The Bangladesh Meteorological Department forecast temporary squally or gusty winds, rain or thundershowers in seven districts from 9pm on August 6 to 9am on August 7.
Winds may blow from the south or southeast at 45 to 60 kilometres an hour, the department said.
The areas named in the forecast are Faridpur, Barishal, Patuakhali, Noakhali, Cumilla, Chattogram and Cox's Bazar.
River ports in those areas were advised to display local cautionary signal No. 1.