The national capital Delhi received the season's heaviest downpour this morning bringing much needed relief from the scorching heat. Although the rain brought down the mercury levels, but scores of people were left stranded for hours in traffic jams as many parts of the city were waterlogged. Traffic jams were reported at major intersections including ITO in central Delhi, Ring road, Laxmi Nagar and Mathura road while water logging took place at Bhogal, Delhi Gate,Najafgarh and Adarsh Nagar to Jahangir Puri.The Met office said the city received 54.5 millimeters of rain during the last 24 hours till 8.30 a.m. The sky will remain mainly cloudy today. Some spells of rain are likely in parts of Delhi with some places seeing heavy showers.