Met Éireann is warning of ''potentially heavy thundery downpours''.
A status yellow rain warning is in place for all counties in Leinster and Munster.
The warning is valid until 6am on Friday and warns of potentially heavy thundery downpours.
Met Éireann is warning there is a risk of river flooding as there's been a lot of rainfall recently.
In terms of the weather for tomorrow and the weekend, it's a bit of a mixed bag.
Friday: Will be a cool, breezy and showery day. Rather cloudy to begin with scattered showers, some heavy, but it will tend to brighten up from the west later in the day with sunny spells developing. Highest temperatures of 14 to 17 degrees in fresh and gusty northerly winds, strong to near gale at the coasts.
Saturday: A mostly sunny start on Saturday will give way to a cloudier afternoon with more of a mix of cloud and sunny spells. It will be a largely dry day though, with just isolated light showers. Cool for the time of year with highs of just 13 to 16 degrees.
Sunday: Largely dry with mix of cloud and sunny spells and just the odd light shower possible. Rather cool again with highs of just 14 to 16 degrees.
