Ireland is set for a mixed weekend, with an 8C temperature difference likely between Saturday and Sunday.
Dublin will enjoy the best of the conditions, with Saturday set for sunny spells and temperatures of up to 21C.
However, Met Eireann's Gavin Gallagher said Sunday will be a stark contrast, with most areas struggling to see temperatures reach double digits, with highs, even in sunny parts of the east coast, of only 12C to 13C.
There will be much cooler weather in the early part of next week - far colder than normal for this time in May.
Despite the lower temperatures, the weather will prove largely dry and settled as a large Atlantic high pressure zone sits off the west coast.
"Today will see a mostly cloudy start, with showers developing through the day," Mr Gallagher said
"Some will be heavy, mainly in the north midlands and Ulster in the afternoon, with sunny spells developing also and highs of 15C to 17C.
"Friday will see scattered showers developing across the north and west, but there will be sunny spells too, with the best initially in the east, becoming brighter in all areas later."
Temperatures will reach 19C in Dublin and parts of the east coast tomorrow - a flavour of the fine sunny spells likely on Saturday. At times, temperatures will reach 20C or even 21C on Saturday, although some areas will experience scattered showers.
Saturday evening will witness a dramatic drop in temperatures.
"Sunday will be noticeably cooler in all areas. It will be dry with a mix of cloud and sunny spells," Mr Gallagher added.
"However, temperatures will struggle to get to double figures in many areas.
"There will be highs of only 7C to 10C in the north and 10C to 13C in the south and east."
The forecast next week is for cloudy conditions with patches of bright sunshine.
Temperatures will be between 10C and 13C - much cooler than normal for early May.