§  Real winter arrives after Dec 4

§  Kolkata 23-24°C. Full forecast now.!

§  West Bengal monsoon withdrew Oct 13, 2025

§  IMD forecasts cyclones & low-pressure until Nov

West Bengal Weather Update: Kolkata residents and West Bengal weather watchers have been asking the same question—when will the real winter arrive.? While the southwest monsoon officially withdrew from the state on October 13, 2025 bringing dry and pleasant weather, the India Meteorological Department (IMD) has forecasted that multiple low-pressure systems, potential cyclones and western disturbances will delay the onset of intense winter cold until at least December 4-5, 2025.

Monsoon Bids Farewell – Dry Days Ahead for Bengal

The southwest monsoon completely withdrew from West Bengal on October 13, 2025 marking the end of the rainy season. According to the Alipore Weather Department, the line of monsoon withdrawal now passes through Karwar, Kalburgi, Nizamabad, Kanker, Keonjhargarh, Sagar Island and Guwahati. This is the third consecutive year that the monsoon has withdrawn from South Bengal and Kolkata on precisely the same dates—October 12-13.

Following the monsoon’s exit, the next five days will witness completely dry weather across West Bengal. No rainfall has been recorded in any district of North Bengal or South Bengal in the past 24 hours. The IMD has confirmed that there is zero possibility of rain across the state for the next five days with clear skies expected throughout.

Current Temperature Conditions: Pleasant Mornings, Warm Afternoons

Kolkata and its surrounding districts are currently experiencing ideal autumn weather. Day and night temperatures are hovering below normal seasonal averages, creating comfortable conditions, especially during early morning hours.

·       Current Temperature Breakdown

o   Kolkata Minimum Temperature: 23-24°C (below normal)

o   Kolkata Maximum Temperature: 32-33°C (near normal)

o   Relative Humidity: Dropped to 50% during mornings

o   Weather Pattern: Pleasant autumn mornings, rising temperatures from 10 AM, humidity climbing back to 90% by afternoon, returning to dry and comfortable conditions by evening

The western districts of Bengal are experiencing even cooler temperatures. Areas like Bankura, Purulia, Birbhum and parts of West Bardhaman are recording temperatures 2-3 degrees Celsius lower than Kolkata. Shriniketan has already recorded nighttime temperatures dropping to 20°C. Within the next 72 hours, similar cooling is expected in Bankura, Purulia, Panagarh (West Bardhaman) and Jhargram districts.

Why Winter is Delayed – Multiple Weather Systems on the Horizon

Despite the pleasant post-monsoon weather, true winter chill will be delayed due to a series of atmospheric disturbances. The IMD’s long-term weather outlook indicates that late October and almost the entire month of November will witness multiple low-pressure systems, potential cyclones and western disturbances that will prevent the establishment of sustained cold weather patterns.

·       Weather Systems Expected

o   Late October (October 20-28): Formation of low-pressure areas over Bay of Bengal

o   November: 3-4 depression or low-pressure systems possible with 1-2 potentially intensifying into cyclones

o   Western Disturbances: Intermittent systems affecting North India will prevent cold northerly winds from reaching Bengal

According to meteorological forecasts, the real onset of winter in Kolkata and surrounding areas is not expected before December 4-5, 2025. Before December, nighttime temperatures in Kolkata are unlikely to drop below 15°C.

Cyclone Alert: Potential Storm Formation on October 25, 2025

Adding to the weather complexity, the European Union-recognized Weather Forecasting System (WFS) has predicted the formation of a powerful cyclonic system in the Bay of Bengal. While the IMD has not yet issued any official warning or forecast regarding this system, WFS has provided specific details

·       Cyclone Formation Timeline

o   October 25, 2025 (3 AM IST): A very strong low-pressure area will form near Indira Point in the South Andaman Sea

o   October 27-28, 2025: The system is expected to intensify into a cyclonic storm

o   Movement Path: The system will gather moisture and energy while staying over water on October 25-26, keeping the Andaman & Nicobar Islands to its left, moving toward the Indian mainland

o   October 27: The system will approach very close to the Tamil Nadu coast

·       Two Possible Paths Predicted

o   Path 1: Moving through Puducherry coast toward the Arabian Sea

o   Path 2: Continuing along the Bay of Bengal coastline toward Gopalpur on the Odisha-Andhra border

The IMD has confirmed enhanced rainfall activity over Kerala and Tamil Nadu for the next seven days but has not yet issued specific cyclone warnings. Continuous monitoring is underway.

Winter 2025-2026: La Niña to Bring Colder Temperatures

When winter finally arrives in December, it could be more intense than recent years due to the development of La Niña conditions in the Pacific Ocean. The India Meteorological Department has forecasted that La Niña—the cooling phase of the El Niño Southern Oscillation (ENSO)—is expected to persist from October 2025 through February 2026.

·       La Niña Impact on India

o   Colder-than-normal winter across most parts of India, especially northern regions

o   Increased snowfall in Himalayan areas and more frequent cold waves

o   Extended winter season with temperatures potentially 1.6-3.0°C below normal in some regions

o   North India most affected: Delhi-NCR, Punjab, Haryana, Uttar Pradesh and Bihar expected to experience severe cold

For West Bengal, the winter season of 2025-2026 is expected to run from December 2025 to mid-February 2026. While Kolkata may not experience extreme cold like North India, the La Niña effect could bring more pronounced temperature drops, especially during night hours.

·       District-Wise Temperature Forecast

o   Kolkata & Adjacent Districts

-        Minimum: 23-24°C (current), dropping to 15-18°C by December

-        Maximum: 32-33°C (current), dropping to 24-28°C by December

-        Clear skies for next 5 days, with occasional partial cloud cover in some areas

o   Western Districts (Bankura, Purulia, Birbhum, West Bardhaman)

-        Current minimum temperatures already near 20°C

-        Expected to drop to 12-15°C by December

-        Cooler than Kolkata by 2-3°C throughout the season

o   North Bengal (Darjeeling, Jalpaiguri, Alipurduar, Cooch Behar)

-        Currently experiencing cooler temperatures due to proximity to hills

-        Winter will set in earlier than South Bengal

-        Sub-Himalayan areas may experience fog and occasional cold waves

What November Will Bring: Active Weather Period

November 2025 is shaping up to be an active post-monsoon month with multiple weather systems. According to long-range forecasts, 3-4 low-pressure areas or depressions are likely to form over the Bay of Bengal between October 18 and November 25 with 1-2 potentially intensifying into cyclones.

·       November Weather Outlook

o   Temperature: Average 22-31°C across West Bengal​

o   Rainfall: Minimal, with 1-2 rainy days possible due to weather systems​

o   Dry Days: Approximately 29 days​

o   Cyclone Risk: Moderate to high for coastal areas, especially South Andhra Pradesh, Tamil Nadu, and Eastern Sri Lankayoutube​

These weather disturbances will prevent the establishment of persistent cold northerly winds which are essential for winter temperatures to drop significantly in Bengal.

·       December 2025: The Real Winter Begins

o   December marks the official start of winter in West Bengal. By early December, particularly after December 4-5, sustained cold weather patterns are expected to establish across the state.

·       December Weather Characteristics

o   Temperature Range: 19-28°C across West Bengal

o   Rainy Days: Zero (completely dry month expected)

o   Sunshine Hours: 11.6 hours per day

o   Weather: Pleasant days, cool nights, ideal for outdoor activities

With La Niña conditions persisting, December 2025 could be colder than average with nighttime temperatures in Kolkata potentially dropping to 15°C or below by mid-December.

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Expert Weather Analysis: Why the Delay.?

Meteorologists explain that the transition from monsoon to winter in eastern India typically involves a complex interplay of multiple atmospheric systems. The post-monsoon season (October-November) is characterized by the formation of cyclonic systems in the Bay of Bengal which bring moisture and warmer air masses that prevent cold continental air from establishing dominance.

“The southwest monsoon withdrawal is just the first step. For winter to truly set in, we need the cessation of all tropical weather systems and the establishment of cold northerly winds from the Himalayas. This year, with multiple low-pressure systems predicted through November, winter will be delayed,” explained weather experts.

The La Niña phenomenon adds another dimension to this year’s winter forecast. By strengthening the polar jet stream and increasing western disturbances, La Niña can bring colder air masses to India, resulting in a more intense winter once it finally arrives.

Travel and Agriculture Impact

·       For Travelers

o   October-November is ideal for visiting West Bengal with pleasant weather

o   December onwards, carry warm clothing, especially for western and northern districts

o   Fog may affect travel in December-January, particularly in sub-Himalayan regions

·       For Farmers

o   Post-monsoon dry spell favorable for harvesting Kharif crops

o   Prepare for potential Rabi season delays if November weather systems bring unexpected rain

o   Cold waves in December-January may affect crops like mustard and wheat in western districts

Conclusion: Patience Required for Winter Lovers

While the monsoon has officially withdrawn from West Bengal on October 13, 2025 bringing much-needed dry and pleasant weather, winter enthusiasts will need to wait until at least early December before experiencing genuine cold temperatures. The intervening period will see multiple low-pressure systems and potential cyclones that will keep temperatures moderate.

However, when winter does arrive, it could be more pronounced than recent years due to La Niña conditions. The 2025-2026 winter season, extending from December through mid-February, promises colder-than-normal temperatures, especially in northern and western districts of Bengal.

The IMD continues to monitor atmospheric conditions closely and updated forecasts will be issued as weather systems develop. Residents should stay informed about potential cyclone warnings, particularly for coastal areas in late October.

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