The Eid Al Adha holiday is likely to start on July 20.
The International Astronomical Centre said that the month of Dhu Al Hijjah, 1442 AH, is likely to begin on Saturday, July 10 at 5.17am UAE time.
An announcement by Muhammad Shawkat Odeh, the centre's director, was reported by UAE news agency Wam.
Mr Odeh said it would be possible to see the crescent moon on that day using a telescope from Arab countries, and with the naked eye from most countries in Africa and Europe.
Residents can expect a long public holiday around the religious festival, as Arafat Day is expected to fall on Monday, July 19.
This will be followed by a three-day break for Eid, taking the holiday up to Thursday, July 22, adding up to six days off for those lucky enough not to work the weekend.
Eid Al Adha is one of the most important dates in the Islamic calendar. Also known as the feast of the sacrifice, it coincides with the Hajj pilgrimage to Makkah.