Branches of trees are seen on a street at Benfica neigborhood as hurricane Leslie goes past in Lisbon, Portugal October 14, 2018.
The remnants of the storm hit the central and northern parts of the Iberian Peninsula, CBS News reported. However, the commander of civil defense White Luis Costa said that "the biggest danger behind".
Gale-force winds and flash floods were forecast from the US National Hurricane Center (NHC).
The wind speed reached 170 km/h was the most affected region of Leiria in the centre of the country.
The storm, carrying winds of up 100 km/h, was most intense during the night. Some flights were also cancelled or delayed.
The storm was about 85 miles south-southwest of Porto, Portugal and about 125 miles north of Lisbon, Portugal, the NHC said in a 5 p.m.
Portugal's National Protection Agency said over 300,000 people suffered power outages overnight after power lines were damaged across the country.
By Sunday morning the powerful winds and heavy rains had mostly subsided.
Hurricane Leslie had been meandering around in the eastern Atlantic for nearly three weeks before it suddenly raced towards Portugal, where no hurricane had been recorded.
The Portuguese Institute for Sea and Atmosphere (IPMA) said Leslie on landfall would loose intensity and pass to the category of "post-tropical storm".
Over the past 176 years, only Hurricane Vince has made landfall on the Iberian peninsula, hitting southern Spain in 2005, according to weather records cited by experts.
Leslie first became a sub-tropical storm almost three weeks ago on September 23.
Meteorological records indicate that only five hurricanes have ever arrived in this part of the Atlantic Ocean, and Leslie could turn out to be the fiercest storm to hit Portugal since 1842.