Last updated: August 21, 2025
September in Chattogram, Bangladesh, is characterized by warm temperatures and significant rainfall. The average temperature hovers around 28°C (83°F), with highs reaching up to 32°C (90°F) and lows dipping to about 26°C (79°F). This month sees an impressive 326 mm (12.8 in) of precipitation, spread over 25 days, making it one of the wetter times of the year. With an average humidity level of 82%, the atmosphere feels quite tropical, creating a lush environment that is typical for this coastal city during the monsoon season.
In September, Chattogram, Bangladesh, experiences a subtle shift in temperatures, as the monsoon season begins to wane. With minimum temperatures settling at 26°C (79°F) and averages hovering around 28°C (83°F), the climate remains warm and humid, inviting outdoor exploration. The maximum highs can reach up to 32°C (90°F), offering brighter sunny days perfect for local activities. As the month unfolds, this consistent warmth, combined with the lingering moisture from the rainy season, creates a lush environment that showcases the city’s vibrant greenery, making it an ideal time for nature enthusiasts to visit. Overall, September serves as a bridge between the intense heat of summer and the milder, drier months to come.
September in Chattogram, Bangladesh, marks a significant transition in the monsoon season, as the city receives a substantial 326 mm (12.8 in) of rainfall over 25 days. This considerable precipitation follows the peak months of July and August, which often see even heavier downpours, with July alone averaging a staggering 707 mm (27.8 in). However, September's rainfall, while lower than the preceding months, still contributes to the region's lush landscape and vital water resources. The gradual decrease in precipitation from the torrential summer rains suggests a shift towards drier months ahead, with October and November expected to show a further decline in rainfall. This trend highlights the dynamic weather patterns characteristic of Chattogram, where the monsoon plays a crucial role in the local climate and ecosystem.
In September, Chattogram experiences a notable spike in humidity, reaching 82%, making it one of the most humid months of the year. This increase is part of a broader trend that begins in early summer, where humidity steadily climbs from 41% in March to July’s peak of 81%. The transition into September marks the culmination of this humid season, as the region braces for the wet monsoon conditions that characterize the later months. As the temperatures begin to drop in October, humidity levels slightly recede, settling at 78%, yet they remain significantly high compared to the drier winter months. This pattern highlights the tropical climate's characteristic humidity, influencing both the environment and lifestyle in this vibrant coastal city.
In September, Chattogram experiences a UV Index of 12, indicating an extreme exposure category, with a burn time of just 10 minutes. This month continues the trend of high UV levels seen throughout the summer, where the index peaked at 13 in both July and August. As the monsoon season wanes and the days remain sunny, the risk of overexposure remains significant. It's essential for residents and visitors to prioritize sun safety practices during this period. For more information on protecting yourself from harmful UV rays, explore the comprehensive data at Chattogram UV Index.
UV Risk Categories
As September arrives in Chattogram, Bangladesh, the city enjoys a delightful blend of warmth and light with 281 sunshine hours, marking a slight dip from the vibrant summer months of May and June. This period follows a trend of gradual increase in sun exposure, peaking in May with 345 hours, before seeing a gentle decline as the monsoon season draws to a close. Despite the modest fall in daylight, September still proudly boasts more sun than the preceding months of July and August, reinforcing the city's profile as a sun-soaked destination. As temperatures cool and the skies clear, September offers a charming respite, inviting residents and visitors alike to bask in the lingering glow of the season while anticipating the crispness of autumn.
In Chattogram, Bangladesh, the likelihood of sunny weather takes a notable dip as summer transitions into the monsoon season. September typically sees only a 16% chance of sunshine, which is starkly different from the preceding months. This drop follows an already diminished sunshine pattern from August's 8%, marking a significant contrast to the sun-drenched January and February, where the chances peak at 92% and 87%, respectively. Although the weather begins to improve again in October with a 45% likelihood of clear skies, September is characterized by its overcast conditions, making it one of the cloudiest months of the year.
In Chattogram, Bangladesh, the month of September offers a balanced daylight duration, providing about 12 hours of sunlight each day. This amounts to a delightful transition as the long, sunlit days of summer gradually give way to the softer, shorter days of autumn. Notably, the daylight remains constant at 12 hours from April to September, suggesting a peak in brightness around this period, before tapering off into October's 11 hours. The trend of increasing daylight from the beginning of the year peaks in May and June, showcasing how the vibrant summer days lead to a gradual yet noticeable shift as the year progresses. As such, September stands as a harmonious bridge, linking the exuberance of summer with the gentler tones of fall.
As September rolls into Chattogram, the average wind speed settles at 3.8 m/s (8 mph), reflecting a gentle breeze that hints at the transition from the bustling monsoon to the drier months ahead. This month's wind conditions echo the patterns observed in spring, where speeds hovered around similar levels, providing a comforting continuity. After the height of the rainy season in June and July, which boasted noticeable gusts of 5.8 m/s (13 mph) and 5.6 m/s (13 mph) respectively, September's winds offer a reprieve, ushering in a more tranquil atmosphere. With speeds tapering off further in October to 2.8 m/s (6 mph), this gentle wind serves as a reminder of nature's cyclical rhythm, paving the way for the calmness of the later months.
Weather in Chattogram varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Chattogram, focusing on differences in temperature, rainfall, humidity, and UV levels.
The weather in September is characterized by warmth and high humidity, with average temperatures ranging from 26°C (79°F) to 32°C (90°F) and frequent rainfall, totaling 326 mm (12.8 in) over 25 days. In contrast, January presents a much cooler climate, with temperatures varying from a minimum of 15°C (60°F) to a maximum of 27°C (81°F). This month sees significantly less precipitation, only 6 mm (0.3 in) falling over just one day, and a lower humidity level of 57%. For more detailed information, you can check Chattogram weather in January.
September and February present strikingly different weather patterns. In September, temperatures range from a minimum of 26°C (79°F) to a maximum of 32°C (90°F), with an average of 28°C (83°F). The month is characterized by high humidity at 82% and significant rainfall, with 326 mm (12.8 in) of precipitation spread over 25 days. In stark contrast, February offers much cooler conditions, with temperatures ranging from a minimum of 15°C (59°F) to a maximum of 28°C (82°F) and an average of 22°C (72°F). The humidity drops to 50%, and the month is virtually dry, receiving only 4 mm (0.1 in) of rain over just 1 day. For more detailed information on February weather specifics, visit the following link: Chattogram weather in February.
September weather is characterized by high temperatures, with a minimum of 26°C (79°F) and an average of 28°C (83°F), peaking at 32°C (90°F). This month also experiences significant rainfall, totaling 326 mm (12.8 in) over 25 days, coupled with high humidity levels at 82%. In contrast, March presents a more moderate climate, featuring lower temperatures that range from a minimum of 19°C (66°F) to an average of 26°C (78°F), with a maximum of 32°C (91°F). Precipitation in March is sparse, averaging only 35 mm (1.4 in) over just 3 days, and the humidity drops significantly to 41%. For a detailed look at March weather in Chattogram, visit Chattogram weather in March.
In September, the weather is characterized by a warmer overall climate with average temperatures ranging from a minimum of 26°C (79°F) to a maximum of 32°C (90°F). This month sees significant rainfall, with precipitation totaling 326 mm (12.8 in) over 25 days, contributing to a high humidity level of 82%. In contrast, April features slightly cooler minimum temperatures at 22°C (72°F) and peaks at a maximum of 33°C (92°F), with the same average temperature of 28°C (83°F). However, April experiences much less rainfall, with only 71 mm (2.8 in) over just 8 days and a significantly lower humidity level of 45%. For a detailed look at the weather in April, you can visit Chattogram weather in April.
September and May present contrasting weather patterns, with September typically being hotter and more humid. September sees average temperatures ranging from a minimum of 26°C (79°F) to a high of 32°C (90°F), while May's temperatures range slightly less, with a minimum of 24°C (75°F) and a maximum of 33°C (92°F). However, September is marked by significantly higher rainfall, receiving 326 mm (12.8 in) over 25 days compared to May's 139 mm (5.5 in) across 16 days. Additionally, September maintains a higher humidity level at 82%, in contrast to May's 69%. For more details on weather conditions in May, you can check the link: Chattogram weather in May.
In comparing the weather of September and June, both months exhibit similar minimum and average temperatures, hovering around 26°C (79°F) and 28°C (83°F), respectively. However, June typically experiences slightly cooler maximum temperatures at 31°C (89°F) compared to September's peak of 32°C (90°F). Precipitation levels, on the other hand, show a significant contrast; September receives 326 mm (12.8 in) of rain over 25 days, while June has much heavier rainfall at 642 mm (25.3 in) over 27 days. This results in a more humid atmosphere in September, with humidity levels at 82% compared to June's 72%. For a more detailed look at June's weather, you can visit Chattogram weather in June.
In comparing the weather of September and July, we can observe that both months have similar average temperatures, with September's average at 28°C (83°F) and July's at 28°C (82°F). However, September experiences slightly higher maximum temperatures, peaking at 32°C (90°F) compared to July's maximum of 31°C (88°F). One notable difference between the two months is the precipitation; September sees 326 mm (12.8 in) over 25 rainy days, while July is significantly wetter, with 707 mm (27.8 in) over 30 days. Humidity levels are comparable, with September at 82% and July at 81%. For more details on July's weather, you can visit Chattogram weather in July.
In comparing the weather of September and August, we see some similarities and notable differences. Both months maintain a consistent temperature range, with minimums around 26°C (79°F) and average highs reaching 28°C (83°F). However, September experiences slightly warmer maximum temperatures, peaking at 32°C (90°F) compared to August's 31°C (88°F).
On the precipitation front, September is significantly wetter, receiving 326 mm (12.8 in) over 25 days, while August saw 446 mm (17.5 in) spread across 29 days. This indicates that although August has higher total rainfall, September still presents a considerable amount of rain over fewer days. Additionally, September's humidity is slightly higher at 82% compared to August's 78%. For more detailed information about August weather specifically, you can check Chattogram weather in August.
In September, the weather is notably warmer with a minimum temperature of 26°C (79°F) and an average of 28°C (83°F), peaking at 32°C (90°F). The month sees significant rainfall, totaling 326 mm (12.8 in) over 25 days, accompanied by high humidity levels of 82%. In contrast, October experiences slightly cooler temperatures, with a minimum of 23°C (73°F), while maintaining the same average and maximum temperatures as September. Precipitation decreases to 254 mm (10.0 in) over just 17 days, and humidity drops to 78%. For more detailed information, visit Chattogram weather in October.
In September, the weather is hot and humid, with average temperatures ranging from a minimum of 26°C (79°F) to a maximum of 32°C (90°F). During this month, the region experiences significant rainfall, totaling 326 mm (12.8 in) over 25 days, resulting in a high humidity level of 82%.
In contrast, November offers a more comfortable climate, with temperatures dropping slightly to an average of 25°C (78°F), peaking at 30°C (87°F) and a minimum of 20°C (67°F). The precipitation decreases dramatically to just 42 mm (1.6 in) over only 4 days, accompanied by lower humidity at 68%. For further details on the weather conditions, you can refer to Chattogram weather in November.
In September, the weather is characterized by higher temperatures, with a minimum of 26°C (79°F) and an average of 28°C (83°F), while the maximum can reach up to 32°C (90°F). This month also sees significant rainfall, accumulating 326 mm (12.8 in) over 25 days, leading to a high humidity level of 82%. In contrast, December experiences much cooler temperatures, with a minimum of 16°C (61°F) and an average of 22°C (71°F), peaking at 28°C (83°F). Rainfall is minimal in December, totaling only 24 mm (0.9 in) over just 2 days, contributing to a lower humidity level of 64%. For more details about December weather in Chattogram, visit Chattogram weather in December.
As September arrives in Chattogram, the weather takes on a distinct character, marked by high humidity and a significant increase in rainfall compared to the preceding months. With frequent rain over approximately 25 days, the lush landscape comes alive, offering a refreshing contrast to the typically drier summer months. Despite the warm temperatures, which hover around an average of 28°C (83°F), the combination of heat and humidity can create a muggy atmosphere. Those looking to understand the climatic nuances will find that September sets the stage for the upcoming monsoon season, making it unique in comparison to the drier, hotter summer periods. For more detailed insights, explore Chattogram Climate.