Met Éireann has issued a high temperature warning for all of Ireland tomorrow.
The warning states that maximum temperatures could reach in excess of 27C and are likely to drop no lower than 15C at night.
It will come into effect from midday tomorrow and last until 6am on Sunday.
Potential impacts include water safety issues at lakes and beaches, the "possibility" of forest fires, uncomfortable sleeping conditions and heat stress.
Status Yellow warning in place
It comes as a Status Yellow high temperature warning has come into effect for 14 counties.
Here are the maximum air temperatures recorded at our synoptic weather stations today🌡️ pic.twitter.com/GWL0xv5wMk
— Met Éireann (@MetEireann) July 11, 2025
The warning is in place for Carlow, Dublin, Kildare, Kilkenny, Laois, Longford, Louth, Meath, Offaly, Westmeath, Cavan, Monaghan, Roscommon and Tipperary and is set to last until 6am tomorrow morning.
Met Éireann has forecast maximum temperatures in excess of 27C combined with night-time minima in excess of 15C.
It warned the public of water safety issues due to the increased use of lakes and beaches.
Uncomfortable sleeping conditions and heat stress were also listed as potential impacts of the high temperatures.
The forecaster added that forest fires are a possibility.
A separate Status Yellow warning for the entire country will come into effect tomorrow at midday and will last until Sunday at 6am.
A third warning will come into effect on Sunday afternoon affecting 17 counties, mainly in the midlands and west of the country.
Watch: Met Éireann's Gerry Murphy says temperatures to approach record levels
Senior Forecaster with Met Éireann Gerry Murphy has said that temperatures will approach record levels for July, but perhaps will not reach them this weekend.
He said that across the country, temperatures will reach 29C and possibly touching 30C.
Mr Murphy said that the current temperatures represent a hot spell rather than a heatwave, as it will last only four days getting cooler next week.
He said that the midlands will be the hottest part of the country, counties Westmeath and Roscommon in particular.
Temperatures reached 27C in Oakpark in Carlow already today, Mr Murphy noted.
"Saturday will be the hottest day, we can expect temperatures to exceed 30 degrees," he said.
It will still be hot on Sunday in eastern areas and the midlands, Mr Murphy said, adding that temperatures will be dropping back a little in Munster.
He said that all of the country will have temperatures in excess of 27C or 28C and pointed out that the record for July was 33C in 2022 recorded at the Phoenix Park in Dublin.
Swimmers urged to exercise caution during hot spell
The RNLI has warned people planning to head for a swim during this weekend's hot spell to urge caution and to be aware of rip currents.
Temperatures this weekend could reach near Ireland's all-time highs as Met Éireann has forecast temperatures in the "low 30s" for parts of the country.
The highest recorded temperature dates back to 1887, when Kilkenny Castle hit 33.3C, and forecasters are predicting that Saturday's temperatures could come close to this.
Water Safety Ireland has warned that amid the sunshine and rising tides, the risk to people also goes up.
They have urged people to enjoy activities in and around water responsibly.
The RNLI's Water Safety Lead has also advised people heading for a dip to go to a lifeguarded beach, because they will have checked for rip currents that morning and will put up flags in areas safe for swimming.
Speaking on RTÉ's Morning Ireland, Linda-Gene Byrne said rip currents are "very, very dangerous and very hard to spot".
She advised people to stand in the water, if possible, and try to wade out to the sides of the rip current. However she said that if people cannot stand, then they should "float to live".
"Try and relax and breath," she said.
"Move your hands and legs and float. That fast moving water will bring you back out but it will eventually start to dissipate as it goes out so you'll be able to go out to the side of the rip, parallel to the shore."
Ms Byrne advised not to swim against the rip and if someone is taken out, they should put their hand up and shout for help.
She advised anyone on the shore who spots someone in trouble in the water not to try and rescue them. Instead, they should ring 999 or 112 and ask for the Coastguard.
Ms Byrne said it is important to use your voice to reassure the person in trouble and she would always advise going to a beach that has a lifeguard on duty.
She said people who are new to the area should chat to locals to get an idea as to what beaches in the area are safe and to always adhere to signs.
Read more: Ireland had warmest spring in 126 years, says Met Éireann
She added that lakes and rivers will also be very popular this weekend, and she warned that they tend to be colder than the see.
Cold water shock passes in about 60 to 90 seconds and she advised people hit by it to "not panic, float on your back".
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Ms Byrne warned that there are often hidden dangers in lakes and rivers, such as rocks and debris, and people should be careful when jumping in.
Meanwhile, a red forest fore warning is in place due to an "extreme fire risk".
The Department of Agriculture, Food and the Marine said called for "high vigilance" in the coming days.
Met Éireann meteorologist Linda Hughes has said that temperatures will likely be above 27C "everywhere" tomorrow.
She also said that it will be warm at night and temperatures will not fall below 17C in some places, making for some uncomfortable sleeping over the next few nights.
Ms Hughes said that while the highest temperature is likely to be 30C to 31C degrees, they "can't rule out" the possibility of breaking the July record of 33C.
There will be cooler and fresher air moving into the southwest by Sunday evening, she said, which will move across the rest of the country on Monday.
Advice issued for dealing with high temperatures
The HSE has said that people most at risk during hot weather include:
- Babies and young children
- People over 65 and those with underlying health conditions, including heart and breathing problems as well as Alzheimer's disease and dementia
- People who spend a lot of time outside or in hot places - such as those who work outdoors or the homeless - are also at high risk.
The advice for staying cool indoors is:
- Turn off lights and appliances not in use as they generate heat
- Close windows that face the sun during the day and open them at night when temperatures drop
- Close curtains in rooms that are exposed to the sun, sprinkle water over the skin, or keep a damp cloth on the back of the neck
- Use an electric fan (but only if the temperature is below 35C)
Outdoors, people should:
- Stay in the shade
- Avoid being outside, if possible, between 11am and 3pm - the hottest part of the day
- Wear light and loose-fitting clothing that covers the skin
- Wear a wide-brimmed hat and sunglasses
- Regularly apply a UVA and UVB water-resistant sunscreen to skin that is not covered, using factor 30+ for adults and 50+ for children
People are also advised to drink plenty of fluids. Water or oral rehydration sachets are considered the best option.
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