September weather forecast
Sylhet, Bangladesh

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Weather in September

Entering September, the city of Sylhet experiences a slow yet discernible shift from the monsoon season. The monsoon effects remain, but temperatures and rainfall start to decline, marking the onset of post-monsoon conditions. Rainfall picks at 254mm (10") recorded over 28.5 days, representing a slight decrease compared to August. The decrease in rain, in addition to the dwindling cloud cover, signifies a transition period away from the monsoon months moving towards a drier season. The tropical wet and dry climate of Sylhet draws to a close as the post-monsoon period of September signals the arrival of autumn.

Temperature

Sylhet experiences an average high-temperature of a still tropical 31.5°C (88.7°F) in September, marking an insignificant shift from 31.6°C (88.9°F) in August. Nighttime temperatures in Sylhet consistently average a moderately hot 24.4°C (75.9°F) during September.

Heat index

The heat index in September is estimated at a burning hot 46°C (114.8°F). Take caution: Heat exhaustion and heat cramps are probable. Heatstroke may be imminent with ongoing effort.
One should consider that heat index numbers are for shaded settings and light wind. With direct sunlight, the heat index could increase by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'apparent temperature', gives a temperature feeling by integrating air temperature and humidity. This effect is subjective, differing among individuals based on their physical activity and perception of heat, which can be influenced by factors like wind, clothing, and metabolic variances. When in direct sunlight, one should be cautious as it can raise the heat index by as much as 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Children often miss understanding the importance of rest and rehydration. Thirst usually appears late during dehydration - therefore, maintaining hydration, particularly during long physical activities, is essential.
The innate cooling system of the human body revolves around perspiration, with the evaporation of sweat being central to this process. With higher relative humidity, the rate of evaporation is reduced, resulting in increased heat retention in the body compared to drier air. When heat gain exceeds the level the body can remove, body temperature begins to rise, and heat-related illnesses and disorders may develop.

Humidity

The average relative humidity in September is 88%.

Rainfall

In Sylhet, during September, the rain falls for 28.5 days and regularly aggregates up to 254mm (10") of precipitation. Throughout the year, there are 208.1 rainfall days, and 1868mm (73.54") of precipitation is accumulated.

Daylight

In September, the average length of the day is 12h and 18min.
On the first day of the month, sunrise is at 5:33 am and sunset at 6:11 pm. On the last day of September, sunrise is at 5:44 am and sunset at 5:40 pm +06.

Sunshine

In Sylhet, the average sunshine in September is 7.3h.

UV index

April and September, with an average maximum UV index of 7, are months with the highest UV index in Sylhet. A UV Index estimate of 6 to 7 represents a high health vulnerability from unsafe exposure to UV radiation for the average person.
Note: In September, a daily maximum UV index of 7 leads to the following instructions:
Escape overexposure. People with light skin may incur burns in fewer than 20 minutes. It's important to stay in the shade and limit exposure to the sun from 10 a.m. to 4 p.m., when UV radiation is most intense, although remember that shade structures may not provide full sun protection. Boost your sun resistance with garments that are densely woven yet spacious.
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Frequently asked questions

How hot is it in Sylhet in September?

The high-temperature during September is 31.5°C (88.7°F) and the low-temperature is 24.4°C (75.9°F). In September, the average heat index (a.k.a. 'real feel', 'felt air temperature'), which calculates the temperature value influenced by the moisture in the air, is estimated at 46°C (114.8°F).

What is the average humidity in September in Sylhet?

In September, the average relative humidity in Sylhet is 88%.

How much does it rain in Sylhet in September?

In Sylhet, Bangladesh, in September, it is raining for 28.5 days, with typically 254mm (10") of accumulated precipitation.

How many hours of daylight does Sylhet have in September?

The average day length in September in Sylhet, Bangladesh, is 12h and 18min.

When are sunrise and sunset in September in Sylhet?

On the first day of September in Sylhet, Bangladesh, sunrise is at 5:33 am and sunset at 6:11 pm. On the last day of the month, sunrise is at 5:44 am and sunset at 5:40 pm +06.

How long on average sun shines in September in Sylhet?

In September, the average sunshine duration in Sylhet, Bangladesh, is 7.3h.

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

April and September, with an average maximum UV index of 7, are months with the highest UV index in Sylhet, Bangladesh.

What is the UV index reading in September in Sylhet?

The average daily maximum UV index in September in Sylhet is 7. A UV Index value of 6 to 7 symbolizes a high health vulnerability from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Sylhet, Bangladesh

Average temperature in September - Sylhet, Bangladesh
  • Average high temperature in September: 31.5°C

The warmest month (with the highest average high temperature) is April (34.4°C).
The month with the lowest average high temperature is December (25.5°C).

  • Average low temperature in September: 24.4°C

The month with the highest average low temperature is June (25.3°C).
The coldest month (with the lowest average low temperature) is January (12°C).

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Average pressure in September
Sylhet, Bangladesh

Average pressure in September - Sylhet, Bangladesh
  • Average pressure in September: 1006.1mbar

The month with the highest atmospheric pressure is January (1014.9mbar).
The month with the lowest atmospheric pressure is July (1002mbar).

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Average wind speed in September
Sylhet, Bangladesh

Average wind speed in September - Sylhet, Bangladesh
  • Average wind speed in September: 5.9km/h

The windiest month (with the highest average wind speed) is July (7.7km/h).
The calmest months (with the lowest average wind speed) are November and December (4.3km/h).

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Average humidity in September
Sylhet, Bangladesh

Average humidity in September - Sylhet, Bangladesh
  • Average humidity in September: 88%

The month with the highest relative humidity is July (89%).
The month with the lowest relative humidity is March (55%).

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Average rainfall in September
Sylhet, Bangladesh

Average rainfall in September - Sylhet, Bangladesh
  • Average rainfall in September: 254mm

The wettest month (with the highest rainfall) is June (353mm).
The driest month (with the least rainfall) is January (4mm).

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Average rainfall days in September
Sylhet, Bangladesh

Average rainfall days in September - Sylhet, Bangladesh
  • Average rainfall days in September: 28.5 days

The month with the highest number of rainy days is August (30.2 days).
The month with the least rainy days is January (2.4 days).

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

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

The month with the longest days is June (Average daylight: 13h and 42min).
The month with the shortest days is December (Average daylight: 10h and 36min).

  • Average sunshine in September: 7h and 2min

The month with the most sunshine is April (Average sunshine: 10h and 30min).
The month with the least sunshine is July (Average sunshine: 6h and 54min).

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Average sunshine days in September
Sylhet, Bangladesh

Average sunshine days in September - Sylhet, Bangladesh
  • Average sunshine days in September: 0.8 days

The months with the most sunshine days are January and December (27.6 days).
The month with the least sunshine days is June (0.4 days).

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Average UV index in September
Sylhet, Bangladesh

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

The months with the highest UV index are April and September (UV index 7).
The months with the lowest UV index are January and December (UV index 5).

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Average cloud cover in September
Sylhet, Bangladesh

Average cloud cover in September - Sylhet, Bangladesh
  • Average cloud cover in September: 52

The month with the most cloud cover is July (Cloud cover 62).
The month with the least cloud cover is January (Cloud cover 8).

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Average visibility in September
Sylhet, Bangladesh

Average visibility in September - Sylhet, Bangladesh
  • Average visibility in September: 7km

The months with the highest visibility are January, February, March and December (10km).
The months with the lowest visibility are July, August and September (7km).

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Sylhet, Bangladesh

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