"I think we can say that the fire fronts are slowly coming under control," Yiannis Kontzias, mayor of the Evia town of Istiaia that has been under threat for days, told state TV ERT.
"Yesterday, we saw the light of the sun for the first time in days," he said, referring to giant smoke clouds that have choked residents and obstructed water drops by fire-fighting aircraft.
The situation was more precarious in the mountainous Peloponnese region of Gortynia, home to thick forests and deep ravines.
Christos Lambropoulos, deputy governor for the broader Arcadia region, said efforts were concentrated on keeping the fire from reaching the thickly forested Mount Mainalo.
"Villages do not seem at risk at the moment... but conditions change by the hour," he told ERT.
Three people have died in the latest fire wave, which came in the midst of Greece's most severe heatwave in decades.
Many here admit that help from abroad has been critical in averting an even greater disaster.
EU states and other countries have so far contributed 21 aircraft, 250 vehicles and more than 1,200 firefighters, some of whom were due to arrive by Friday.
There have been growing calls in Greece for the resignation of top public safety officials who as recently as June had insisted that the country was well-prepared.
"(Our resources were) stronger than ever before. We faced an operationally unique situation with 586 fires in eight days during the worst weather phenomenon in 40 years," civil protection deputy minister Nikos Hardalias insisted on Tuesday.
'We face extinction'
Greek prime minister Kyriakos Mitsotakis this week apologised to the nation for any possible "shortcomings" in the state's response. He is to hold a press conference on Thursday as pressure mounts for heads to roll.
In addition to hundreds of homes lost according to early estimates and the blow to Greece's dwindling forests, the cost to local economies is expected to be daunting.
"We face extinction," said mayor Kontzias in Evia, whose jurisdiction includes the popular spa town of Aidipsos.
"We have lost the month of August, which would have sustained people here in the coming year."
"Local tourism has been demolished, most (visitors) have left," he said. "The damage is huge, and the environmental disaster will have economic repercussions for decades," he said.