Eid-ul-Fitr is expected to fall on August 31 in Pakistan, keeping the tradition of 29 days of Ramazan alive.
According to the MET office, the first moon of Shawwal is expected to be visible on the eve of August 30.
The position and angles of the new moon at the time of the sunset are also favourable for moon-sighting on that day, said the MET office.
There have only been a few occasions in past the five years when 30 days of Ramazan have been observed in Pakistan.
The first moon of Shawwal will be visible in Khanpur, Bahawalnagar, Karachi, Hyderabad, Thatta, Badin and in the coastal areas of Pasni in Balochistan.
Most Muslim countries which started Ramazan on August 1 will also observe 29 days of Ramazan.
The MET office has predicted dry weather on Eid day.