Last updated: August 21, 2025
September in Kolkata is characterized by warm temperatures and high humidity, making it a month of transition as the city moves towards the festive season. With maximum temperatures reaching 35°C (96°F) and an average of 29°C (85°F), residents experience a notable warmth, while minimums hover around 25°C (77°F). The month is also marked by significant rainfall, totaling 278 mm (10.9 in) over 27 days, leading to lush greenery and vibrant surroundings. Humidity levels soar to 86%, creating a tropical atmosphere that defines Kolkata’s September landscape.
In September, Kolkata experiences a welcome transition as the monsoon season begins to recede. With temperatures ranging from a minimum of 25°C (77°F) to a comfortable average of 29°C (85°F), the city's warmth starts to feel less oppressive. The maximum temperature gently cools to around 35°C (96°F), marking a notable shift from the sweltering highs of the preceding summer months. This slight dip in temperature, paired with the lingering humidity, creates a vibrant atmosphere ideal for exploring the city's rich culture and heritage. As the city begins to shed the monsoon's heavy cloak, September sets the stage for a delightful fall, inviting both locals and visitors to bask in its charms.
In September, Kolkata experiences a significant shift in rainfall, with 278 mm (10.9 in) marking a noteworthy decrease from the deluge of the preceding months. This month typically sees 27 days of precipitation, maintaining the city's reputation for frequent rain during the monsoon season, yet it offers a respite compared to the intensity of July and August. The gradual decline in rainfall from the peak summer months indicates the transition towards the end of the monsoon, as October looms with its milder 178 mm (7.0 in) forecast. The month maintains a lush landscape, laying a foundation for the festive season while also hinting at the gradual tapering of the monsoon's influence.
September in Kolkata sees a continuation of the high humidity trend that begins in the monsoon months. With humidity levels peaking at 86%, the air becomes thick and heavy, reminiscent of the preceding August. This month maintains the same oppressive moisture, contributing to a sultry atmosphere that can feel stifling, especially after the summer’s drier spells. The shift from the harsh summer months of March and April, with their significantly lower humidity levels of 32% and 30%, highlights the drastic change as the region transitions into the wet season. As autumn approaches, while humidity begins to taper slightly in October to 83%, September remains firmly entrenched in the heart of Kolkata's muggy climate, preparing residents for the upcoming changes in weather.
In September, Kolkata experiences a high UV Index of 13, placing it in the extreme exposure category. This marks a continuation of the intense UV conditions that began in the preceding months of July and August, where the UV Index also reached 13. As the sun's rays remain potent, the recommended burn time is just 10 minutes, underscoring the urgent need for protective measures. This trend of extreme UV levels continues into October, highlighting the importance of staying informed about sun exposure to safeguard skin health throughout this period. For more detailed insights, visit Kolkata UV Index.
UV Risk Categories
As September unfolds in Kolkata, a blend of sunshine and respite marks the end of the monsoon season. With 272 hours of sunlight, September offers a gentle transition from the sweltering summer to the more temperate months ahead. While this month sees a slight dip in hours compared to the vibrant days of May, which boasts 345 hours, it still reflects the lingering warmth of summer. The gradual decline in sunlight hours from the peak in April and May signals the approach of autumn, yet it remains brighter than the dampness of June and July, showcasing the city's enduring charm. As October approaches, Kolkata's skies promise to bounce back with 289 hours, inviting the city to bask in the early warmth of fall.
As September rolls into Kolkata, the likelihood of sunny weather significantly diminishes, with only a 9% chance of sunshine. Following the intense heat of summer, the city's weather transitions into the monsoon season, where clouds dominate the sky. This sharp decline in sunny days sharply contrasts with the brighter months preceding it—January through April boast remarkably high chances of sun, peaking at 87% in January. As the rainy season takes hold in June and July, the subsequent months of August and September are shrouded in gloom, leaving the residents and visitors yearning for the return of clearer skies. With October seeing a gradual improvement to a 50% chance, the post-monsoon period offers a glimmer of hope for sunshine enthusiasts once again.
In Kolkata, India, September marks a transitional phase as the city enjoys about 12 hours of daylight, mirroring the lengths observed in both March and April. Following the peak of summer in May and June, where daylight stretches to 13 hours, September signals a gentle shift towards shorter days, akin to the gradual decline seen in October and November. The consistent daylight duration throughout the months showcases Kolkata's tropical climate, where daylight remains relatively stable, creating an inviting ambiance as the monsoon recedes and the city prepares for the festive season ahead. As daylight dips slightly, the city's vibrant life continues to buzz, embracing the balance between light and shadow that autumn brings.
As September arrives in Kolkata, a gentle shift in the air can be felt, with the average wind speed settling at 2.6 m/s (6 mph). This marks a slight decrease from the peak winds of the summer months, which saw speeds reaching up to 3.3 m/s (7 mph) in May. The winds start to mellow, transitioning from the more active summer gusts to the quieter whispers of autumn. Interestingly, the trend shows that while earlier months like April and May experience a surge in wind activity, September evokes a more serene ambiance, hinting at the cooler, calmer days ahead as the city prepares to embrace the full charm of the fall season. The overall consistency in wind speed, despite minor fluctuations, creates a soothing backdrop for the vibrant life of Kolkata as it transitions into autumn.
Weather in Kolkata varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Kolkata, focusing on differences in temperature, rainfall, humidity, and UV levels.
September and January present striking contrasts in weather conditions. In September, temperatures soar with a minimum of 25°C (77°F) and an average of 29°C (85°F), peaking at a maximum of 35°C (96°F). This month also sees significant precipitation, with 278 mm (10.9 in) of rainfall spread over 27 days, contributing to high humidity levels of 86%. In stark contrast, January brings cooler temperatures, ranging from a minimum of 10°C (50°F) to a maximum of 31°C (89°F), with a much more comfortable average of 19°C (66°F). Additionally, January experiences minimal rainfall of just 6 mm (0.2 in) over only 1 day, along with a lower humidity level of 55%. For a more detailed look at January’s weather, visit Kolkata weather in January.
September and February present distinctly different weather experiences. In September, temperatures range from a minimum of 25°C (77°F) to a maximum of 35°C (96°F), with an average of 29°C (85°F). This month is characterized by high humidity at 86% and significant rainfall, averaging 278 mm (10.9 in) over 27 days. In contrast, February is much cooler, with temperatures varying between a minimum of 10°C (51°F) and a maximum of 35°C (96°F), yielding an average of 22°C (72°F). The month sees minimal precipitation, with only 20 mm (0.8 in) of rain over just 1 day and much lower humidity at 45%. For more details on February weather, check out Kolkata weather in February.
When comparing the weather in September and March, notable differences emerge. September experiences a warmer climate, with minimum temperatures around 25°C (77°F) and an average of 29°C (85°F), while March starts cooler with temperatures dropping to a minimum of 16°C (61°F) and an average of 27°C (81°F). Additionally, September is characterized by high humidity at 86% and substantial rainfall totaling 278 mm (10.9 in) over 27 days, making it quite rainy. In contrast, March offers a drier experience with only 43 mm (1.7 in) of rainfall spread over just 5 days, and significantly lower humidity at 32%. For more details on March’s weather patterns, you can visit Kolkata weather in March.
In September, temperatures range from a minimum of 25°C (77°F) to a maximum of 35°C (96°F), with an average temperature of 29°C (85°F). The month is characterized by high humidity at 86% and substantial rainfall, accumulating 278 mm (10.9 in) over an average of 27 rainy days. In contrast, April boasts slightly lower minimum temperatures at 20°C (68°F) and can reach highs of up to 39°C (103°F), while maintaining an average temperature of 30°C (86°F). With only 89 mm (3.5 in) of precipitation over just 11 days and a much lower humidity of 30%, April presents a drier and hotter climate. For more detailed information on Kolkata's weather during April, visit Kolkata weather in April.
When comparing the weather in September and May, we see distinct differences in temperature and humidity. September boasts a warm average temperature of 29°C (85°F), with highs reaching up to 35°C (96°F) and a high level of humidity at 86%. However, it also experiences significant rainfall, with 278 mm (10.9 in) of precipitation over 27 days. In contrast, May presents slightly higher average temperatures, peaking at 40°C (103°F), but maintains lower humidity levels at 56% and significantly less rainfall at 132 mm (5.2 in) over just 14 days. For more details on May weather, you can check Kolkata weather in May.
September and June both present warm temperatures, but June typically feels hotter with an average of 30°C (87°F) compared to September's 29°C (85°F). The maximum temperature in June can reach up to 39°C (102°F), significantly higher than September's peak of 35°C (96°F). While both months experience substantial rainfall, September sees a higher total of 278 mm (10.9 in) over 27 days compared to June's 265 mm (10.4 in) over 25 days. Additionally, September is characterized by higher humidity levels at 86%, making it feel more oppressive than June's 60%. For a more detailed look at June's weather, you can explore Kolkata weather in June.
When comparing the weather in September to July, we find that both months experience warm temperatures, but with some notable differences. In September, the minimum temperature averages around 25°C (77°F) and can reach a maximum of 35°C (96°F), while July sees slightly higher temperatures, with a minimum of 26°C (78°F) and a maximum of 36°C (97°F). Moreover, September has a notable average temperature of 29°C (85°F), which is just a degree lower than July's average of 30°C (86°F).
Rainfall is more pronounced in July, with a total precipitation of 353 mm (13.9 in) over 29 days, compared to September's 278 mm (10.9 in) spread across 27 days. The humidity is also higher in September at 86% compared to July's 84%. Overall, while both months are characterized by warm weather, July is wetter and slightly warmer than September. For more detailed insights, check out Kolkata weather in July.
In comparing the weather of September and August, both months exhibit similar minimum and average temperatures, with September maintaining a minimum of 25°C (77°F) and an average of 29°C (85°F), while August also has a minimum of 25°C (78°F) and the same average. However, August experiences a slightly higher maximum temperature of 36°C (97°F) compared to September’s 35°C (96°F). Precipitation levels are notably different, with September receiving 278 mm (10.9 in) over 27 days, while August sees a greater total of 353 mm (13.9 in) over 30 days, indicating more frequent rain during the latter month. Both months share a humidity level of 86%, creating a consistently muggy atmosphere. For more details, you can visit Kolkata weather in August.
In September, the weather in Kolkata is typically warm and humid, with minimum temperatures around 25°C (77°F) and an average temperature of 29°C (85°F). The month experiences significant rainfall, totaling 278 mm (10.9 in) over 27 days, contributing to a humidity level of 86%. Conversely, October offers a slightly cooler climate, with minimum temperatures dropping to 20°C (68°F) and an average temperature of 28°C (83°F). While October still sees warm weather, it has less precipitation—178 mm (7.0 in) over just 16 days—and lower humidity at 83%. For more detailed information, you can check Kolkata weather in October.
In September, the weather is characterized by high temperatures, with minimums around 25°C (77°F) and averages reaching 29°C (85°F), making it quite warm, especially compared to November. September also sees significantly more rainfall, averaging 278 mm (10.9 inches) over 27 days, coupled with high humidity levels at 86%, creating a muggy atmosphere. In contrast, November brings cooler temperatures, with minimums dropping to 14°C (57°F) and averages around 24°C (76°F). The month is much drier, with only 51 mm (2.0 inches) of precipitation over just 3 days, and humidity levels decline to 73%. For more detailed information, you can refer to the Kolkata weather in November.
The weather in September is characterized by high temperatures and significant humidity, with average highs reaching 29°C (85°F) and frequent rainfall, totaling 278 mm (10.9 in) over 27 days. In contrast, December brings a much cooler climate, with temperatures averaging between 10°C (51°F) and 30°C (86°F), and significantly less rainfall—only 51 mm (2.0 in) over just 2 days. Additionally, the humidity drops to 69%, making December feel more comfortable compared to the sweltering, humid days of September. For more detailed information, you can check Kolkata weather in December.
As September rolls in, Kolkata transitions from the sweltering heat of summer to a more humid atmosphere, characterized by increased rainfall and cooler temperatures. With significant precipitation spread across nearly the entire month, the city becomes a lush oasis, although the humidity can feel quite intense. Daytime temperatures remain warm but are tempered by the frequent showers, making this month distinct from the parched summer months. For a deeper insight into Kolkata's ever-changing climate patterns, explore Kolkata Climate.