Thu May 08 19:46:14 UTC 2025: ## Tamil Nadu to See Isolated Rainfall, Temperatures to Rise Slightly Next Week

**Chennai, May 9, 2025** – Tamil Nadu can expect isolated rainfall and relatively normal temperatures this Friday, thanks to a north-south trough, according to the Regional Meteorological Centre (RMC), Chennai. While the Southwest monsoon is predicted to reach the south Andaman Sea and southeast Bay of Bengal by May 13th, its immediate impact on the state remains uncertain.

Recent recurring thunderstorms have prevented a significant temperature surge, keeping mercury levels closer to normal. However, a slight temperature increase of 2-3 degrees Celsius is anticipated from May 10th in some areas. Slightly enhanced rainfall is possible between May 12th and 14th, with the possibility of thunderstorms and gusty winds in several locations, including Chennai, on Friday.

Erode recorded the highest temperature on Thursday at 39.2 degrees Celsius, while Chennai’s Nungambakkam registered a below-average 35.3 degrees Celsius. Light rainfall was reported in Vellore and Mamallapuram.

RMC Head (additional in-charge) B. Amudha attributed the recent rainfall and lower temperatures to a wind discontinuity, a common April-May weather phenomenon. She noted that the Southwest monsoon’s arrival typically occurs via two branches – the Arabian Sea and Bay of Bengal – and that the department is closely monitoring cloud movements. The onset of the monsoon in Kerala could lead to temperature dips and increased rainfall in parts of Tamil Nadu. Last year, the Bay of Bengal branch of the monsoon arrived earlier than usual.

Y.E.A. Raj, a former deputy director general of meteorology, Chennai, added that long-range forecasts don’t currently predict an early monsoon arrival in Kerala. He also noted that past instances have shown heat subsiding in Tamil Nadu during early monsoon onset. A multi-model forecast indicates rainfall over the Arabian Sea between May 26th and June 1st, and below-normal temperatures are expected across most of Tamil Nadu this month.

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