# Weather patterns and rainfall in Tamil Nadu

> Developing situation record from CLSTR: https://clstr.news/situations/weather-patterns-and-rainfall-in-tamil-nadu
> Updated: 2026-11-07T05:27:02.000Z. Sources: 6. Developments: 2.

The Tamil Nadu region has experienced significant weather activity driven by the northeast monsoon and an easterly wave. Early forecasts predicted widespread heavy rainfall across several districts, including Theni, Dindigul, Madurai, and Ramanathapuram, during the Deepavali weekend. In Chennai, recent weather included the impact of cyclonic storm Murasu, which caused localized flooding in areas such as Pulianthope and Choolai.

By November 7, rainfall and wind conditions helped maintain satisfactory air quality levels in Chennai, with the Air Quality Index recorded at 72. Meteorological forecasts indicated continued thunderstorms and heavy rain across eight districts, including Thanjavur, Tiruvarur, and Nagapattinam, influenced by a trough extending from the southeast Arabian Sea towards south interior Karnataka.

## Timeline

### 2026-11-07: Rainfall and wind stabilize Chennai air quality ahead of Deepavali

Rain and wind have kept Chennai's air quality at satisfactory levels ahead of Deepavali, though heavy rainfall is forecast for several Tamil Nadu districts.

5 sources. https://clstr.news/cluster/rainfall-and-wind-stabilize-chennai-air-quality-ahead-of-deepavali

### 2026-11-03: Tamil Nadu faces heavy rainfall forecasts for Deepavali weekend

Tamil Nadu expects widespread heavy rainfall during the Deepavali weekend, affecting southern districts, the Cauvery delta, and the Western Ghats due to monsoon activity.

2 sources. https://clstr.news/cluster/tamil-nadu-faces-heavy-rainfall-forecasts-for-deepavali-weekend

---
Cite as: Weather patterns and rainfall in Tamil Nadu. CLSTR, https://clstr.news/situations/weather-patterns-and-rainfall-in-tamil-nadu