In neighbouring Portugal the number of fires dropped and authorities there were looking at the possibility of sending extra help to Spain.
The Spanish government says that the situation in Galicia remains delicate and would do so until the weekend because of high winds and temperatures.
Ames, a village near Santiago de Compostela, was partly evacuated while the motorway linking Pontevedra and La Coruna was closed for some 10 kilometres because of the threat of fire.
The port of Vigo in Pontevedra province, the hardest-hit by the blazes, was reported to be under a thick pall of smoke and ash from fires burning about 50 kilometres away.
Local authorities advised against physical exercise in the open air and counselled people with breathing problems to stay indoors.
By late morning Thursday 109 blazes had been recorded in Galicia, 63 them out of control.
The authorities say they are dealing with a "wave of deliberate fires" and have arrested five people since Monday.
Rewards and special protection have been offered to people giving information about those starting the blazes.
Police say that at the origin of the fires are conflicts between farmers and their neighbours, professional resentments, real estate and forestry interests and psychological troubles.
Fire casualties
Three people have died in the last six days and 10,000 hectares have been burned, according to provisional assessments.
In all 5,000 firefighters have been deployed, alongside 1,200 troops drafted in to help with evacuations and deter fire-starters. A total of 40 aircraft and helicopters have been put into service.
The crisis is easing in Portugal and the government there is considering sending extra aid to Spain if the lull lasts.
About 200 Portuguese firefighters were battling three major outbreaks, according to local civil defence officials, but the drop in the number of fires, from 26 earlier in the week, made it possible to step up aid to Spain.
Portugal has already sent 60 firefighters and 19 vehicles north to
Galicia. France and Italy have also answered a Spanish appeal for help from its EU partners to put out the blazes.