The worst fire scorched Vila Nova de Cerveira in the northern Minho region and was continuing to spread due to "difficult to access terrain, wind, high temperatures and the ongoing drought," a fire service spokesman said yesterday, with 250 men battling the blaze.
Portuguese television broadcast images of frightened residents as the flames approached their homes.
Another major fire was raging at Miranda do Corvo, not far from the central city of Coimbra, with homes there also threatened.
After having escaped relatively unscathed by wildfires last year, Portugal has been hit by major forest fires this summer.
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Nearly 80 per cent of the country's territory is considered to be in a severe drought, a situation that is likely to get worse in August, according to the Portuguese meteorological agency IPMA.
Portugal also contributed about 100 firefighters and dozens of vehicles to the battle against a wildfire in Estremadura in western Spain that ravaged nearly 6,500 hectares (16,000 acres), but which was brought under control yesterday.
Wildfires have destroyed more than 54,000 hectares of agricultural and forest land in Spain this year, exceeding the area burned over the last two years combined, according to the agriculture ministry.