The quake was registered at 10:48 local time (06.18 GMT). No reports of destruction or casualties have been released.
On May 1, a 4.7-magnitude quake was registered in the country's western Lorestan province. About 100 people suffered minor injuries.
Iran is highly prone to earthquakes, and over 31,000 people have died in separate tremors in the country since 2003. In 2003, the city of Bam was hit by a quake measuring 6.6 on the Richter scale and in 2005 a quake of 6.4 shook the town of Zarand.