Sylhet Weather in September
September in Sylhet brings very high temperatures, with daytime highs of 33°C (91°F) and nights around 25°C (77°F). It's part of the rainy season, with 506 mm (20 in) of rainfall on average, so an umbrella or poncho is a good idea.
Rainfall in Sylhet in September
As part of the rainy season, Sylhet sees around 12 days of rain in September, with an average of 506 mm (20 in). Showers during the rainy season tend to be heavy and can come down intensely. An umbrella is often not enough, so a poncho or waterproof jacket is a better choice.
Temperature in Sylhet in September
Temperatures in Sylhet in September top out at 33°C (91°F) and drop to 25°C (77°F) overnight. It's usually most comfortable outside during the morning and later in the day. At 25°C (77°F) overnight, it stays warm after dark. Light, breathable clothing and good airflow in your room make a noticeable difference.September in Sylhet can still be great, but if you prefer pleasant temperatures along with dry and sunny conditions, our weather planner can help you explore other options in the world.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Bangladesh, check out our Sylhet's climate page.
Sylhet Temperature in September
Min Temperature
25°C (77°F)
Max Temperature
33°C (91°F)
Chance of Rain
40%
Precipitation
506 mm (20 in)
Rainy days
12 days
Daily Historical Temperatures
43-year average (1977-2025)
Based on our historical records, temperatures in Sylhet typically stay consistent throughout September, with daily highs averaging around 33°C (91°F). Nights are warm, with lows around 25°C (77°F).
Average temperatures in September
Historical weather for Sylhet in September
Browse day-by-day weather records for Sylhet spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Sylhet historical weather extremes in September
The extremes listed below come from historical weather data collected in Sylhet from 2005 through 2025.
- The warmest day in September was on September 20, 2024, with a maximum of 37°C (99°F).
- On September 9, 2007, Sylhet saw its coldest September day with temperatures maxing out at 25°C (77°F).
- The coldest night in September in Sylhet was on September 22, 2018, with a minimum of 17°C (63°F).
Best Places in Bangladesh in September
Find out more about the weather in Bangladesh and which places have the best travel conditions in this month. See all of Bangladesh in September →
perfect weather
pleasant
tolerable
unpleasant
poor
What to Wear in Sylhet in September
Warm temperatures in September make for comfortable sightseeing weather. Pack breathable fabrics like cotton shirts, knee-length shorts or skirts, and comfortable walking shoes. A thin long sleeve for indoor spaces is handy. Heavy rain is guaranteed, please bring a good poncho and waterproof everything!What To Do in Sylhet in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Bangladesh, check out our Sylhet's climate page.
See the full Sylhet climate overview or explore weather in Bangladesh.
