September weather forecast
Chittagong, Bangladesh

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Weather in September

Between August and September in Chittagong, the monsoon gradually recedes, leading to a subtle shift in the weather pattern. The amount of rainfall starts declining, and the thick cloud cover slowly begins to give way to clearer skies. The city starts experiencing extended daylight hours, indicating a transition from the monsoon-dominated season to the cooler months. The month of September experiences temperatures from 25.6°C (78.1°F) to 30.1°C (86.2°F) accompanied by a lessened 201mm (7.91") rainfall. Thus, the Chittagong weather in September is a testament to the onset of post-monsoon period, featuring a relatively tranquil atmosphere compared to the previous stormy months.

Temperature

September's advent presents an average high-temperature of a tropical 30.1°C (86.2°F), indicating a slight variation from the conditions of the previous month. A mean low-temperature of 25.6°C (78.1°F) is a distinguishing feature of September, indicating a slight dip from daytime highs.

Heat index

September's average heat index is evaluated at a very hot 39°C (102.2°F). Exercise special caution, heat exhaustion and heat cramps are probable. Prolonged activity may induce heatstroke.
Heat index determinations are made taking into account the shade and light air movements. Heat index values might soar by up to 15 Fahrenheit (8 Celsius) degrees with exposure to direct sunshine.
Note: The heat index, also known as 'feels like' or 'apparent temperature', shows a temperature sensation when both heat and moisture conditions are combined. One's perception of weather can be shaped by other factors, involving metabolic differences, pregnancy, and physical exertion. Do note, being directly under sun rays can amplify the heat you feel, potentially raising the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are essentially critical for children. Youngsters often neglect the necessity for rest and hydration. Thirst is a sign of advancing dehydration - thus the importance of maintaining hydration, specifically during long-lasting physical activities.
Perspiration is the body's default response to elevated temperatures, as it promotes the evaporation of sweat to achieve cooling. When there is abundant moisture in the air, the body's cooling through the evaporation process becomes less effective, leading to the sensation of overheating. When the body is unable to balance heat gain, its temperature elevates, which may induce thermal illnesses.

Humidity

In September, the average relative humidity is 85%.

Rainfall

In Chittagong, Bangladesh, in September, it is raining for 27.8 days, with typically 201mm (7.91") of accumulated precipitation. Throughout the year, in Chittagong, there are 183.8 rainfall days, and 1579mm (62.17") of precipitation is accumulated.

Sea temperature

In September, the average sea temperature is 29.1°C (84.4°F).
Note: Water temperature ranging between 25°C (77°F) and 29°C (84.2°F) is considered very warm and pleasing for everyone. It allows for enjoyable water activities over extended periods without discomfort.

Daylight

The average length of the day in September in Chittagong, Bangladesh, is 12h and 17min.
On the first day of the month, sunrise is at 5:35 am and sunset at 6:09 pm. On the last day of September, sunrise is at 5:43 am and sunset at 5:41 pm +06.

Sunshine

In September, the average sunshine is 8.4h.

UV index

The months with the highest UV index are March through June and September, with an average maximum UV index of 7. A UV Index estimate of 6 to 7 represents a high health hazard from exposure to the Sun's UV rays for the ordinary person.
Note: The UV index of 7 during September leads to these advisories:
Persist with safeguards and heed sun safety doctrines. Keeping sunburn at bay is of prime importance. The Sun emits the most powerful UV radiation between 10 a.m. and 4 p.m. Try to avoid direct sunlight during this period. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim. Alert! Sand and water increase UV exposure due to their reflective properties.

Frequently asked questions

How hot does it get in Chittagong in September?

An average high-temperature, in September, in Chittagong, is 30.1°C (86.2°F) and the average low-temperature is 25.6°C (78.1°F). The average heat index (a.k.a. 'real feel', 'feels like'), which combines air temperature and relative humidity, in September is evaluated at 39°C (102.2°F).

What is the average humidity in September in Chittagong?

The average relative humidity in September in Chittagong is 85%.

How much does it rain in Chittagong in September?

In Chittagong, in September, during 27.8 rainfall days, 201mm (7.91") of precipitation is typically accumulated.

How warm is the water in September in Chittagong?

In Chittagong, Bangladesh, in September, the average water temperature is 29.1°C (84.4°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 Chittagong?

The average day length in September is 12h and 17min.

When is the sunrise / sunset in September in Chittagong?

In September, on the first day of the month, sunrise is at 5:35 am and sunset at 6:09 pm. On the last day of the month, sunrise is at 5:43 am and sunset at 5:41 pm +06.

How long on average sun shines in September in Chittagong?

In Chittagong, the average sunshine duration in September is 8.4h.

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

The months with the highest UV index in Chittagong are March through June and September, with an average maximum UV index of 7.

What is the UV index intensity in September in Chittagong?

The average daily maximum UV index in September in Chittagong, Bangladesh, is 7. A UV Index estimate of 6 to 7 represents a high health risk from exposure to Sun's UV rays.

Average temperature in September
Chittagong, Bangladesh

Average temperature in September - Chittagong, Bangladesh
  • Average high temperature in September: 30.1°C

The warmest month (with the highest average high temperature) is April (32°C).
The month with the lowest average high temperature is January (24.6°C).

  • Average low temperature in September: 25.6°C

The month with the highest average low temperature is June (26.8°C).
The coldest month (with the lowest average low temperature) is January (15.8°C).

Average pressure in September
Chittagong, Bangladesh

Average pressure in September - Chittagong, Bangladesh
  • Average pressure in September: 1006.7mbar

The month with the highest atmospheric pressure is January (1014.7mbar).
The month with the lowest atmospheric pressure is July (1002.8mbar).

Average wind speed in September
Chittagong, Bangladesh

Average wind speed in September - Chittagong, Bangladesh
  • Average wind speed in September: 12.2km/h

The windiest month (with the highest average wind speed) is July (17.7km/h).
The calmest month (with the lowest average wind speed) is October (8.8km/h).

Average humidity in September
Chittagong, Bangladesh

Average humidity in September - Chittagong, Bangladesh
  • Average humidity in September: 85%

The months with the highest relative humidity are July and August (86%).
The month with the lowest relative humidity is February (62%).

Average rainfall in September
Chittagong, Bangladesh

Average rainfall in September - Chittagong, Bangladesh
  • Average rainfall in September: 201mm

The wettest month (with the highest rainfall) is July (414mm).
The driest month (with the least rainfall) is December (3mm).

Average rainfall days in September
Chittagong, Bangladesh

Average rainfall days in September - Chittagong, Bangladesh
  • Average rainfall days in September: 27.8 days

The month with the highest number of rainy days is August (30.3 days).
The month with the least rainy days is February (1.6 days).

Average sea temperature in September
Chittagong, Bangladesh

Average sea temperature in September - Chittagong, Bangladesh
  • Average sea temperature in September: 29.1°C

The best month for swimming (with the highest average sea temperature) is June (29.7°C).
The coldest month (with the lowest average sea temperature) is January (21.8°C).

Average daylight in September /
Average sunshine in September
Chittagong, Bangladesh

Average daylight in September / Average sunshine in September - Chittagong, Bangladesh
  • Average daylight in September: 12h and 2min

The month with the longest days is June (Average daylight: 13h and 30min).
The month with the shortest days is December (Average daylight: 10h and 48min).

  • Average sunshine in September: 8h and 2min

The month with the most sunshine is April (Average sunshine: 11h and 6min).
The months with the least sunshine are July and December (Average sunshine: 7h and 30min).

Average sunshine days in September
Chittagong, Bangladesh

Average sunshine days in September - Chittagong, Bangladesh
  • Average sunshine days in September: 1.4 days

The month with the most sunshine days is January (29.2 days).
The month with the least sunshine days is August (0.3 days).

Average UV index in September
Chittagong, Bangladesh

Average UV index in September - Chittagong, Bangladesh
  • Average UV index in September: 7

The months with the highest UV index are March, April, May, June and September (UV index 7).
The month with the lowest UV index is January (UV index 5).

Average cloud cover in September
Chittagong, Bangladesh

Average cloud cover in September - Chittagong, Bangladesh
  • Average cloud cover in September: 44

The month with the most cloud cover is July (Cloud cover 58).
The month with the least cloud cover is January (Cloud cover 5).

Average visibility in September
Chittagong, Bangladesh

Average visibility in September - Chittagong, Bangladesh
  • Average visibility in September: 9km

The months with the highest visibility are January, February, March, April, May, October, November and December (10km).
The months with the lowest visibility are June, July, August and September (9km).

Chittagong, Bangladesh

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