The IMD has issued a rain alert for southern and eastern India on September 21.
Winds of 40 to 50 kmph, with gusts up to 60 kmph, are forecast for the affected areas.
Over the Bay of Bengal, winds could reach 45 to 55 kmph, gusting to 65 kmph.
Kerala is under a yellow alert.
Fishermen are advised not to venture out where winds are strong.
The states named include Tamil Nadu, Andhra Pradesh, Telangana, Karnataka, Kerala, Odisha, West Bengal, Bihar, Jharkhand, Chhattisgarh, Konkan and Goa, and parts of the Northeast.
Coastal Andhra Pradesh is expected to remain particularly wet, with warnings of heavy rain, thunderstorms, lightning and strong surface winds.
Isolated heavy rainfall is likely over Tamil Nadu, Puducherry and Karaikal, coastal Andhra Pradesh and Yanam, and Telangana.
Tamil Nadu, Rayalaseema and parts of Karnataka may also see thunderstorms with lightning and gusty winds.
Winds of 40 to 50 kmph, with gusts up to 60 kmph, are expected in the affected regions.
Over the east-central and adjoining north-east Bay of Bengal, winds of 45 to 55 kmph, gusting to 65 kmph, are expected.
Kerala could receive heavy showers over the next few days, and a yellow alert has been issued in parts of the state.
A yellow alert for Kerala indicates the possibility of heavy rainfall in the range of 64.5 mm to 115.5 mm.
Heavy rain is forecast at isolated places over the Andaman and Nicobar Islands and coastal Odisha, and isolated heavy rainfall is forecast over Chhattisgarh.
In Jharkhand, Ranchi is expected to see one or two rounds of showers and thunderstorms, with a maximum near 32 degrees Celsius and a minimum near 23 degrees.
Fishermen are advised not to venture into the Bay of Bengal where strong winds are forecast.
People in affected areas are advised to avoid open fields, trees and electric poles during thunderstorms and to check local bulletins before travelling.
Monsoon clouds in Bengal, India (representative image), Wikimedia Commons, CC BY 2.0
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