In a regular bulletin, the Bangladesh Meteorological Department (BMD) said temporary gusty wind is likely to occur at many places over Khulna, Barishal and Chattogram divisions during the rain.
The BMD predicted heavy to very heavy falls at places over the southern part and one or two places over Rajshahi, Rangpur, Mymensingh, Dhaka and Sylhet divisions.
Also read: Rain, thundershowers likely
A low pressure area has formed over the North Bay, it said adding that the axis of monsoon trough runs through Rajasthan, Madhya Pradesh, Bihar, West Bengal to Assam across the central part of Bangladesh.
Monsoon is fairly active over Bangladesh and moderate to strong over the North Bay, the Met Office said.
Day temperature may rise slightly over northern part, the BMD said, noting that it may remain nearly unchanged elsewhere over the country.
Night temperature may also remain nearly unchanged.