Saudi Supreme Court announced the first day of the Islamic holy month of fasting will now start on Thursday, May 17.
Pan-Arab television news channel Al Arabiya stated bad weather and dust had made the observation difficult.
If spotted, people were urged to report it to the nearest court.
Each year, Ramadan begins 10 to 12 days earlier as it is based on the lunar calendar.
The thin crescent moon marking the beginning of a new month in the Islamic calendar is called Hilal and is used to predict the start of Ramadan.
The fast is intended to help people learn about self-discipline and restraint while also empathising with those who have less.
Muslims wake up before dawn, which is known as Sehri, to eat their first meal of the day.
Communities and families then gather at sunset for Iftar, the time when the daytime fast breaks.
It is considered the holiest time in the Islamic calendar and is one of the five pillars of Islam, which are the foundation of the religion.
Ramadan is a time for prayer, reflection and religious devotion, to cleanse past sins.
If people break their fast during the day, they are required to make up for the lost days after Ramadan.
Because the celebration will begin late, this will mean Eid Al-Fitr will most likely begin on Friday, June 15 to mark the breaking of the fast.