Kolkata Weather September 2025 — Kolkata experienced moderate rainfall coupled with high humidity on September 26, 2025, bringing both relief and challenges to the city’s residents. The rainfall, following a series of monsoon showers in the past week, has influenced air quality, traffic conditions, and public activities across various neighborhoods.
According to the India Meteorological Department (IMD), the city recorded temperatures ranging between 25.7°C and 32.4°C, while relative humidity levels remained high at 81%, creating a humid and muggy atmosphere typical of late-monsoon Kolkata. Gentle winds of up to 20.9 km/h prevailed, and skies gradually cleared toward the evening, offering residents a temporary respite from the wet weather.
Kolkata Weather September 2025: Rainfall Patterns and Impact
The rainfall on September 26 was moderate in intensity, affecting both central and low-lying areas of the city. Certain zones, such as Tollygunge, Ballygunge, and Howrah, witnessed localized waterlogging due to poor drainage, affecting vehicular movement and pedestrian access.
- Traffic Disruptions: Key arterial roads, including Park Street and AJC Bose Road, experienced slow traffic. Public transport, particularly buses, faced delays as water accumulated in depressions and underpasses.
- Residential Areas: Low-lying neighborhoods experienced minor flooding, with residents advised to exercise caution while commuting.
- Pandal Precautions: With Durga Puja celebrations underway, several organizers reported wet conditions affecting temporary pandal flooring and electrical installations, prompting safety checks.
🔗 For guidance on urban flood management and drainage planning, see the Central Water Commission – Urban Flood Management Guidelines.
Air Quality Analysis
Despite the rainfall, Kolkata’s Air Quality Index (AQI) remained good, reflecting the cleansing effect of precipitation. As of September 25, the AQI stood at 47, indicating safe air quality levels for the general public.
- PM2.5 Levels: 22 µg/m³
- PM10 Levels: 47 µg/m³
- Carbon Monoxide (CO): 375 µg/m³
Experts note that monsoon rains help settle dust particles, reducing particulate matter and improving overall air quality. Residents with respiratory sensitivities, including asthma and allergies, are advised to continue standard precautions while benefiting from the cleaner air.
🔗 For detailed air quality data and updates, refer to the Central Pollution Control Board – Real-Time AQI Data.
Week-Long Weather Outlook
The IMD forecast indicates continued wet conditions for the coming week, reflecting late monsoon patterns in eastern India:
- September 27: Moderate rain expected with temperatures between 26°C and 30.9°C.
- September 28: Showers with highs reaching 31.7°C.
- September 29: Light scattered rainfall with partly cloudy skies.
- October 1-2: Patchy rain with temperatures ranging from 26°C to 32°C; stronger winds up to 31.7 km/h anticipated.
Residents are advised to carry umbrellas, use appropriate footwear, and plan travel cautiously. The cooler evening temperatures combined with gentle breezes are expected to offer comfortable conditions for outdoor activities.
🔗 For up-to-date weather alerts and warnings, refer to the India Meteorological Department – Kolkata Weather.
Implications for Public Health and Daily Life
The combination of high humidity and moderate rainfall has implications for public health, city infrastructure, and daily routines:
- Health Advisory: Prolonged exposure to high humidity can cause discomfort, particularly for elderly individuals and children. Proper hydration and lightweight clothing are recommended.
- Urban Mobility: Commuters should anticipate traffic congestion and minor flooding on underpasses and arterial roads.
- Public Events: With cultural festivals such as Durga Puja in full swing, organizers are advised to inspect electrical installations and flooring to prevent accidents.
🔗 For public health guidelines during monsoon seasons, see the Ministry of Health and Family Welfare – Monsoon Health Advisory.
Environmental and Ecological Considerations
Monsoon rains play a critical role in replenishing water bodies, recharging groundwater, and sustaining urban greenery. In Kolkata:
- Vegetation: Parks and gardens, including the Maidan and Botanical Gardens, have benefited from natural irrigation.
- Air Quality: The rainfall contributed to lower dust and particulate levels, improving overall environmental conditions.
- Urban Ecology: Continued monitoring is recommended to prevent stagnant water-related vector-borne diseases, such as dengue and malaria.
🔗 For information on vector control and urban ecology during monsoons, visit the National Vector Borne Disease Control Programme.
Conclusion
Kolkata’s weather on September 26, 2025, exemplifies the complex interplay of monsoon rainfall, humidity, and urban life. While moderate rain and high humidity present challenges in commuting, public events, and daily activities, they simultaneously improve air quality, sustain greenery, and replenish water resources.
As the city continues to navigate the late-monsoon period, residents are advised to remain prepared for intermittent rainfall, maintain awareness of public health guidelines, and exercise caution in flood-prone areas. With careful planning and attention to safety, the wet season can coexist harmoniously with Kolkata’s bustling cultural and civic life.
🔗 For real-time updates on weather, air quality, and city advisories, refer to:
- India Meteorological Department – Kolkata Forecast
- Central Pollution Control Board – Air Quality Data
- West Bengal Disaster Management & Civil Defence Department
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