Reports from Lucknow said 40 people were killed in the heavy rains and related incidents across Uttar Pradesh.
Heavy rains accompanied by lightning hit many parts of the state on Tuesday.
Officials said two dozen people were killed in Varanasi and Azamgarh divisions while 11 died in Basti and Gorakhpur divisions.
Three people were killed in Kanpur after being struck by lightning and four people were killed in the Lucknow division.
Maximum casualties have been reported from Ballia (eight) followed by Ghazipur (six), Jaunpur (three), Mau (two), Sonbhadra (one).
One person each was killed in Azamgarh, Chandauli and Varanasi.
Three people were struck by lightning at Bharwalia village in Siddharthanagar.
Maharajganj reported one death, Deoria two persons and Kushinagar four.
Officials said relief operations were undertaken by district administrations and compensation would be paid to the families of victims.
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