September weather forecast
Chittagong, Bangladesh

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.