Pudukkottai, Thanjavur, Ariyalur, Perambalur, and Tiruchirappalli districts of Tamil Nadu should brace for heavy rain and possible thunderstorms on Sunday, the India Meteorological Department (IMD) said.

Heavy to very heavy rain at isolated places is also likely over Nilgiris, Coimbatore, Tiruppur, Karur, Dindigul, Madurai, Sivaganga, Ramanathapuram, Salem, Namakkal, Kallakurichi, Cuddalore, Mayiladuthurai, Karaikal, Tiruvarur, Nagapattinam, Villuppuram, and Puducherry districts, it added.

Dharmapuri, Virudhunagar, Tiruvannamalai, Chengalpattu, Kancheepuram, Tiruvallur, Chennai, Theni, and Kanyakumari districts, meanwhile, are likely to get heavy rain at isolated places.

According to sub-division-wise warnings released by the IMD's Chennai Regional Meteorological Centre on Sunday, extremely heavy rain, thunderstorms, lightning, and squalls should be expected today (Red Alert). On Monday, October 26, very heavy rain, thunderstorms, and lightning should be expected (Orange Alert). On Tuesday, October 27, a Yellow Alert is in place, but there are no warnings afterwards.

Given below is the weekly rain forecast and warnings for Tamil Nadu:

HEAVY RAINFALL WARNING

Day 1 (25.10.2026)

Red alert: Heavy to very heavy rain at isolated places, with extremely heavy rain at one or two places, is likely to occur over Pudukkottai, Thanjavur, Ariyalur, Perambalur and Tiruchirappalli districts.

Orange alert: Heavy to very heavy rain is likely to occur at isolated places over Nilgiris, Coimbatore, Tiruppur, Karur, Dindigul, Madurai, Sivaganga, Ramanathapuram, Salem, Namakkal, Kallakurichi, Cuddalore, Mayiladuthurai, Karaikal, Tiruvarur, Nagapattinam, Villupuram and Puducherry districts.

Yellow alert: Heavy rain is likely to occur at isolated places over Erode, Krishnagiri, Dharmapuri, Virudhunagar, Tiruvannamalai, Chengalpattu, Kancheepuram, Tiruvallur, Chennai, Theni and Kanyakumari districts.

Day 2 (26.10.2026)

Orange alert: Heavy to very heavy rain is likely to occur at isolated places over Pudukkottai, Sivaganga and Ramanathapuram districts.

Yellow alert: Heavy rain is likely to occur at isolated places over Kanyakumari, Tirunelveli, Thoothukudi, Tenkasi, Virudhunagar, Madurai, Theni, Dindigul, Karur, Tiruchirappalli, Thanjavur, Tiruvarur and Nagapattinam districts.

Day 3 (27.10.2026)

Heavy rain is likely to occur at isolated places over Ramanathapuram district.

THUNDERSTORM WARNING

Day 1 (25.10.2026) to Day 3 (27.10.2026): Thunderstorms and lightning, accompanied by gusty winds reaching 40–50 kmph, are likely to occur at one or two places over Tamil Nadu, Puducherry and the Karaikal area.

RAINFALL FORECAST & WARNINGS

Day 1 (25.10.2026)

• Heavy to very heavy rain at isolated places, with extremely heavy rain at one or two places with thunderstorms and lightning with gusty wind speed reaching 40–50 kmph at one or two places, is likely to occur over Pudukkottai, Thanjavur, Ariyalur, Perambalur and Tiruchirappalli districts.

• Heavy to very heavy rain at isolated places with thunderstorm and lightning with gusty wind speed reaching 40–50 kmph at one or two places is likely to occur over Nilgiris, Coimbatore, Tiruppur, Karur, Dindigul, Madurai, Sivaganga, Ramanathapuram, Salem, Namakkal, Kallakurichi, Cuddalore, Mayiladuthurai, Karaikal, Tiruvarur, Nagapattinam, Villupuram and Puducherry districts.

• Heavy rain at isolated places with thunderstorm and lightning with gusty wind speed reaching 40–50 kmph at one or two places is likely to occur over Erode, Krishnagiri, Dharmapuri, Virudhunagar, Tiruvannamalai, Chengalpattu, Kancheepuram, Tiruvallur, Chennai, Theni and Kanyakumari districts.

• Moderate rain at most places with thunderstorm and lightning with gusty wind speed reaching 40–50 kmph at one or two places is likely to occur over Tenkasi, Thoothukudi, Tiruppatur, Vellore, Ranipet and Tirunelveli districts.

Day 2 (26.10.2026)

• Heavy to very heavy rain at isolated places with thunderstorm and lightning with gusty wind speed reaching 40–50 kmph at one or two places is likely to occur over Pudukkottai, Sivaganga and Ramanathapuram districts.

• Heavy rain at isolated places with thunderstorm and lightning with gusty wind speed reaching 40–50 kmph at one or two places is likely to occur over Kanyakumari, Tirunelveli, Thoothukudi, Tenkasi, Virudhunagar, Madurai, Theni, Dindigul, Karur, Tiruchirappalli, Thanjavur, Tiruvarur and Nagapattinam districts.

• Moderate rain at many places with thunderstorm and lightning with gusty wind speed reaching 40–50 kmph at one or two places is likely to occur over rest Tamil Nadu, Puducherry and Karaikal area.

READ THE WEATHER REPORT IN FULL HERE

Day 3 (27.10.2026)

• Heavy rain at isolated places with thunderstorm and lightning with gusty wind speed reaching 40–50 kmph at one or two places is likely to occur over Ramanathapuram district.

• Moderate rain at a few places with thunderstorm and lightning with gusty wind speed reaching 40–50 kmph at one or two places is likely to occur over South Tamil Nadu and Western Ghat districts.

• Light rain at a few places with thunderstorm and lightning at one or two places is likely to occur over rest Tamil Nadu, Puducherry and Karaikal area.

Day 4 (28.10.2026)

• Light to moderate rain is likely to occur at isolated places over South Tamil Nadu and Western Ghat districts.

• Light rain is likely to occur at isolated places over rest Tamil Nadu, Puducherry and Karaikal area.