Last updated: August 21, 2025
September in Sylhet, Bangladesh offers a vibrant blend of weather characteristics that define this lush region. With a maximum temperature reaching 37°C (98°F), it provides a warm atmosphere, while the average temperature settles at a comfortable 28°C (83°F), allowing for pleasant evenings. However, the month is also marked by significant precipitation, with 466 mm (18.3 in) of rainfall spread across 26 days, contributing to the area's rich greenery. The high humidity, averaging around 89%, accentuates the tropical feel, making September a quintessentially wet yet warm month in Sylhet.
In September, Sylhet, Bangladesh, experiences a warm and humid climate, with temperatures ranging from a minimum of 24°C (75°F) to a maximum of 37°C (98°F). The average temperature hovers at a consistent 28°C (83°F), reflective of the lingering summer warmth as the monsoon season gradually transitions. This month marks a notable plateau compared to the previous months, particularly from the scorching heat observed in July and August, yet still holds onto that balmy embrace that characterizes the region. As the rains taper and the weather begins to cool slightly into October, September stands out as a time when the tropical vibrancy of Sylhet thrives, inviting outdoor adventures amidst lush greenery and dramatic skies.
In September, Sylhet experiences a notable transition in its precipitation patterns, receiving 466 mm (18.3 in) of rainfall over the course of 26 days. This substantial amount, while lower than the intense summer months of June and July, still highlights the region's monsoon influence as it prepares to head into the drier months. Comparing September's rainfall to preceding months, the shift from the peak conditions of July, which averaged nearly 895 mm, indicates a gradual tapering of the monsoon rains. However, it remains a significant contributor to the overall annual precipitation, ensuring that the lush landscapes of Sylhet continue to thrive through the changing seasons.
In September, the humidity in Sylhet, Bangladesh remains notably high at 89%, continuing the trend established by the preceding months of July and August, which both hovered around the 90% mark. This spike in humidity during the monsoon season is characteristic of the area, with levels peaking in July and gradually tapering off as the year progresses. While January to April sees a significant drop, with humidity levels plummeting to as low as 47% in April, the return of the rain in May brings a sharp increase back to 79%. As the year transitions into the drier months of October and November, humidity levels stabilize around 89%, creating a relatively consistent atmosphere before descending again in December. This pattern highlights Sylhet’s humid subtropical climate, where moisture levels can dramatically influence daily life and weather experiences.
In September, Sylhet, Bangladesh experiences an extreme UV Index of 13, which indicates a significant risk of harm from unprotected sun exposure. This intensity reflects a consistent trend seen throughout the summer months, where the UV Index remains in the extreme category, peaking at 14 in July. With a burn time of just 10 minutes, residents and visitors alike should be particularly vigilant about sun protection practices during this time. Post-September, the UV Index begins to decrease, dropping to a still high level of 10 in October, suggesting a gradual transition into safer sun exposure conditions. For those looking to understand how to stay safe under the sun, refer to Sylhet UV Index.
UV Risk Categories
September in Sylhet, Bangladesh, brings a gentle resurgence of sunshine after the sultry summer months, with an impressive 262 hours of sunlight illuminating the landscape. Following a dip in July and August, where cloud cover reigned, September marks a gradual recovery as the days become pleasantly brighter. This month stands out as a bridge between the sweltering heat of summer and the cool embrace of autumn, setting the stage for invigorating outdoor activities amidst lush greenery. The overall trend reflects a consistent ebb and flow of sunlight throughout the year, but September's balance of warmth and light feels particularly inviting, hinting at the beauty that lies ahead as the seasons shift.
In Sylhet, Bangladesh, the likelihood of sunny weather fluctuates significantly throughout the year. After enjoying high chances of sunshine in the earlier months, with January and February boasting 87% and 85%, respectively, the sun's presence begins to wane as spring transitions into the rainy season. By September, the chances of sunshine drop to a modest 19%, marking a period where monsoon rains dominate the landscape. This pattern of reduced sunlight persists into the heart of the rainy season, with July and August seeing a stark decline to just 4% and 5%. However, as September closes and October approaches, the potential for sun starts to rise again, reaching 58%, hinting at a gradual shift towards clearer skies. Overall, while September isn’t the sunniest month in Sylhet, it plays a crucial role in the transition towards more favorable weather as the seasons change.
In September, Sylhet, Bangladesh experiences a balanced 12 hours of daylight, continuing the trend established in the previous months of April through August, where daylight reached its peak at 13 hours in the warmer months. As the city transitions into the fall, this gradual tapering of daylight reflects the shifting seasons, leading to shorter days ahead with October bringing a slight decrease to 11 hours. The consistent daylight duration during September symbolizes a harmonious blend of the summer's warmth and the impending arrival of autumn, making it a particularly enchanting time in this lush landscape.
As the year transitions into September in Sylhet, Bangladesh, the average wind speed subtly reflects the changing season, dipping slightly to 1.3 m/s (3 mph). This gentle breeze marks the tail end of the monsoon season, where a consistent pattern emerges: from January through August, the wind speed hovers around a modest 1.4 to 1.8 m/s. Interestingly, after peaking in March, the winds gradually mellow in the subsequent months, leading to September's calmer atmosphere. This slight reduction in wind speed invites a serene backdrop as the lush landscape prepares for the transition into autumn, creating a tranquil experience that highlights the region's natural beauty.
Weather in Sylhet varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Sylhet, focusing on differences in temperature, rainfall, humidity, and UV levels.
In September, the weather is characterized by hot temperatures with a minimum of 24°C (75°F) and an average of 28°C (83°F), peaking at a sweltering 37°C (98°F). This month is also marked by significant rainfall, with 466 mm (18.3 in) of precipitation over 26 days, and high humidity at 89%. In stark contrast, January presents a much cooler climate, featuring a minimum temperature of 6°C (44°F) and an average of 17°C (63°F), reaching a maximum of 29°C (84°F). Rainfall is minimal, with only 6 mm (0.2 in) over just 1 day, and humidity drops to 76%. For a detailed look at January's weather, you can visit Sylhet weather in January.
September and February showcase a striking contrast in weather patterns. In September, temperatures range from a minimum of 24°C (75°F) to a scorching maximum of 37°C (98°F), with an average of 28°C (83°F). This month is characterized by heavy rainfall, receiving 466 mm (18.3 in) of precipitation over 26 days, accompanied by high humidity levels at 89%. In contrast, February presents much cooler conditions, with a minimum of 9°C (49°F) and a maximum of 30°C (86°F), averaging 19°C (67°F). Precipitation drops significantly to just 28 mm (1.1 in) over 3 days, and humidity decreases to 69%. For further details, you can check out Sylhet weather in February.
In September, the weather is characterized by warm to hot temperatures, with daily averages around 28°C (83°F) and maximums reaching up to 37°C (98°F). The month also experiences heavy rainfall, averaging 466 mm (18.3 in) over 26 days, coupled with high humidity levels of 89%. In contrast, March offers a much cooler climate, featuring a minimum temperature of 12°C (54°F) and an average of 23°C (74°F), with maximum temperatures peaking at 34°C (93°F). Precipitation in March is significantly lower, with only 117 mm (4.6 in) falling over just 9 days, and humidity at a more comfortable 53%. For further details on weather patterns specific to March, you can refer to Sylhet weather in March.
September and April exhibit contrasting weather patterns. September is characterized by higher temperatures, with minimums around 24°C (75°F) and maximums reaching up to 37°C (98°F), accompanied by high humidity at 89%. Rainfall is abundant as well, with 466 mm (18.3 in) falling over 26 days. In contrast, April offers a milder climate, with temperatures ranging from a minimum of 17°C (63°F) to a maximum of 35°C (96°F), and significantly lower humidity at 47%. Although April sees slightly more precipitation at 503 mm (19.8 in), it only occurs over 19 days. For more detailed information, you can refer to Sylhet weather in April.
September and May both feature warm temperatures, but September tends to be slightly hotter on average with a typical range of 24°C (75°F) to 37°C (98°F), compared to May’s range of 20°C (68°F) to 36°C (98°F). Despite these high temperatures, both months see significant rainfall, with September receiving 466 mm (18.3 in) over 26 days and May experiencing a bit more precipitation at 520 mm (20.5 in) spread across 27 days. Additionally, humidity levels are notably higher in September at 89%, while May has a more comfortable humidity level at 79%. For a detailed look at May's weather, check out Sylhet weather in May.
In comparing the weather of September and June, we observe notable differences, particularly in precipitation and temperature patterns. September experiences slightly warmer temperatures, with a minimum of 24°C (75°F) and a maximum of 37°C (98°F), while June sees a maximum of 35°C (96°F) and a minimum of 23°C (73°F). Despite having similar average temperatures, September has significant rainfall, totaling 466 mm (18.3 in) over 26 days, whereas June is considerably wetter with 816 mm (32.1 in) of precipitation across 29 days. Both months maintain high humidity, with September at 89% and June at 86%. For more information on the specifics of June weather conditions, check out Sylhet weather in June.
In comparing the weather between September and July, both months share similar average temperatures, hovering around 28°C (83°F). However, September experiences slightly higher minimum temperatures, averaging 24°C (75°F) compared to July's 23°C (73°F). Notably, July sees significantly more rainfall, with 895 mm (35.2 in) falling over 30 days, whereas September receives 466 mm (18.3 in) of precipitation across 26 days. Humidity levels are also a tad higher in July at 91%, compared to September's 89%. For more insights into July's climate, you can check Sylhet weather in July.
In comparing the weather of September and August, both months exhibit similar temperature ranges, with September showing a minimum of 24°C (75°F) and an average of 28°C (83°F), while August boasts a slightly higher minimum of 25°C (76°F) and the same average. However, August experiences significantly more rainfall, totaling 749 mm (29.5 in) over 30 days compared to September's 466 mm (18.3 in) across 26 days. Humidity levels are consistent, with September at 89% and August slightly higher at 90%. For a detailed look at August weather patterns, visit Sylhet weather in August.
September and October exhibit significant differences in their weather patterns. September tends to be hotter, with temperatures ranging from a minimum of 24°C (75°F) to a maximum of 37°C (98°F), while October cools down slightly, boasting a minimum of 18°C (64°F) and a maximum of 36°C (98°F). Additionally, September is characterized by heavy rainfall, receiving 466 mm (18.3 in) over 26 days, compared to October's more moderate precipitation of 247 mm (9.7 in) over 16 days. Both months share high humidity levels at 89%, but the overall weather in October is generally more pleasant and less oppressive. For more detailed insights, you can visit Sylhet weather in October.
September and November present striking contrasts in weather patterns. In September, temperatures soar with a minimum of 24°C (75°F) and often peaking at a sweltering 37°C (98°F), while the month is marked by significant rainfall, totaling 466 mm (18.3 in) over 26 days, leading to high humidity levels of 89%. In contrast, November offers a much cooler climate, with lows of 14°C (57°F) and highs reaching 32°C (89°F), along with a dramatic reduction in rain to just 20 mm (0.8 in) across 3 days, maintaining humidity at a similar level of 88%. This transition showcases the shift from the heavy monsoon conditions of September to the more temperate weather of November. For more details, visit Sylhet weather in November.
September and December display stark contrasts in weather conditions. In September, temperatures soar with a minimum of 24°C (75°F) and a maximum reaching up to 37°C (98°F), while the month is marked by heavy rainfall, receiving an impressive 466 mm (18.3 in) over 26 days, coupled with high humidity levels of 89%. In contrast, December offers a much cooler climate with temperatures ranging from a comfortable 10°C (50°F) at night to a pleasant maximum of 29°C (85°F) during the day. Rainfall dramatically decreases to just 40 mm (1.6 in) over two days, and humidity slightly lowers to 86%. For more details on the weather during this month, visit Sylhet weather in December.
September in Sylhet stands out with its high humidity and persistent rainfall, making it one of the wettest months of the year. Unlike the drier summer months, the air is thick with moisture, often leading to a feeling of stickiness throughout the day. While temperatures can peak around 37°C, the average remains a comfortable 28°C, providing a warm yet humid environment. With more than half the month seeing precipitation, it's a time when the lush green landscape flourishes, offering a vibrant contrast to the preceding drier months. For a deeper dive into the climatic trends of Sylhet throughout the year, visit Sylhet Climate.