Met Eireann has issued a Status Yellow rain warning for Ireland this weekend.
Saturday night and Sunday morning will see the worst of the downpours and flooding risks.
The alert is in place from 9pm Saturday until 12noon Sunday.
The forecast for Ulster counties says it will turn “very wet” on Saturday night and potentially quite windy also.
“Clear spells and scattered showers at first, but rain accompanied by strengthening winds will sweep northwards over the country. The rain will turn heavy bringing a possibility of localised flooding. There is the potential for strong winds for a short period. Lowest temperatures of 7 to 12 degrees.”
Sunday will be a breezy day with sunny spells and some scattered showers.