Rainfall measured 41.6 millimetres at Safdarjung, the highest in four years for October.
Minimum temperature reached 18.7 degrees Celsius, cooler than usual.
Several areas experienced waterlogging, leading to traffic diversions on major roads.
A yellow warning was issued, forecasting thunderstorms, lightning and winds up to 40 kilometres per hour.
Forecasters expect cloudy skies with more light rain for the rest of the day.
The temperature fell to a low of 18.7 degrees Celsius, about 2.3 degrees below the normal October average.
Waterlogged streets caused traffic to be redirected, and the India Meteorological Department kept a yellow warning for possible gusty winds of up to 40 kilometres per hour.
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