The Bangladesh Meteorological Department has issued cautionary signal No. 3 for the maritime ports as a deep convection has formed over the Bay of Bengal.
Squally winds generated by the convective clouds over the North Bay could affect the coastal areas in the south, Met Office said on Wednesday.
Chattogram, Cox's Bazar, Mongla and Payra ports have been asked to hoist the local single no.3, said Meteorologist Muhammad Abdul Kalam Malik.
All fishing boats and trawlers have been instructed to remain close to the coast.
The country is likely to experience rains for the next few days, said Met office.