
Parts of Tamil Nadu, including Chennai, are experiencing unusually high temperatures this September, with maximums remaining 4 to 5 degrees Celsius above normal in several areas. The Regional Meteorological Centre (RMC) in…
Parts of Tamil Nadu, including Chennai, are experiencing unusually high temperatures this September, with maximums remaining 4 to 5 degrees Celsius above normal in several areas. The Regional Meteorological Centre (RMC) in Chennai attributed the heat to a weak Southwest monsoon and lack of cloud cover this month.

Tiruchi recorded the state's highest day temperature of 39.5 degrees Celsius for the third consecutive day on Thursday. Chennai's Nungambakkam logged 38.1 degrees Celsius, the second-highest September reading in the city this decade, while Meenambakkam reached 38.5 degrees Celsius. Officials also cited the El Nino weather phenomenon as a contributing factor.
The RMC has predicted relief from Friday, with increased rainfall expected in north and interior Tamil Nadu, including Chennai and Vellore, due to a trough extending up to the Gulf of Mannar. Meteorologists said the break in monsoon conditions and lack of thundercloud development contributed to the sustained heat, and rainfall over the next few weeks may help narrow the deficit.
September is typically a rainy month for Tamil Nadu, as it falls in the latter half of the Southwest monsoon and precedes the Northeast monsoon, which brings the state's main rainfall from October to December. The current heat spike stems from a break-monsoon phase where the monsoon trough shifts away, causing dry spells even in normally wet periods. Chennai's all-time September record of 38.9 degrees Celsius, set in 1883, underscores how rare such heat is for this month. With the RMC forecasting rainfall from Friday, the key question is whether the coming wet spell will be enough to offset the deficit before the Northeast monsoon sets in around mid-October.
Source: thehindu.com
This brief was synthesised by AI from the source linked above.