Heavy rains lashed Palghar and neighbouring Thane district since the last 30 hours, they said.
The five people drowned in nullahs and rivers in separate incidents, a senior district administration officer said, but did not elaborate.
The deceased have been identified as Sandeep Jadhav (42), Rajesh Bhosle (32) Aksah Rai (22), Sandeep Tandel (56) and Rabiulla Aliraja Shah (16), he said, adding Rs four lakh assistance will be provided to their kin.
Meanwhile, in Dahanu at least 50 houses were damaged due rains and the occupants were shifted to different camps.
Water logging was reported in areas like Ghodbunder road which affected vehicular traffic, they added.
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