The minimum temperature was recorded at 8.6 degree Celsius, two degrees above normal, early this morning, the MeT Department said.
Fog descended on the capital this morning and the visibility fell to near zero level, they said.
The dense fog had some effect on the operations at the Indira Gandhi International Airport where around 15 flights were delayed.
The prevailing weather conditions also affected rail traffic delaying several trains in the capital.
Road traffic was slowed down due to fog and drivers switched on fog lights to negotiate through Delhi streets.
The Weatherman has predicted thunderstorms with rain tomorrow with temperature oscillating between 11 and 20 degree Celsius.