Met Éireann has issued a status yellow rain warning for counties Cork, Waterford and Wexford, which will come into place from Sunday (September 29) at 12:00a.m.
The warning will remain in place until 12:00a.m on Monday, September 30, with persistent rain, which may become heavy at times, according to Met Éireann.
The national metrological service has warned of localised flooding; poor visibility; and difficult travelling conditions.
A Status Yellow gale warning will also be in place from Howth Head to Dungarvan to Slyne Head and on the Irish Sea South of Anglesey.
This warning will come into place from 3:00p.m and remain in place until 8:00p.m, with southeasterly winds expected to reach gale force 8 at times.
Overall for the rest of the country, there will be rather mixed weather over the next few days and quite cold too for this time of year.
Heavy rain
Rain will be heavy in parts, and will spread up from the southwest, over much of the country during Saturday night and Sunday, reaching the north coast Sunday afternoon.
There will be fresh to strong and gusty easterly winds with some spot flooding expected. Highest temperatures will be at 11° to 15°.
Soil moisture deficits are beginning to decrease across the country. As of yesterday, the deficits over the east and midlands ranged from 30-40mm but these will have declined significantly today owing to the heavy rainfall.
Elsewhere, soil moisture deficits generally range from five till 20mm. Over the coming week, there will be a reduction in deficits in all areas, especially in the east and southeast.