As September begins, autumn seems to be settling in across Ireland. Today, Tuesday, September 1st, 2026, looks like an unsettled start to the month, with rain becoming widespread. If you were hoping for a lingering taste of summer, the Ireland weather forecast suggests you'll be disappointed. Grab your umbrellas and raincoats; it looks like a wet day.

This Morning's Mixed Bag

The day is starting with a bit of a mixed bag. Many areas are seeing mainly dry conditions, with scattered showers and some brief sunny spells. It's the kind of morning that makes you think you might get away with leaving the waterproofs at home. Don't fall for it. The Ireland weather forecast is clear: this calm won't last.

As the morning progresses into the afternoon, things are set to change. Cloud cover will increase significantly, bringing more persistent rain. Ulster, in particular, should brace itself, as the rain there could turn heavy, especially near northern coasts. I always find it interesting how quickly the weather can shift here. One minute you're enjoying a bit of sunshine, the next you're dodging puddles.

To cap off the day, another spell of rain is making its way towards the southwest this evening. So, no matter where you are on the island, precipitation seems firmly on the agenda. Temperatures today will generally range from 15 to 20 degrees Celsius, which is still quite mild for early September. Winds will be mostly moderate from the southwest.

A Wet Night Ahead

Tonight, the rain is really going to settle in. It's expected to become widespread across the entire country, with heavy downpours at times. If you have any plans that involve being outdoors, you might want to rethink them or at least ensure you're well-covered. The good news (if you can call it that) is that the rain should ease and become patchier in the southwest towards morning.

Overnight temperatures won't drop too low, staying between 12 and 16 degrees Celsius. We'll have light to moderate south to southeast winds, which will pick up a bit and become fresher along southern coasts. So, a mild but definitely wet night is on the cards.

Looking Ahead: The Rest of the Week

This unsettled pattern isn't just a one-day wonder; it's looking like a theme for the week, according to the Ireland weather forecast.

Wednesday, September 2nd

Wednesday will start off much like tonight ends: wet for most of us, with outbreaks of rain and drizzle. However, there's a glimmer of hope as the morning progresses. The rain should become patchier, and we might even see some occasional bright breaks, mainly in the south and east. Don't get too excited though, as more persistent showery rain is expected to continue in parts of the northwest and north.

Temperatures on Wednesday will be a touch warmer, ranging from 16 to 21 degrees Celsius, with moderate southwest winds. So, a bit milder, but still needing that umbrella.

Wednesday Night

Wednesday night brings well-scattered showers and clear spells. It'll be a mild night, with lowest temperatures of 13 to 16 degrees, accompanied by moderate southwesterly breezes.

Thursday, September 3rd

Thursday looks to start mainly dry with some sunny spells and only scattered showers. This could be our best chance for a drier spell this week. But, as seems to be the trend, outbreaks of rain will move in from the west through the afternoon, likely extending to most areas by the evening. Temperatures will again be in the 16 to 21 degrees range, with moderate to fresh west to southwest winds, potentially strong near coasts.

Thursday night will see widespread outbreaks of rain continuing, heavy at times. The rain will likely become mostly confined to the south and southeast towards morning. Lowest temperatures will be between 12 and 16 degrees, with moderate southwesterly winds, fresher along southern coasts.

Friday, September 4th

Friday offers a slightly drier prospect for most, with sunny spells and scattered showers. These showers will mainly affect the north and northwest. Highest temperatures will be a bit cooler, from 15 to 19 degrees, with moderate to fresh westerly winds.

The Weekend Outlook

Looking further ahead to the weekend, the Ireland weather forecast suggests continued uncertainty, but the general theme remains unsettled. Saturday is likely to see further outbreaks of rain, with temperatures between 15 and 19 degrees and mostly light southerly breezes.

The outlook for Sunday and Monday indicates that this unsettled weather, dominated by low pressure, is here to stay, bringing more rain and showers. It's a real shame to see September kick off this way, but that's Irish weather for you, isn't it? Always keeping us on our toes.

For the most up-to-date information, it's always a good idea to check the official Met Éireann website. They provide comprehensive forecasts that are constantly updated, giving you the clearest picture of what to expect.

So, as we navigate this rather damp start to September, remember to dress for the conditions. Layers are your friend, and a reliable waterproof outer layer is essential. Don't let the rain dampen your spirits though; there's still plenty to enjoy across Ireland, even if it means doing it indoors or wrapped up warm. Here's hoping for some brighter spells soon!