Heavy rainfall accompanied by thunderstorms and lightning is expected at isolated locations in Tamil Nadu's Nilgiris district on 2 November 2026, as a weather system forming over the south Andaman region gathers strength and moves toward the mainland. The India Meteorological Department has issued a forecast covering several coastal and interior districts of Tamil Nadu over the next three days.

Weather System and Its Track

According to the Meteorological Department, a low-pressure area over the south Andaman region is expected to intensify by Saturday and shift toward the Andhra Pradesh coast within the next two days. The system's westward movement is projected to trigger varying spells of rainfall across coastal and interior Tamil Nadu as it progresses.

Day-by-Day Forecast for Tamil Nadu

On 1 November, moderate rain accompanied by strong winds is likely in the northern coastal districts and districts adjoining the Western Ghats. The forecast also covers Madurai, Tiruchi, Namakkal, Salem, Erode, and Karur, indicating shower activity across several interior districts. Light rainfall is expected in districts along the Western Ghats and coastal Tamil Nadu — including Chennai — on Saturday, while dry weather is likely to prevail across other parts of the State.

By 2 November, the outlook shifts notably toward the Nilgiris, where heavy rainfall with thunder and lightning is anticipated at one or two locations. Elsewhere in Tamil Nadu, moderate rain accompanied by strong winds remains likely at isolated places, the department noted.

Deepavali Rain Possibility

Chennai Regional Meteorological Centre Director Durai said several places in Tamil Nadu could receive moderate rainfall on Deepavali day. His remarks highlighted the prospect of festival-day showers alongside the department's immediate three-day forecast. Durai also noted that northeast monsoon rainfall had so far been 37 per cent above normal for the season to date — a figure he cited while discussing prevailing weather conditions.

Broader Monsoon Context

The above-normal monsoon performance this season underscores a pattern of intensified rainfall events across southern India, particularly in hilly and coastal zones. The Nilgiris, with its steep terrain and high rainfall sensitivity, is consistently among the first districts to receive heavy precipitation when systems approach the peninsula. This comes amid a broader trend of the northeast monsoon delivering stronger-than-average spells in Tamil Nadu in recent years.

Residents in the Nilgiris and northern coastal districts are advised to monitor updated forecasts as the weather system evolves over the weekend.