September weather forecast
Dhaka, Bangladesh

The weather in September brings Dhaka's summer to a close, and it is the month that ushers in the Autumn season. The city continues to be humid but at slightly lower levels as compared to August. Dhaka receives a significant amount of rainfall in the month, averaging at 86mm. Wind speeds exhibit a down trend, with wind speeds ranging from 9.8km/h to 14.4km/h on gusty days. Despite a slight drop in temperatures from those in August, September's lowest temperature of 25.7°C added to humidity results in a high heat index.

Temperature

The transition into September in Dhaka shows a subtle variation to a still tropical 32.4°C from August's 32.6°C in the average high-temperature. Dhaka's average low-temperature is measured at a moderately hot 25.7°C during September.

Heat index

The heat index in September is computed to be a life-threatening hot 46°C. Attention: Heat exhaustion and heat cramps are anticipated. Prolonged effort can result in heatstroke.
It is important to note that the heat index values are for shaded areas and light wind scenarios. The heat index can potentially augment by 15 Fahrenheit (8 Celsius) degrees due to direct sunlight.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', evaluates the perceived heat by adding the effect of moisture in the air. The perception of temperature can be subjective, varying based on activity and individual heat sensitivity, influenced by factors like wind, attire, and metabolic variations. Direct sun rays can make one feel hotter, potentially raising the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Young ones often underestimate the need for rest and rehydration. Thirst appears late in dehydration - hence, it is important to keep hydrated, particularly during prolonged physical activities.
The body's inherent cooling system operates through perspiration, wherein evaporating sweat offsets excessive heat. Under high air temperature and high humidity (high heat index) conditions, the body's ability to perspire is compromised, increasing the sensation of heat. Excessive heat that's not properly managed leads to increased body temperatures and resultant health issues.

Humidity

In September, the average relative humidity in Dhaka, Bangladesh, is 80%.

Rainfall

In Dhaka, during September, the rain falls for 20.5 days and regularly aggregates up to 86mm of precipitation. Throughout the year, in Dhaka, there are 152.3 rainfall days, and 741mm of precipitation is accumulated.

Daylight

The average length of the day in September in Dhaka is 12h and 17min.
On the first day of September in Dhaka, sunrise is at 5:39 am and sunset at 6:17 pm. On the last day of the month, sunrise is at 5:49 am and sunset at 5:47 pm +06.

Sunshine

In Dhaka, the average sunshine in September is 8.2h.

UV index

The months with the highest UV index in Dhaka are March through September, with an average maximum UV index of 7. A UV Index value of 6 to 7 symbolizes a high threat to health from exposure to the Sun's UV rays for the average person.
Note: In September, the maximum UV index of 7 suggests these recommendations:
Undertake protective measures and comply with sun safety rules. Shielding against skin and eye damage is essential. Minimize exposure to direct sunlight and seek shade from 10 a.m. to 4 p.m., when UV radiation is most intense, but remember that shade structures may not offer complete protection. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure.