The two deaths by lightning occured at Puliyangudi district in Tamil Nadu, police said.
Tirunavukarasu (26) and Dhanaksekharan (33) were standing under a tree when lightning struck them. Both died on the spot.
One other person who was also taking shelter under the tree due to heavy rains suffered serious injuries.
It was a sunny day in the national capital with the minimum temperature recorded at 25.2 degrees Celsius, a notch below the season's average.
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The city did not receive any rainfall today. The humidity level oscillated between 92 and 58 per cent.
Meanwhile, the flood in Assam spread to newer areas in Dhemaji district today with over 41,000 people affected in six districts in the state.
According to a report by Assam State Disaster Management Authority (ASDMA), more than 41,000 people are affected at present in six districts - Dhemaji, Chirang, Morigaon, Nagaon, Golaghat and Cachar districts.
Till yesterday, over 41,500 people were affected by the latest wave of flood across five districts - Chirang, Morigaon, Nagaon, Golaghat and Cachar.
With these, the total number of people losing their lives in this year's flood related incidents in Assam went up to 158, including eight in Guwahati.
As per the report issued today, Nagaon is the worst affected with 23,500 people, followed by Morigaon with over 12,500 people affected in the deluge.
Currently, 149 villages are under water and over 5,500 hectares of crop areas are inundated, ASDMA said.
Authorities are running 25 relief camps and distribution centres in five districts, where 6,630 people are taking shelter at present.
The flood situation in Bihar continued to show signs of improvement with no fresh reports of any casualty from flooded areas of the state.
Water is receding in several places and people are returning to their homes. Around 11,633 people are staying in 35 relief camps, a Disaster Management department release said.
The death toll in this year's flood in Bihar stands at 514, it said.
The situation in flood-ravaged districts of eastern Uttar Pradesh is also slowly crawling back to normalcy, officials said.
The flooding in 24 districts of eastern UP affected 27.92 lakh people this year.
A number of deluge-affected people continue to put up in relief camps.
The state government is running 279 flood outposts and 72 centres for distribution of relief material, the officials said.