As Sunday, October 4th, 2026, rolls in, Ireland is set for a day that feels more like a gentle nod to summer than a full dive into autumn. If you were hoping for crisp, bright conditions to kick off your Sunday, you might be a little disappointed, but on the upside, it's going to be remarkably mild.

Today, cloud cover will dominate across the country. Expect mostly grey skies, with some patches of light rain and drizzle, particularly noticeable over western and northern counties. For those living or planning to travel near hills and coasts, mist and fog could be a factor, reducing visibility. However, it's not all doom and gloom. If you're further east or southeast, you stand a better chance of seeing some bright or even sunny spells as the morning mist eventually clears.

What really stands out for this Ireland Sunday weather is the temperature. We're looking at a distinctly mild and humid day, with highs reaching a very pleasant 15 to 19 or even 20 degrees Celsius. For early October, that's quite a treat, making it feel less like we're heading into the colder months and more like an extension of the warmer ones. Winds will generally be from the southwest, moderate to fresh in the west and north, but lighter elsewhere.

I think it's fair to say that this kind of mild, cloudy Ireland Sunday weather often leads to a bit of a quandary. Do you embrace the warmth and head out, perhaps for a walk along the coast, even with the chance of drizzle? Or do you use the grey skies as an excuse for a cozy day in? My advice? Lean into the mildness. It won't last forever, and a gentle stroll, even under a soft sky, can be incredibly refreshing. Just remember a light jacket if you're out west or up north.

Tonight's Outlook

As Sunday transitions into Sunday night, the mild and overcast conditions are set to continue. We're not expecting any significant change, with patchy drizzle, mist, and hill fog persisting in many areas. It's going to be another exceptionally mild night, with temperatures not dropping much below 13 to 15 degrees. South to southwest winds will remain moderate, potentially becoming fresh or strong along western and northwestern coastal areas. So, if you're out and about this evening, you won't need to bundle up too much.

Looking Ahead to Monday

Our Ireland Sunday weather forecast naturally leads us into what to expect for Monday, October 5th. The week will start much like the weekend ends: mostly cloudy and locally misty. There will be patchy rain and drizzle, primarily affecting the north and northwest. Further south, the amounts of rain will be generally small, and you might even catch some sunny spells, especially in the south and southeast.

Temperatures for Monday will mirror Sunday's mildness, ranging from 15 to 19 or 20 degrees Celsius. A mostly moderate west to southwest breeze will be in play, easing later in the day. So, if you're planning your week, Monday looks set to continue this unseasonably warm spell for the start of October.

The Week Ahead: A Mixed Bag

While this Ireland Sunday weather is certainly on the milder side, the national outlook for the week ahead suggests a bit more variety. We're looking at a mixed bag, with some cooler days eventually making an appearance.

Monday night is expected to bring more widespread outbreaks of rain for many parts of the country, with overnight lows dipping to between 9 and 14 degrees.

Tuesday looks set to be damp or wet initially, as that overnight rain continues its southward journey. However, a clearance is expected to extend from the northwest, bringing sunshine and mostly dry conditions for the afternoon and evening. There might be some lingering rain near the south coast, and a shower or two could affect the northwest. Temperatures on Tuesday will be between 13 and 18 degrees, accompanied by a moderate northwesterly breeze.

Wednesday will bring a noticeable dip in temperatures, making it a cooler day overall. Expect a mix of cloud and sunny spells, with scattered passing showers. These showers will mainly affect the northern half of the country, but a few could pop up further south. Highs will be between 11 and 15 degrees in a moderate, occasionally fresh, northwest breeze. Wednesday night should become mostly dry with clear spells and an easing breeze, making it rather cold with lows of 4 to 9 degrees.

Thursday is forecast to start dry and sunny, which sounds lovely, but don't get too comfortable. Rain and freshening winds are likely to spread in from the Atlantic later in the day, with highs of 12 to 15 degrees.

After what sounds like a wet and blustery Thursday night, Friday looks to be brighter and a little milder. We can expect sunny spells and some scattered showers to round off the working week.

So, while this Ireland Sunday weather feels exceptionally mild for the season, it's a good reminder that autumn is still very much in play, and conditions can change quite quickly. Always keep an eye on the latest updates from trusted sources like Met Éireann for the most accurate and up-to-date information for your area. The mild start to October is a pleasant surprise, but don't pack away those warmer layers just yet!