In the national capital, it was a humid day with the maximum temperature settling at 40.1 degrees Celsius.
The minimum temperature was recorded at 26 degrees, a notch below the season's average, said a MeT department official.
The humidity level oscillated between 79 and 26 per cent.
Rainwater entered nearly 200 houses in low-lying Greenfield area in the tourist town of Udhagamandalam in Tamil Nadu, following heavy rains that lashed for nearly two and half hours.
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With the South West Monsoon becoming active over Kerala, the state and union territory of Lakshadweep received heavy rains.
The highest amount of rain was received in Vadakara in Kozhikode (8 cm), while Minicoy (Lakshadweep) and Mavelikkara (Alapuzha) received 7 cm rains each, an IMD bulletin said.
In Haryana and Punjab, the maximum temperature hovered close to normal level. UT Chandigarh recorded maximum temperature of 39.8 degrees Celsius, as per the MeT department report.
In Punjab, Amritsar recorded maximum temperature at 41.1 degrees Celsius.
In Rajasthan, mercury showed an upward trend in most of the places.
Barmer was recorded as the hottest with 45.8 degrees Celsius followed by 45 degrees Celsius in Jaisalmer, 44.3 degrees Celsius in Ganganagar, and 44 degrees Celsius in Churu.
In the last 24 hours, Girva (Udaipur) received 4 cm rainfall and Abu Road (Sirohi) registered 2 cm rain.
In Odisha, the mercury breached the 40 degrees Celsius mark at five places.
At least 16 heat-related deaths have been reported in the state so far this summer, said the office of the Special Relief Commissioner (SRC).
In Bihar, mercury showed a rising trend with Gaya being the hottest place at 42.3 degrees Celsius.
The maximum temperature in Patna was 39.4 degrees Celsius, state MeT office bulletin said.