May 2021 looks like it will be considerably colder than normal for Ireland. There could be even some snow on Thursday over high ground as temperatures will be in the single figures. There will also be frosts at night and lows below 0c.
It also appears as if May 2021 is going to be wetter than normal with more Low pressure systems returning to our shores from the Atlantic.These are going to bring unsettled conditions with rain or showers for Ireland on many of the days of May.
There really is no strong signal for any warm settled spell until possibly the end of the month and confidence on this is low.
Europe has also experienced a colder than average Spring with rain and snow and widespread frosts.