Already the storm has claimed the life of one person.
Two people were killed in separate incidents when trees fell on their cars - a woman in her 50s in the south east and a man on the east coast.
Three people died yesterday as hurricane-force winds were recorded across the United Kingdom, with Ireland being among the worst hit areas. The schools will remain closed for a second day, although most of the public transport services are back on.
It has issued a "status red" weather alert. "Even after the storm has passed there will still be dangers".
Ireland and Northern Ireland bore the brunt of the storm as it battered the British Isles, with around 245,000 homes and businesses still without power in the republic.
Royal Bank of Scotland Group decided not to open its Ulster Bank branches.
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In another precaution, Monday night's soccer game between Cork City and Derry, which has the potential to be a title decider, has been postponed and court hearings were deferred.
Ophelia is one of the strongest post-tropical system to rake Ireland since Hurricane Debbie in 1961, which killed 18 people.
STORM Ophelia continued to wreak havoc today as commuters were hit by delays as several rail lines were blocked by fallen trees and strong winds caused damage to buildings.
Ophelia could damage the Trump family's golf resort near the village of Doonbeg in Clare.
The Met Office said smoke particles carried north by Ophelia from wildfires in Spain and Portugal, which grounded a number of flights on Monday, could also return tomorrow.