The Safdarjung Observatory, which provides official figures for the city, recorded 28.8 mm rainfall till 5:30 pm Monday.
More than 65 mm precipitation at any place is considered heavy rain, officials said.
Heavy rain was reported in Central Delhi, East Delhi and some parts of neighbouring Noida.
From July 1 to July 15, the Safdarjung Observatory recorded 55.6 mm rainfall, 61.5 percent less than the 30-year average of 88.3 mm during the period, according to officials.
On Monday, the city recorded a high of 34.7 degrees Celsius, normal for this time of the year, and a low of 26.6 degrees Celsius.
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