Met Éireann has warned Storm Floris is set to bring a "blustery and a quite windy day tomorrow", as local authorities issue advice ahead of its arrival.
The forecaster has issued Status Yellow weather warnings, which are due to come into effect from early tomorrow morning.
Speaking on RTÉ's This Week, senior forecaster Gerry Murphy said there will be some heavy rain overnight, which will clear in the morning.
Watch: Senior forecaster Gerry Murphy tells of what to expect during Storm Floris
The most significant feature, he said, will be the winds, especially in western counties.
"There will be strong gusty west to north-west winds especially in western counties where we have those warnings from Clare all the way up to Donegal.
"It's just unseasonably windy."
While the weather is unlikely to cause severe damage in general, Mr Murphy said that given the time of year, with people camping, holidaying, or just using their garden umbrellas, they need to take care.
"Leaves are in full bloom, so strong gusty winds may bring down some branches."
Mr Murphy said Storm Floris is going to move to the north of Ireland.
"It is a storm that has been named by the UK Met Office because of the severe weather that it is going to bring to Scotland and they have issued an Amber warning for Scotland under their system."
Mr Murphy said for those people attending the Fleadh Cheoil in Wexford, the early morning will be windy in both Wexford and Waterford, but once the rain clears through the winds, it will be a "blustery fresh afternoon" and he added that "it is not going to be significant in the south-east".
The forecaster has issued a wind warning for counties Clare, Galway, Mayo and Sligo, which is valid from 2am tomorrow until 1pm.
A similar alert is in place for counties Cavan, Donegal, Monaghan and Leitrim, which is valid from 4am Monday until 4pm.
A Status Yellow rain warning will also cover counties Donegal, Galway, Leitrim, Mayo and Sligo.
This is valid from 2am on Monday until 10am.
The UK Met Office also issued a Status Yellow wind warning for counties Antrim, Armagh, Down, Fermanagh, Tyrone and Derry.
This alert is due to come into effect at 6am tomorrow and is valid until 6am on Tuesday.
Newry, Mourne and Down District Council has said the district's forests, country parks and trials will be "closed to cars and pedestrians" tomorrow.
This, it said, is due to "the increased likelihood and risks associated with falling branches and debris".
The council advised the public "not to visit our play parks, outdoor sport facilities and outdoor recreational areas" alongside coastal amenities such as beaches and harbours.
Cavan County Council said its crews will be "mobilised from early morning to deal with any emergency situations as they develop".
It advised road users to to keep vigilant for falling or fallen debris on roads, and urged cyclists and pedestrians to ensure they are visible to other road users.
Householders, it said, should secure large items such as lawn furniture or trampolines.
'Check in on isolated and vulnerable neighbours'
The council also asked people to "check in on isolated and vulnerable neighbours in advance of the oncoming severe weather and again after the worst of the event has passed".
Met Éireann said Storm Floris is expected to track over the northwest tonight and tomorrow, before moving over Scotland and clearing into the North Sea.
The storm, it warned, will "very strong and blustery southwest winds veering westerly, with some damaging gusts" alongside heavy rain and a chance of thunder.
It cautioned the potential affects of the storm may impact outdoor events and may cause dangerous travelling conditions, structural damage, trees to fall and debris.
It also warned of the possibility of power outages, wave overtopping, lightning damage and localised flooding.
Donegal council crews on 'standby'
Director of Emergency Services with Donegal County Council Gary Martin said the effects of the storm will be felt most keenly in the county from around 6am.
He added that its effects will mostly be felt along the Atlantic coast.
However, associated risks are being accounted for, he said.
"The combination of heavy rain and strong winds brings risks of localised flooding, difficult driving conditions, and possibly falling trees or debris, particularly since trees are in full leaf.
"We’re urging people to exercise caution, especially during the hours of darkness," Mr Martin added.
He said that while summer storms are not unheard of in the area, it’s unusual to see storms of this nature during the August Bank Holiday.
This, he said, could pose a particular risk to the hundreds of holidaymakers camping along the coast.
"For those visiting the county, in caravans, campervans or tents, we strongly advise making sure you’re in a sheltered area and not exposed to the storm."
"We have contingency plans in place. We’re a 24/7 service, and our teams, emergency and road services, are on standby."
"We’ve had several meetings over recent days, including with our Severe Weather Assessment Team, to ensure we’re prepared," he said.
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One tourist hotspot affected by the worsening weather conditions, Rossnowlagh, Co Donegal, which today was lined with hundreds of visitors, ahead of Storm Floris’ arrival later this evening.
Already, the storm has impacted the area’s seasonal businesses.
Speaking to RTÉ News, owner of the local Finn McCool’s Surf School Neil Britton said he has already cancelled all lessons, camps and rentals tomorrow as a matter of "public safety".
"From our point of view, the timing couldn’t be worse.
"We do get storms like this in the winter, but the danger this time is that it’s happening in the middle of summer, when we see a lot more recreational surfers who may not really know what they’re doing," Mr Britton said
"Our advice to surfers tomorrow is to talk to lifeguards, especially at blue flag beaches, and only go in the water if they say it’s safe.
"But in general, because this is such a big storm, it’s not going to be that much fun out there anyway," he added.
