Torrential rains and thunderstorms have killed at least 63 people in southern India, and flooded dozens of villages, officials said Thursday.

Worst hit was the state of Andhra Pradesh where 48 people died in the last four days, said Dharmana Prasad Rao, a state government minister. At least 19 were killed by lightning, while the rest drowned or died when buildings collapsed, he said.

Overflowing rivers left about 50 villages under water, and authorities evacuated some 20,000 people from low-lying areas to relief camps.

In the neighboring state of Karnataka, heavy rains killed 15 people, C.N. Seetharam, a senior government official told the Press Trust of India news agency. Dozens of people were evacuated in the state, some by helicopter, PTI reported.

Monsoons usually hit India from June to September. This year they have been particularly deadly, killing more than 2,200 people, most of them in northern India.

More rain was forecast for the next two days.