Met Eireann has issued a code yellow warning with strong to gale force winds of up to 90km/h expected today.
It says winds may occasionally gust up to 100 km/h along parts of the West and Northwest coasts. Southwest to westerly winds are expected along parts of the west and northwest coasts of Ireland. It will also be very showery today, leading to heavy rain and in some cases thunder.
The Met Office in Britain has also issued a warning to millions of people in Wales and southern England to expect hurricane force winds overnight. It there said winds in excess of 130km/h could bring down trees and cause structural damage, leading to power cuts and transport disruption.
The storm will develop over the Atlantic and is expected to hit the south-west of Britain before moving north-eastwards.