People are dying from extreme heat, which is also killing a large number of chickens and destroying tea plants
The day, observed to mourn Imam Hussein Ibn Ali, the second grandson of Prophet Muhammad who was killed in the Battle of Karbala in 680 AD, will be a public holiday.
The Islamic Foundation in a media statement on Sunday said the National Moon-Sighting Committee announced the date for Ashura after a meeting.
It is mostly Shia Muslims who observe the day in Dhaka and across Bangladesh by taking out Taazia processions and engaging in self-flagellation.
In the traditional processions, devotees lacerate themselves with sharp weapons to demonstrate their grief and echo the sufferings of Imam Hussein.
Muslims in the country will observe Ashura a day after the Durga Puja, the biggest Hindu religious festival.