Tamil Nadu, Puducherry & Karaikal Weather Forecast Northeast Monsoon 2025

Overview

The Northeast Monsoon has officially commenced on October 16, 2025, bringing enhanced rainfall activity across Tamil Nadu, Puducherry, and Karaikal. The region is expected to experience varied weather conditions over the next week, with significant impacts on daily life, agriculture, and fisheries. Below is a detailed forecast and actionable advice for residents and stakeholders.

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Weather Forecast (October 16–22, 2025)

  • Light to Moderate Rainfall: Expect light to moderate rain and thunderstorms at some or isolated places from October 16 to 22.
  • Heavy Rainfall: Isolated heavy rainfall is likely during the same period, with very heavy rainfall expected on October 16 and 17.
  • Thunderstorms and Lightning: Thunderstorms accompanied by lightning are forecast for the next five days.
  • Past 24 Hours (as of October 16): Heavy to very heavy rainfall (7–20 cm) was recorded at isolated places, including:
    • Tiruchendur: 15 cm
    • Kayalpattinam: 15 cm
    • Thiruchendur AWS: 13 cm
    • Tuticorin: 9 cm
    • Arcot: 9 cm
    • Satankulam: 8 cm
    • Nanguneri: 7 cm
    • Nambiyar Dam: 7 cm

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Impacts and General Suggestions

The ongoing monsoon activity may lead to several challenges across the region. Residents are advised to prepare for the following impacts and take necessary precautions:

  • Localized Flooding: Roads and low-lying areas may experience water logging, with potential closure of underpasses, particularly in urban areas.
  • Traffic Disruptions: Reduced visibility and waterlogged roads may cause traffic congestion. Check traffic updates before traveling.
  • Structural Damage: Minor damage to kutcha roads and vulnerable structures is possible, along with localized landslides or mudslides.
  • Agricultural Impact: Horticulture and standing crops may face damage due to inundation or riverine flooding.

General Precautions:

  • Follow local weather and traffic advisories.
  • Avoid waterlogged areas and vulnerable structures.
  • Stay updated on potential riverine flooding risks.

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Agromet Advisories

Farmers are advised to take the following measures to protect crops and ensure agricultural productivity:

  • Storage: Store harvested rice and groundnut in safe, dry locations to prevent damage from rain.
  • Drainage: Ensure proper drainage in fields of rice, cotton, turmeric, garlic, ginger, vegetables, and plantations such as coconut, banana, and black pepper to avoid water stagnation.
  • Support for Crops: Provide mechanical support to horticultural crops and stake vegetables and young fruit plants to prevent lodging during gusty winds.
  • Protection of Harvested Crops: Tie and cover harvested crops to prevent displacement due to strong winds or heavy rain.

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Livestock and Fishery Advisories

To safeguard livestock and fishery resources, consider the following:

  • Livestock: Keep animals in sheds during heavy rainfall and provide balanced feed. Store feed and fodder in safe, dry places.
  • Fishery: Construct outlets with netting around ponds to prevent fish from escaping during heavy rain.

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Fisherman Warning

Fishermen are strongly advised to avoid venturing into the following areas due to rough sea conditions:

  • Gulf of Mannar: October 16–21, 2025
  • Tamil Nadu Coast and Adjoining South Andhra Pradesh Coasts: October 16–17, 2025
  • Southern Parts of South Bay of Bengal: October 20, 2025

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Conclusion

The onset of the Northeast Monsoon brings significant weather changes to Tamil Nadu, Puducherry, and Karaikal. By staying informed and following the recommended precautions, residents, farmers, and fishermen can mitigate risks and ensure safety. Stay tuned to local weather updates and advisories for real-time information.