Chennai registered a maximum temperature of 42.7 degrees Celsius at Meenambakkam on Tuesday, 4.3 degrees above the normal.
At Nungambakkam, it was 41.8 degrees, 4.4 degrees above normal. This is the third consecutive day that the maximum temperature settled above 40 degrees here.
As Chennai braces for worse, a government advisory has asked people to step out only if it's absolutely necessary. It added that people should wear a cap or use an umbrella and hydrate well.