Coimbatore Leads Tamil Nadu’s Northeast Monsoon Rainfall Chart with 142% Excess

Coimbatore: Coimbatore has recorded the highest rainfall departure among all districts in Tamil Nadu and Puducherry, receiving 313.4 mm of rainfall against the normal expected 129.5 mm between October 1 and 26, 2026, an excess of 183.9 mm, or 142% above normal, during the ongoing Northeast Monsoon.

The figures show that Coimbatore has received more than twice its expected rainfall for the period, the highest departure recorded anywhere in the region during this stretch of the monsoon season.

Across Tamil Nadu and Puducherry as a whole, 215.4 mm of rainfall was recorded against the normal expected 136.3 mm, marking a 58% excess during the same period. Rainfall departure refers to the percentage difference between the actual rainfall received and the normal rainfall expected for the same period, based on historical averages, with a positive departure indicating more rainfall than normal and a negative departure indicating a rainfall deficit.

Tirunelveli ranked second among the districts with 254.8 mm against the normal 114 mm, recording a 123% excess. Karaikal received 401.7 mm against 183.6 mm, marking a 119% excess. Dindigul recorded 328 mm against 157.7 mm, an excess of 108%, while Kallakurichi received 261.6 mm against 128.5 mm, registering a 104% excess.

Other districts recording large excess rainfall included Tiruvannamalai at 98%, Ranipet at 96%, Erode at 95%, Namakkal at 93% and Perambalur at 92%.

The data highlights the substantial rainfall received across Tamil Nadu during the first 26 days of October. While most districts recorded rainfall above normal, Puducherry reported a 9% deficit, and Thanjavur recorded a 12% deficit.