The Met Office has forecast light to moderate rain for Thursday, when Muslims in Bangladesh will celebrate their biggest religious festival, Eid-ul-Fitr.
Many parts of the country have experienced drizzle in the past few days.
Senior Meteorologist Abul Kalam Mallik said that capital Dhaka may face light rain on Thursday, but light to moderate showers were likely in other areas.
He said the inclement weather was likely to last for another two days, but situation could improve from Saturday.
The Met Office on Wednesday also asked all seaports to hoist cautionary signal No. 3 due to a seasonal low over the Bay of Bengal.
Keeping with past years, the main Eid congregation in Dhaka will be held at the National Eidgah Maidan at 8:30am Thursday.
There will be separate places on the ground for women and foreign envoys and diplomats joining the prayers.
The main congregations in Khulna and Rajshahi will be held at 8am and in Chittagong, Sylhet, Barisal, and Rangpur at 8:30am.
The prayers in all the mosque and Eidgah grounds across the country are also scheduled to take place by 9am.
In the weather forecast for Thursday, the Met Office said, apart from Dhaka, light to moderate rain or thundershowers accompanied by gusty wind was likely to occur in Rajshahi, Rangpur, Mymensingh, Khulna, Barisal, Chittagong and Sylhet.