The blaze took hold in a dry pine forest in the Dirfyon municipal region at 3.20pm (local time) and isheading towards the evacuated villages, close to Athens.
Shocking video footage shows how forest fires have turned the city skyline orange.
The fires prompted the mass evacuation of Kontodespoti and Stavros village in central Evia, about 70 km (44 miles) from Athens, which was described as a precaution.
Mayor of Dirfia and Messapies, Giorgos Psaras, said: “The fire has a very wide front and is now at a pine forest, moving fast towards Psachna.
“Despite constant drops of water by aircraft and helicopters, it has been impossible to check its path.”
Greece’s Fire Service says 50 personnel, 21 vehicles, and four firefighting airplanes and helicopters are tacklng the fire to bring it under control.
Traffic between the Chalkida highway and North Evia, the island east of Attica, has been halted.
Officials have warned the area has low visibility due to the smoke.
It comes after wildfires near the capital killed 94 people in July, the country’s worst such disaster.
Officials say the wildfires are the worst to hit the country since 2007.
Witnesses reported seeing corpses, while shocking images have shown burnt-out cars and thick black clouds of smoke.
The devasting fires prompted Prime Minister Alexis Tsipras to replace the Civil Protection Minister and the heads of Fire Brigade and Police.
Regional Greek authorities also declared a state of emergency in the eastern and western parts of greater Athens as fires fanned by winds raged through pine forests and seaside towns.
Buses, water trucks and machinery are being provided to help battle the fires.
Mr Tsipras also announced the demolition of thousands of illegal buildings in response to the deaths of dozens of people who were unable to escape a maze of poorly planned streets.