Heavy Rain Expected in Tamil Nadu Today! Weather Update - September 19, 2025
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Today's Key Weather Information (September 19, 2025):
Today's weather update brings several new and important details. The key points we need to pay attention to are:
• The atmospheric upper air cyclonic circulation that was previously over Marathwada (interior Maharashtra) has now completely dissipated.
• An atmospheric upper air cyclonic circulation is present from Telangana to Rayalaseema.
Movement of Atmospheric Systems:
Several atmospheric upper air cyclonic circulations have shifted through Tamil Nadu towards Andhra Pradesh, along the East-West Shear Zone. Meanwhile, the atmospheric upper air cyclonic circulation located over Myanmar is expected to move inland over the next couple of days, entering the northwest Bay of Bengal. It is anticipated to strengthen into a well-marked Low Pressure Area and then into a Depression, moving slowly. During this period, the East-West Shear Zone will return to central Indian regions, transforming into a trough, and bringing the Low Pressure Area and the Southwest Monsoon to the western coastal areas. This pattern is typical for a break period in the monsoon.
Recent Rainfall Activity:
Due to these systems, widespread heavy rainfall has been recorded in Tamil Nadu over the past three days. Notably, yesterday, heavy to very heavy rain was reported in northern interior Tamil Nadu, specifically in Krishnagiri, Tirupattur, and Vellore districts. Tirupattur alone recorded up to 20 cm of rainfall. We continue to post rainfall updates and details on our Facebook page.
Rainfall Outlook for the Next 24 Hours (September 19, 2025):
Kerala:
• Moderate to heavy rain is expected in Kasaragod, Kannur, western parts of Malappuram, Palakkad, Idukki, and Pathanamthitta districts.
• Other districts including Thiruvananthapuram, Kollam, Kottayam, Alappuzha, Ernakulam, Thrissur, Malappuram, Kozhikode, and Wayanad may experience light to moderate rain.
Karnataka:
• Due to the influence of the atmospheric upper air cyclonic circulation and the system over interior Maharashtra, widespread moderate to heavy rain is likely in Kalyana Karnataka, Bidar, Gulbarga, Yadgir, Raichur, Bellary, Bijapur, Bagalkot, Koppal, Vijayapura, Vijayanagara, Gadag, Dharwad, Belgaum, Goa, Uttara Kannada, Shivamogga, Udupi, Dakshina Kannada, and Kodagu.
• Bengaluru, Chikkaballapur, and Kolar districts are also expected to receive moderate to heavy rain
.
• Other districts may see light rain.
Andhra Pradesh:
• Guntur, Bapatla, Prakasam, Kavali, Nellore, Kadapa, Nandyal, Kurnool, Anantapur, Annamayya, and Chittoor districts may also experience moderate to heavy rain in some areas.
Telangana:
• Moderate to heavy rain is likely in the entirely western parts, including Hyderabad, Ranga Reddy, Mahbubnagar, Warangal, Jagtial, Vikarabad, Narayanpet, Sangareddy, Medak, Kamareddy, Nizamabad, Adilabad, Kothagudem, Karimnagar, and Siddipet.
• Southern parts may experience light to moderate rain.
Tamil Nadu:
• South Tamil Nadu: Nagercoil, Kanyakumari, Tirunelveli, Thoothukudi, Virudhunagar, Tenkasi, and Ramanathapuram districts will see light to moderate rain in a few areas.
• Theni, Dindigul, Madurai, and Sivaganga districts are likely to have widespread light rain, with moderate to heavy rain in some parts.
• Western Tamil Nadu (Coimbatore, Tiruppur) and Central Tamil Nadu (Karur), along with the Delta districts (Pudukkottai, Thanjavur, Tiruvarur, Nagapattinam, Karaikal), may experience light to moderate rain in a few areas.
• Nilgiris, Erode, Krishnagiri, Dharmapuri, Salem, Namakkal, Trichy, Perambalur, Ariyalur, Cuddalore, Mayiladuthurai, Kallakurichi, Vellore, Tirupattur, Tiruvannamalai, Ranipet, Kancheepuram, and Chennai are expected to see widespread moderate rain, with heavy rain possible in some areas.
• Heavy rain, with very heavy rain in some parts, is anticipated in Tiruvallur, Chengalpattu, Villupuram, Puducherry, and the eastern parts of Kallakurichi.
Rainfall in the Coming Days:
The rainfall activity in Tamil Nadu is expected to continue for the next two days. After that, we can anticipate a decrease in rainfall, with the intensity likely to reduce from September 21st. However, there is a possibility that the rain might intensify again after a few days. We will provide further details on this in our next update.
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