In the national capital, it was cloudy and sunny in patches. The maximum temperature settled at 43 degrees Celsius, three notches above the season's average.
The minimum temperature was recorded at 34.2 degrees Celsius.
The humidity level oscillated between 46 and 26 per cent.
In Assam, over one lakh people were affected by floods in Lakhimpur and Karimganj districts while four rivers are flowing above the danger mark across the state.
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Karimganj is the worst affected with nearly over 97,000 people affected by the floods, while more than 4,500 were hit in Lakhimpur, the report said.
Currently Dhansiri river is flowing above the danger mark at Numaligarh in Golaghat, Barak at Badarpurghat in Karimganj, Katakhal at Matizuri in Hailakandi and Kushiyara at Karimganj town are flowing above the normal level.
Heat wave conditions continued to prevail in most parts of Haryana and Punjab.
The residents of Ludhiana too experienced a hot day with the maximum temperature being 42.4 degrees Celsius. Amritsar's maximum temperature settled at 41.2 degrees Celsius.
Chandigarh recorded a high of 41.5 degrees Celsius.
In Haryana, Hisar registered a high of 42.6 degrees Celsius.
In Rajasthan, mercury fell by up to three degrees Celsius at most places due to southwest monsoon progressing upwards north and western disturbances, MeT officials said today.
Churu recorded a maximum temperature of 43.5 degrees Celsius.
Rainfall was recorded at some places in the state. These places are: Gorakhpur, Varanasi, Bahraich, Sultanpur, Jhansi, Basti, Ghazipur and Orai.
Etawah was the hottest district in the state, where mercury touched 44 degrees Celsius.
In Jharkhand, four children were killed and two seriously injured when lightning struck them at Mundaro village in Giridih district, police said.
The children were all playing cricket and had taken shelter under a tree as rain accompanied by thunderbolt struck the area, Sub-Divisional Police Officer Deepak Sharma said.
Light to moderate rainfall occurred at many places in Bihar.
Bhagalpur recorded the highest maximum temperature at 37.5 degrees Celsius.
The state capital received 0.2 mm of rainfall.
In Odisha, mercury breached the 40 degrees Celsius mark at four places.
Titlagarh recorded a maximum temperature of 40 degrees Celsius, it said, adding that both Balangir and Sonepur recorded a maximum temperature of 42.2 degrees Celsius.