°C).

Average humidity in September - Kolkata, India
  • Average humidity in September: 81%

Months with the highest relative humidity are July and August (83%).
Months with the lowest relative humidity are February and March (58%).

Average rainfall in September - Kolkata, India
  • Average rainfall in September: 288mm

The wettest month (with the highest rainfall) is July (411mm).
The driest month (with the lowest rainfall) is January (11mm).

Average rainfall days in September - Kolkata, India
  • Average rainfall days in September: 15.7 days

The month with the highest number of rainy days is July (20.5 days).
The month with the lowest number of rainy days is December (0.9 days).

Average daylight in September / Average sunshine in September - Kolkata, India
  • Average daylight in September: 12.3h

The month with the longest days is June (Average daylight: 13.5h).
The month with shortest days is December (Average daylight: 10.8h).

  • Average sunshine in September: 3.9h

The month with most sunshine is April (Average sunshine: 7.8h).
The month with least sunshine is July (Average sunshine: 3h).

Average UV index in September - Kolkata, India
  • Average UV index in September: 11

Months with the highest UV index are April, May, June, July and August (UV index 12).
The month with the lowest UV index is December (UV index 6).