The decision was taken by the Ministry of Islamic Affairs and Call as part of strict health measures to curb the spread of the highly contagious disease.
Those mosques were being sterilized, Al Arabiya added without specifying their locations.
Last week, Saudi Arabia reopened mosques except in Mecca, in line with a plan to gradually return to normal life.
Authorities have put in place a set of precautions for performing group prayers in mosques.
They include opening mosques 15 minutes before the Adhan and close them 10 minutes after the end of the prayer with the interval between the Adhan and the start of the prayer shortened to 10 minutes.
Worshippers are kept apart with a distance of two meters. Children under 15 are barred from going to mosques as a preventive measure.
Likewise, mosque classes and the Holy Quran memorization gatherings are suspended.
Worshippers have their temperatures checked before they are allowed into the mosques.
In March, the Kingdom closed the mosques as part of strict measures to curb the spread of the virus.