This rain follows weeks of heatwaves: temperatures recently dropped to a cooler 31 to 32 Celsius during the day.
The sudden change is thanks to a western disturbance mixing with local weather systems.
Bikram Singh, director of IMD Mumbai, has flagged possible hail in Marathawada, Vidharbha, and Madhya Maharashtra.
Usually March is dry here; this wet spell means cooler days ahead.