Weather officials predicted more rains in the next 48 hours in India’s most populous state of Uttar Pradesh.
The deaths have been occurring since Thursday night, government spokesman Awanish Awasthi said.
Most of the victims died on Friday in Agra, the northern city where the white marble Taj Mahal is located,.
The dead included four members of a family whose house collapsed, he said.
Rains also damaged an outer boundary wall of a 16th century fortress west of Agra.
However, there was no damage to the main monument, said another official, PK Singh.
Mr Singh said schools were being closed.
The monsoon season usually lasts until October.
In 2016, floods caused by the monsoon rains killed more than 300 and affected 6 million people.