The lightning struck at various places across the district, causing damage to a temple and a bungalow in Thane city, Palghar District Disaster Control Officer (DDCO) Vishwajit Kadam said.
The deaths due to bolts from the sky were reported in Manor, Kev and Kasrud villages in the district.
The deceased are identified as Sangeeta Sutar, Ekanth Shelar, and Bharat Pardhi.
At least thirteen people were injured in separate incidents of lightning strike in Manor and Mhaskarpada villages while two persons were injured in a similar incident in Kallalepada hamlet in Boisar taluka of the district, Kadam said.
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In Palghar town, the wall of a bakery collapsed due to heavy rain, but nobody was injured in the incident.
At Tembikhodave hamlet, part of a temple was damaged in the lightning strike.
At Makunsaar village, electricity polls collapsed due to heavy rains.
Palghar District Collector said that the administration is closely monitoring the situation and is coordinating with various agencies.