Met Éireann has said that temperatures will fall in the coming days to around average for this time of the year, becoming noticeably much colder across the country.
Temperatures are set to drop from around 20 degrees today in Galway to around 12 degrees Celsius on Tuesday.
But tonight (Saturday) will remain very mild in the West, with lows not dropping below 13 or 14 degrees.
Patches of light rain and drizzle will continue overnight with any clear spells making way for clouds towards morning and it will also become breezy, in moderate to fresh southerly winds.
Tomorrow, Sunday, will see rain spreading eastwards across Connacht throughout the morning, becoming heavy at times.
The rain will gradually clear eastwards in the afternoon, followed by cooler, fresher conditions.
It will be blustery, with fresh and gusty southerly winds, easing light variable as the rain clears.
Highest temperatures on Sunday will be between 16 and 18 degrees, becoming noticeably cooler in the afternoon.
Monday will see another noticeable change in the temperature, with much cooler conditions forecast across Ireland.
It will be a fresher day, with a mix of sunny spells and heavy showers.
Met Éireann says that showers will be most frequent over the western half of the country with the potential for thunderstorms.
Highest temperatures will then fall back to around normal for this time of year, at 12 to 15 degrees.
As for Tuesday, it looks set to be another cooler and wet day, with widespread heavy showers or longer spells of rain developing.