At least 104 people have been killed by lightning strikes as heavy monsoon storms swept India's eastern and northern states of Bihar and Uttar Pradesh.

Officials say 83 of the victims were killed across various districts in Bihar, according to officials at the disaster management control room in state capital Patna.

"The deaths have been reported just as the monsoon arrived in Bihar and neighbouring regions. The victims were mostly farmers or the homeless who were outdoors," disaster management official Umesh Singh said.

Several others were injured as high-speed winds and rains felled trees and electricity poles and brought down thatched homes and temporary structures.

Dozens of people die from lightning strikes in the region every year during the storms which are common in India during the monsoon season that stretches between June and September.

The weather bureau has forecast more storms in India for the coming days.

Source: 9News