St Patrick's Day is set to be cold and windy, with some places having scattered showers of sleet or snow.
Met Éireann has warned that very cold and breezy weather is expected to continue over the holiday weekend.
There will be occasional wintry showers, mainly in eastern areas. However, much of the country will be dry, with good sunny spells over coming days.
A weather advisory from Met Éireann yesterday warned of cold conditions and scattered showers of sleet or snow, with a risk of snow accumulations of up to 3cm between today and Saturday evening.
St Patrick's Day parades will be taking places in many cities and towns tomorrow. Road closures, traffic diversions and alternative transport arrangements will be in place.
The organisers of the Dublin parade expect 700,000 people to line the streets to watch 3,000 people taking part in the "piece of moving theatre" which leaves Parnell Square at noon. International and Irish marching bands will join performers, dancers and street theatre companies.
Gardaí in Dublin have advised people attending the parade that there will be restricted viewing on O'Connell Street due to road works.
No viewing is permitted on the median strip from the Spire to the Royal Dublin Hotel or on O'Connell Street Upper east side from Flanagan's restaurant to Cathal Brugha Street.
In Dublin, some traffic restrictions will be in place from as early as 7am.
In Cork, a park-and-ride facility from Black Ash will operate tomorrow from 9am until 7.15pm to coincide with the parade. This will begin at South Mall at 1pm.
In Limerick, the parade is taking a new route, beginning at noon at Matthew Bridge. Galway's parade starts at 12.30pm.
The parade in Waterford city is due to commence at 1pm, and restrictions will be in place to allow it to pass from Merchants Quay to the People's Park. Half Moon Street, Academy Street and Emmet Place will be closed from 9am to 5pm to facilitate a food and craft market.