People are being advised to 'keep an eye on the rainfall radar' if they're planning outdoor activities this August bank holiday weekend.
Showers and cool weather are forecast across the country over the coming days.
Met Éireann says temperatures will be lower than expected for this time of year.
Meanwhile, scattered showers are expected in Atlantic coastal areas tomorrow morning, before becoming more widespread later on Saturday and throughout Sunday.
Monday is expected to be a mostly dry day, although with weather becoming increasingly cloudy as the day goes on.
Alan O’Reilly from Carlow Weather spoke to The Hard Shoulder about the outlook for the weekend.
He said: "It was actually 18 degrees in Dublin at 6am this morning - we'd do well to get 18 degrees at the peak for the rest of the weekend. That warm air is sinking away.
"It's going to feel much cooler tomorrow - it's going to be about 15 or 16 degrees in the West tomorrow... at a max.
"You'll want a jacket either way... unfortunately, showers are going to be the biggest problem."
Alan said anybody who doesn't have a rainfall radar installed on their phone should look at doing so if they're planning activities.
He explained: "There's going to be sunny spells - you'll feel like maybe you set the picnic table. [But] you'll go back inside to get something and you'll come out and all of a sudden everything is soaked.
"The showers will start off in the west, but as the day goes on they'll push across the country.
"Some of them will be heavy and some of them will be long enough as well. It is going to be hard to plan."
Alan said Monday will be mainly dry and the best day of the weekend, but it will 'cloud over during the day'.
He explained: "Tuesday is looking awful - really wet and windy day.
"If you're packing up the car to head off for a staycation... maybe Tuesday you want to plan the indoor events."
However, he did said it does look like the weather is going to pick up in the longer term after an often wet and cool July.