The India Meteorological Department (IMD) recorded 26 mm of rain Friday morning.
Office goers had a harrowing time as streets flooded and long rows of vehicles were caught in traffic snarls at all major roads.
"I left home at 8 a.m. and have been stuck in traffic for last two hours," said Shweta, whose office is in Jasola.
"Its a nightmare, traffic is not moving. Even friends who had to take metro said reaching the station was very difficult," said Rashid, a resident of Noida, abutting Delhi.
Minimum temperature early Friday was recorded at 21.5 degrees Celsius, average for this time of the year.
Humidity at 8.30 a.m. was 100 percent.
IMD has forecast a generally cloudy day with more rain ahead.
"Sky will remain partly cloudy, more rainfall is expected in the day," an IMD official said.
Maximum temperature during the day will be around 33 degrees Celsius.