Dublin’s summer weather feels mild and steady, which makes it comfortable for exploring the city without worrying about extreme heat or cold. Daytime highs usually sit between 18°C and 20°C (64°F to 68°F), while evenings cool down to around 12°C to 13°C (54°F to 56°F).
Rain falls often, but the showers tend to be light and move through quickly, so you’ll still get plenty of time outdoors.
Long daylight hours might be one of the best parts about summer here. In June, you can get almost 17 hours of sunlight, giving you loads of time to enjoy the parks, coastline, or just wander the lively streets.
Even when the sky gets cloudy, the long days keep things bright and inviting.
What makes Dublin’s summer stand out? It’s that blend of mild warmth, breezy air, and the kind of rain that keeps everything lush and green.
If you plan for both sunshine and showers, you’ll enjoy your visit, whether you’re walking along the River Liffey or heading into the countryside.
Overview of Dublin’s Summer Climate
Dublin’s summer brings mild temperatures, lots of clouds, and steady rain. You’ll find comfortable highs, cool nights, and those long daylight hours that make it easy to get outside, even if a shower rolls through.
General Climate Classification
Dublin sits in the marine west coast climate zone (Köppen Cfb). That means mild summers, cool winters, and no real dry season.
The North Atlantic Current keeps Dublin’s temperatures steadier than you’d find inland at the same latitude.
In summer, daytime highs usually hit 18°C to 20°C (64°F–68°F). Nights drop to 11°C to 13°C (52°F–56°F).
You won’t face extreme heat, so there’s no need to worry about scorching days.
Rain sticks around all season. Even in July, which is one of the drier months, you’ll see about 8–12 rainy days.
Monthly rainfall usually falls between 50–65 mm, which is pretty moderate compared to autumn.
Clouds are a big part of the picture. More than half the time, Dublin skies are partly cloudy or overcast, so those rare full days of sun feel special.
Still, the city gets nearly 17 hours of daylight in June, which helps balance out the gray.
Seasonal Patterns and Trends
Summer in Dublin runs from June through August. Temperatures climb in June, peak in July, and ease off a bit by August.
July usually brings the warmest weather, with highs close to 20°C (68°F).
Rainfall shifts a little through the season. June averages about 59 mm, July dips to 51 mm, and August climbs to around 65 mm.
Showers come often, but they’re usually light or brief, so you can keep exploring after a quick break.
The sea starts summer at about 12°C (54°F) and warms up to nearly 15°C (59°F) by August.
Late summer feels best for coastal walks or water activities, though the water stays pretty chilly compared to southern Europe.
Sunshine hours change too. May and June have the longest days, but July and August start to shorten.
Even with less direct sun, you get plenty of daylight to spend outside.
Comparison to Other Seasons
Summer in Dublin feels much milder and brighter than winter. Winter highs only reach 8–9°C (47–48°F), and lows fall to about 4°C (39°F).
Daylight drops below 8 hours in December. Rain also gets heavier in late autumn and winter, often going past 70 mm per month.
Spring brings a gradual warm-up. May gets to about 15°C (59°F) for highs, but nights stay cool, and the sea rarely rises above 11°C (52°F).
Summer strikes the best balance for warmth, daylight, and getting outdoors.
Autumn cools off fast, dropping from 17°C (63°F) in September to around 11°C (52°F) in November.
Rain gets heavier, especially in October, which can hit nearly 76 mm. Daylight fades quickly, so outdoor plans get limited.
Summer stands out for the longest days, mildest weather, and the most reliable chances to see the coast or city sights.
Rain is always part of the deal, but it’s less of a hassle than during the colder, wetter months.
Monthly Breakdown of Summer Weather
Dublin’s summer brings mild temperatures, steady rain, and long daylight hours. Daytime highs land in the mid-to-upper 60s °F (around 18–20 °C).
Evenings stay cool, and light rain showers keep things fresh instead of hot or dry.
June Weather Highlights
June starts summer with highs near 18 °C (64 °F) and lows around 11–12 °C (52–54 °F).
You get almost 17 hours of daylight, so there’s plenty of time for outdoor fun.
Rainfall averages about 55–60 mm, so it’s smart to pack a light rain jacket. Showers don’t last long, and sunshine usually comes back fast.
The sea stays around 12 °C (54 °F), which is cold for swimming but fine for walking along the coast.
The UV index goes up to moderate, so sunscreen helps on clear days.
Gardens and parks look their greenest in June, thanks to the mix of rain and sun.
July Weather Highlights
July is usually the warmest month in Dublin. Highs reach about 20 °C (68 °F), and lows hover around 13 °C (55 °F).
The air feels comfortable, and you almost never get heat extremes.
Rain falls a bit less, averaging 50–55 mm, but you’ll still see about 9–10 days with some rain.
Humidity stays moderate, and breezes from the Irish Sea keep things fresh.
The sea warms to about 14 °C (57 °F), so coastal outings feel nicer, though it’s still cold for a swim.
Sunshine averages 5–6 hours per day, and evenings stay light until late, making it easy to keep sightseeing.
July is a favorite for outdoor events and festivals.
August Weather Highlights
August keeps the mild summer feel, but temperatures start to drop a bit.
Highs average 19–20 °C (66–68 °F), and lows dip to 13 °C (55 °F).
Evenings can feel noticeably cooler, especially by the water.
Rain picks up again, reaching about 60–65 mm, and showers come more often than in July.
You’ll see more overcast skies, but sunshine still breaks through.
Sea temperatures peak at around 15 °C (59 °F), the warmest they get all year.
If you want to try water sports or coastal trips, August is your best bet.
Long daylight hours stick around, but nights arrive a bit earlier as summer winds down.
Early September Weather
By early September, Dublin starts easing into autumn.
Highs drop to about 17 °C (63 °F), and lows settle near 11 °C (52 °F).
The change is slow, so the first half of the month often feels like late summer.
Rainfall averages 55–60 mm, spread over 10–11 days.
Humidity bumps up a bit, and breezes get stronger.
Sea temperatures hang on at 14–15 °C (57–59 °F), holding some summer warmth for a little while.
Daylight shortens to about 13 hours, but you still have time each day to explore.
Early September works well if you like cooler air and smaller crowds.
Typical Summer Temperatures in Dublin
Dublin’s summer brings mild weather, steady highs, and cool nights.
Temperatures don’t swing wildly, so it’s a great season for walking, sightseeing, or just being outside.
Average Highs and Lows
At Dublin Airport, which keeps the city’s official climate stats, average highs in June reach about 18 °C (64 °F).
July and August are a bit warmer, averaging 19–20 °C (66–68 °F).
Nights cool off a lot more. In June, the average low is near 10 °C (50 °F), while July and August stay around 11–12 °C (52–54 °F).
This small gap between highs and lows keeps things stable.
You won’t see the big heat spikes that hit continental Europe, but you’ll want layers since evenings can get chilly.
Daytime Versus Nighttime Temperatures
During the day, temperatures hang out in the high teens Celsius, which feels good for outdoor plans without any heavy heat.
Even when it’s sunny, humidity and sea breezes keep the air from getting hot.
At night, things cool down more.
Lows near 10–12 °C mean you might need a light jacket if you’re out late.
Dublin’s spot by the coast helps keep temperature swings in check, so nights are cool but not harsh.
Day length matters too. In midsummer, you get over 16 hours of daylight.
This extra light keeps the air from dropping too fast in the evening, but you’ll still notice the difference between day and night.
Record Temperatures
Summers stay mild, but Dublin sometimes gets odd bursts of heat.
The highest summer temperatures at Dublin Airport have reached the high 20s °C (around 82–86 °F), though that’s rare.
On the flip side, summer nights have dipped to around 5–7 °C (41–45 °F) in some years.
Cooler nights happen more often than heat waves, especially in June.
These records show that Dublin’s weather can shift.
You probably won’t see extremes, but brief warm spells or chilly nights do pop up.
Packing light layers and clothes you can mix and match will keep you comfy whatever the weather does.
Rainfall and Humidity During Summer
Dublin’s summer brings moderate rainfall, lots of light showers, and steady humidity.
You’ll get a mix of wet and dry days, but outdoor plans usually work if you’re ready to adapt.
Average Monthly Precipitation
Rain in Dublin during summer is moderate compared to winter.
At Dublin Airport, average rainfall sits between 60 mm and 80 mm per month from June to August.
August usually sees the most rain, landing near the top of that range.
June is a bit drier, but showers still show up.
Unlike places with sharp wet and dry seasons, Dublin’s rain stays pretty steady.
You should expect both sunny spells and light rain, not long dry stretches.
Summer rain keeps everything green but doesn’t usually mess up most travel plans.
A light rain jacket works better than heavy waterproofs.
Frequency of Rainy Days
Instead of heavy downpours, Dublin’s summer rain falls as short showers.
On average, you’ll see 11 to 15 days per month with some measurable rain in June, July, and August.
That’s about half the days each month, but it doesn’t mean it rains all day.
A morning shower might clear up by afternoon, or you’ll get light drizzle on and off.
The city’s weather reflects its oceanic climate, with clouds and Atlantic systems shaping daily conditions.
You might not dodge rain completely, but you can usually work around the shifting skies.
Carrying a small umbrella or waterproof jacket makes life easier.
Locals don’t let rain slow them down, and most outdoor attractions stay open and enjoyable.
Humidity Levels
Humidity in Dublin stays pretty high in summer, but it rarely feels heavy because the temperatures are mild.
Average relative humidity runs between 70% and 80% from June through August.
July often feels the driest, with numbers at the lower end.
August can feel a bit more humid, especially on rainy days.
Since daytime highs only reach about 18–20°C (64–68°F), the air doesn’t get sticky like in hotter places with the same humidity.
You might notice a bit of dampness, especially in the mornings or evenings.
If humidity bothers you, look for indoor spaces with good airflow.
For most travelers, though, the humidity feels pretty manageable and fits Dublin’s maritime vibe.
Sunshine Hours and Daylight Length
Dublin’s summer gives you long days with lots of daylight and moderate sunshine.
You’ll see way more brightness than in winter, though cloud cover often keeps direct sun in check.
Average Daily Sunshine
During summer, Dublin usually gets 5 to 6.5 hours of sunshine per day. May and June bring the brightest days, sometimes even sunnier than July or August.
The southeast of Ireland claims the highest sunshine totals, but Dublin still enjoys a fair amount of bright hours. In winter, some days barely get an hour of sun, so summer feels much lighter by comparison.
Most days, sunshine comes in bursts, split between clear skies and cloudy spells. You’ll probably see several short sunny periods, not long stretches.
If you’re planning to be outside, the brightest hours often fall in late morning or early afternoon.
| Month | Avg. Sunshine Hours per Day |
|---|---|
| May | 6+ |
| June | 6–6.5 |
| July | 5–6 |
| August | 5–5.5 |
Length of Daylight
Daylight in Dublin really changes throughout the year because of its northern spot on the map. The jump from winter to summer is pretty dramatic.
Around the summer solstice in late June, you can expect about 17 hours of daylight. Even early August holds onto well over 15 hours.
In December, days shrink to just over 7 hours. That’s quite a difference.
Long summer evenings mean you get light until late, with twilight stretching your time outdoors. It’s one of those things visitors notice—how late the sun sets compared to southern Europe.
In June, sunrise can happen before 5:00 a.m., and sunset might not come until nearly 10:00 p.m. You can really pack a lot into your day.
Cloud Cover Trends
Even with summer, Dublin skies stay pretty cloudy. Records show that over half the sky stays covered by cloud for much of the year.
April usually stands out as the clearest month, but summer still brings its share of clouds.
Cloud cover tends to peak from late morning into early afternoon. Sometimes, nights and late evenings clear up, giving you a better sunset view.
Coastal spots like Dublin often get a bit more sunshine than inland areas, since clouds form more easily over land.
On dull days, almost all sunlight filters through clouds, making it feel diffused. On clear days, the cloud cover drops, and you get longer bright spells.
Dublin weather really loves to keep you guessing, so expect both sunny breaks and overcast skies during your visit.
Wind Conditions and Other Weather Factors
Summer in Dublin brings moderate breezes from the Atlantic, mild humidity, and plenty of cloud cover. Most days, you’ll notice the wind, but temperatures stay comfortable and rain usually falls light and brief.
These factors all shape how you plan your time outside and what you pack.
Typical Wind Speeds
From June through September, Dublin’s average wind speeds hover around 4 meters per second (about 14 km/h or 9 mph). That’s enough for a steady breeze—branches sway, water ripples, and you’ll probably feel it on your face.
It’s calmer than winter, but the breeze is still a big part of Dublin’s summer vibe.
Stronger gusts pop up now and then, but not as often as in the colder months.
At Dublin Airport, data shows wind rarely drops to nothing, so count on at least a light breeze. If you’re walking or cycling, you’ll notice the wind, but it usually doesn’t ruin any plans.
Prevailing Wind Directions
In Dublin, winds mostly blow from the west and southwest, bringing in moist Atlantic air. That’s why the city gets so many cloudy skies and scattered showers, even in summer.
When the wind shifts north, the air cools a bit—though that doesn’t happen much in the warmest months.
Easterly winds show up rarely and feel weaker, but they sometimes bring drier spells.
Because of the usual westerly winds, you can expect a mix of sun and passing showers most days. Outdoor events usually go ahead, but bringing a light rain jacket makes sense.
Other Atmospheric Conditions
Humidity in Dublin’s summer stays moderate, often between 70–80%. The air sometimes feels a little damp, but it’s not uncomfortable.
Clouds stick around a lot, so skies often look partly cloudy or overcast.
Rain falls steadily but not heavily. Showers happen often, but they’re usually quick and light.
You might see the weather change a few times in just one day.
Sunshine hours average 5–6 per day, but the long daylight means you still get plenty of time outside.
Visibility is generally good, and fog doesn’t show up much in summer.
Practical Tips for Experiencing Dublin’s Summer Weather
Dublin’s summer weather stays mild, with highs around 15–20°C (59–68°F) and frequent light rain. Long daylight hours give you more time to explore, but sudden showers and cool breezes mean you should stay ready for anything.
What to Pack
Bring layers. A light sweater or fleece works well under a waterproof jacket.
Even in July, evenings can feel chilly, especially by the coast.
Rain happens a lot, so a compact umbrella or waterproof jacket with a hood is more useful than a heavy coat.
Wear comfortable, water-resistant shoes—city streets can stay damp after showers.
For sunny days, pack sunglasses and sunscreen. UV levels aren’t as high as in southern Europe, but those long days still add up. A small daypack is handy for carrying layers or snacks.
| Item | Reason |
|---|---|
| Waterproof jacket | Frequent showers |
| Comfortable shoes | Walking on wet streets |
| Layers | Variable temperatures |
| Sunglasses & sunscreen | Long daylight hours |
Weather-Related Travel Advice
Expect changeable weather. Mornings might start out bright, then rain could roll in by afternoon, and you might see clear skies again by evening.
Keep your schedule flexible so you can switch plans without too much stress.
Public transport works well, even in wet weather. A Leap Card helps make buses, trams, and trains more affordable if you want to dodge a downpour.
Stay central if you can. Dublin is a walkable city, but staying near the center means you won’t have far to go if the weather turns.
Check local forecasts each day. Met Éireann, the Irish Meteorological Service, gives solid short-term updates, so you can decide whether to grab an umbrella or just an extra layer before heading out.
Outdoor Activities and Weather Considerations
Mild summer temperatures make walking tours, cycling, and coastal hikes pretty comfortable. Still, rain can leave trails slippery, so if you want to check out Howth or Ticknock, grab some sturdy shoes.
People love swimming at the Forty Foot, but honestly, the water feels chilly even in the middle of summer. You’ll want warm clothes ready for after your swim.
If you’re looking for city activities, parks like Phoenix Park or St. Stephen’s Green work great for picnics when the weather behaves. Showers can pop up, but you can duck into a nearby café or museum without missing a beat.
Evenings in Dublin often stay outdoors, rain or not. It’s just easier to bring a jacket and not gamble on a clear sky.