Nilgiris alert upgraded: isolated heavy to very heavy rain likely October 23–26

Update — October 23, 2026, 10.58 a.m. IST: RMC Chennai’s district rainfall forecast issued at 3 p.m. on October 22 places the Nilgiris under an isolated heavy-to-very-heavy-rain outlook on October 23, 24, 25 and 26. Compared with the forecast issued on October 21, the heavy-to-very-heavy-rain outlook now extends through October 26.

RMC also forecasts thunderstorms, lightning and gusty winds of 40–50 km/h at one or two places across the Tamil Nadu–Puducherry–Karaikal subdivision on October 23. “Isolated” means one or two places and does not imply uniform rainfall across the district. Use extra caution on hill roads, landslide-prone slopes, low-lying areas and near fast-flowing water. The bulletin does not itself announce a school holiday or blanket road closure.

Update — October 22, 2026, 5.01 a.m. IST: RMC Chennai’s latest district forecast, issued on October 21, places the Nilgiris under an isolated heavy-to-very-heavy-rain outlook for October 22, 23 and 24. This is an upgrade from the earlier heavy-rain outlook.

“Isolated” means one or two places and does not imply uniform rainfall across the district. Use extra caution on hill roads, landslide-prone slopes, low-lying areas and near fast-flowing water. The weather bulletin does not itself announce a school holiday or blanket road closure; check official Nilgiris district notices for any such decisions.

Update — October 20, 2026, 5.05 a.m. IST: Tamil Nadu Revenue and Disaster Management Minister K. A. Sengottaiyan said orange alerts had been issued for the Nilgiris, Coimbatore, Tiruvarur, Mayiladuthurai, Thanjavur and Pudukkottai, and that district administrations were prepared, according to a report published late on October 19.

RMC Chennai’s warning issued on October 20 places the Tamil Nadu–Puducherry–Karaikal subdivision under an isolated very-heavy-rain warning today and on October 21, together with thunderstorm, lightning and strong-wind hazards. Isolated heavy-rain warnings continue from October 22 to 26. This is a subdivision-wide forecast and does not mean uniform rainfall across the Nilgiris.

Use extra caution on hill roads, landslide-prone slopes, low-lying areas and near fast-flowing water. Check the latest district-administration, police and IMD notices before travelling.

Update — October 19, 2026, 5.00 a.m. IST: The Nilgiris has an outlook for heavy rain at isolated places today. The district-level warning continues with isolated heavy to very heavy rain on October 20 and isolated heavy rain from October 21 to 23.

IMD’s bulletin issued at 1.30 p.m. on October 18 says the Tamil Nadu–Puducherry–Karaikal subdivision may receive isolated very heavy rain from October 19 to 21 and isolated heavy rain from October 22 to 24, with fairly widespread to widespread rain. Thunderstorms, lightning and winds of 40–50 km/h, gusting to 60 km/h, are also possible. This is a subdivision-wide outlook; it is not a Nilgiris-specific warning for October 24.

IMD said a low-pressure area formed over the southwest Arabian Sea on October 18 and was likely to become more marked during the following 24 hours. Localised landslides, road disruption and waterlogging are possible in vulnerable areas, so travellers should check the latest district-level warning before setting out.

Update — morning of October 18, 2026: Chennai and several parts of North Chennai received an intense spell of rain from the night of October 17 into early October 18. Ennore Port recorded 222.5 mm in the 24 hours ending at 5.30 a.m., according to the Times of India.

Waterlogging was reported in areas including Tiruvottiyur, Manali, Parry’s Corner and Mannadi. Greater Chennai Corporation Commissioner G.S. Sameeran was quoted as saying that more than 15,000 sanitation and other civic workers were deployed through the night. The State Disaster Response Force positioned 100 personnel as a precaution.

RMC Chennai’s October 18 warning places the Tamil Nadu–Puducherry subdivision under a very-heavy-rain warning at isolated places, together with thunderstorm, lightning and squally-weather hazards. The Nilgiris is among the districts listed for isolated heavy rain today.

• Nilgiris — October 18: Heavy rain at isolated places.
• October 19: Heavy rain at isolated places.
• October 20: Heavy to very heavy rain at isolated places.
• October 21–23: Heavy rain at isolated places.

“Isolated places” does not mean uniform rainfall across the district. Weather warnings can change as conditions develop.