Dublin Stargazing & Astronomy Report
Light pollution and stargazing locations near Dublin
- City
- Dublin
- Country
- Ireland
- Latitude
- 53.3498
- Longitude
- -6.2603
Key Sky Quality Metrics
- SQM (mag/arcsec²)
- 17.41
- Bortle class
- Class 9 (Class 9)
- Darkness Quotient
- 18%
- Dataset
- March 2026
Inner city sky
Stargazing in Dublin
Dublin is Ireland’s capital and largest city, a lively coastal metropolis on the east coast with a strong maritime setting and a busy urban character.
The city generally experiences Extreme Light Pollution, with a Darkness Quotient of just 18% — placing it among the more light-polluted urban skies in Europe.
For practical observing from within Dublin, the most reliable targets are the Moon, planets, double stars and the brightest open clusters. Fainter deep-sky objects are heavily washed out by the city glow, though a few showpiece targets can still be attempted with patience.
Meaningfully darker skies do exist outside the city, but you need to leave the urban area properly behind to find them. The nearest reasonable step up is about 50 kilometres away to the west, near County Louth, The Borough District of Drogheda, while the best nearby dark-sky option is roughly 85 kilometres to the south-south-west near County Carlow, The Municipal District of Tullow.
The map shows Dublin as a compact but very bright urban core, with intense pink-white colouring at the centre fading through red, orange and yellow into a broad halo around the city. That pattern is typical of a major capital whose skyglow spills well beyond the built-up area.
Away from the centre, the colours cool quite quickly in several directions, especially across the sea-facing side and into some inland areas where blue and grey tones appear. Even so, the city’s glow remains obvious against its surroundings, and smaller settlements show up as scattered yellow and orange islands rather than anything comparable to Dublin’s brightness.
The darkest regions on the map lie farther from the metropolitan core, where the background turns dark grey to near-black. In visual terms, Dublin stands out strongly from its surroundings: not just brighter than nearby towns, but dominant enough to shape much of the local night sky for quite a distance.
Overhead sky impression
Looking straight up from Dublin, the sky is strongly affected by urban light, with a bright background that suppresses all but the more obvious stars. Familiar patterns such as Orion, the Plough and the Summer Triangle can still be picked out, but they look thinner and less rich than they would under darker skies.
With a zenith reading of 17.41 SQM, the overhead sky is firmly in the inner-city range. The Milky Way is effectively lost, and much of the pleasure of naked-eye stargazing comes from following the brighter constellations, planets and the Moon rather than sweeping rich star fields.
For telescope users, the zenith is still the best part of the sky simply because you are looking through less atmosphere. Even so, the limiting brightness of the sky means contrast remains the main obstacle rather than altitude.
north - marginal
About 15 kilometres north of Dublin, the sky is marginal for quick-look observing, at around Bortle 6. It does improve steadily in this direction, with genuinely dark conditions only turning up much farther out at around 200 kilometres.
north-north-east - marginal
About 15 kilometres north-north-east of the city, conditions are marginal, around Bortle 6. A much darker sky is reachable in this direction at roughly 50 kilometres, making it one of the quicker routes to a real improvement.
north-east - marginal
About 15 kilometres north-east of Dublin, the sky is still marginal at around Bortle 6, though already noticeably better than the city centre. Substantially darker conditions arrive by about 50 kilometres in this direction.
east-north-east - fair
Around 15 kilometres east-north-east of the city, the sky reaches fair quality at about Bortle 5. A more serious dark-sky improvement is available by roughly 50 kilometres in this direction.
east - fair
About 15 kilometres east of Dublin, conditions are fair, around Bortle 5, so brighter deep-sky objects begin to become more realistic. Genuinely dark skies can be reached at roughly 50 kilometres in this direction.
east-south-east - fair
Around 15 kilometres east-south-east of the city, the sky is fair at about Bortle 5. A substantial step into darker conditions arrives by roughly 50 kilometres.
south-east - marginal
About 15 kilometres south-east of Dublin, the sky remains marginal at around Bortle 6. The picture improves a good deal farther out, with dark conditions appearing by about 50 kilometres.
south-south-east - marginal
Around 15 kilometres south-south-east of the city, the sky is marginal, close to Bortle 6. A much darker sky is available by roughly 50 kilometres in this direction.
south - fair
About 15 kilometres south of Dublin, conditions are fair at around Bortle 5. Darker skies are reachable by about 50 kilometres, so this is a promising direction for leaving the city glow behind.
south-south-west - marginal
Around 15 kilometres south-south-west of the city, the sky is marginal at about Bortle 6. It becomes much darker by roughly 50 kilometres, which fits well with the stronger dark-sky options farther out in this sector.
south-west - marginal
About 15 kilometres south-west of Dublin, the sky is still marginal, around Bortle 6. A notably darker sky appears by about 50 kilometres, although the improvement is not quite as strong as in some other directions.
west-south-west - poor
Around 15 kilometres west-south-west of the city, conditions are still poor at about Bortle 8, with strong urban skyglow lingering. Better skies do arrive farther out, but genuinely dark conditions take around 100 kilometres in this direction.
west - poor
About 15 kilometres west of Dublin, the sky remains poor at around Bortle 7, so the city’s glow is still a major factor. It improves to good conditions by around 50 kilometres and reaches genuinely dark sky at roughly 100 kilometres.
west-north-west - poor
Around 15 kilometres west-north-west of the city, the sky is poor at about Bortle 7. A worthwhile improvement comes farther out, with dark conditions appearing by roughly 50 kilometres.
north-west - marginal
About 15 kilometres north-west of Dublin, conditions are marginal at around Bortle 6. This direction does improve, but the darkest skies in the sampled range are a long way off, at around 200 kilometres.
north-north-west - marginal
Around 15 kilometres north-north-west of the city, the sky is marginal, about Bortle 6. A much darker sky becomes available by roughly 100 kilometres, with good conditions reached sooner than that.
zenith - poor
Looking straight up from Dublin, the zenith is poor, with the city sitting at Bortle 9 and 17.41 SQM. The background sky is bright, so only the more prominent stars and constellation outlines stand out clearly, while the Milky Way is lost from view.
-
Near County Carlow, The Municipal District of Tullow
- Direction
- SSW
- Distance (km)
- 83.7
- SQM
- 21.44
- Bortle
- 3
Milky Way visible, broadband DSO imaging
-
Near Antrim and Newtownabbey District, Northern Ireland
- Direction
- ESE
- Distance (km)
- 137.7
- SQM
- 21.16
- Bortle
- 4
Bright nebulae, galaxies, narrowband imaging
-
Near County Louth, The Borough District of Drogheda
- Direction
- W
- Distance (km)
- 48.8
- SQM
- 21.01
- Bortle
- 4
Bright nebulae, galaxies, narrowband imaging
Genuinely dark skies are not right on Dublin’s doorstep, but a worthwhile improvement is available with a moderate drive out of the city.
The nearest Bortle 4 site is about 50 kilometres to the west at Near County Louth, The Borough District of Drogheda, while the best nearby conditions are around 85 kilometres to the south-south-west at Near County Carlow, The Municipal District of Tullow, where the sky reaches Bortle 3.
In several easterly and southerly directions the sky also improves quite quickly once you are well clear of the city, so Dublin is better placed than some large capitals for a planned stargazing trip.
-
Within 50 km
- Place
- Near County Louth, The Borough District of Drogheda
- Direction
- W
- Distance (km)
- 48.8
- SQM
- 21.01
- Bortle
- 4
-
Within 100 km
- Place
- Near County Carlow, The Municipal District of Tullow
- Direction
- SSW
- Distance (km)
- 83.7
- SQM
- 21.44
- Bortle
- 3
-
Within 200 km
- Place
- Near Antrim and Newtownabbey District, Northern Ireland
- Direction
- ESE
- Distance (km)
- 137.7
- SQM
- 21.16
- Bortle
- 4
Long-term trend
Dublin’s measured sky brightness has been broadly stable over the long term, with only a very slight improvement in the data. The earliest reading is 17.37 SQM and the latest is 17.41 SQM, which is a small change in practical observing terms.
Across the full record, values range from 17.23 to 17.74 SQM, with a mean of 17.5 SQM. The overall trend slope is only 0.003 SQM per year, so while conditions fluctuate a little from one dataset to another, the city remains firmly in the brightly lit urban category.
In plain English, Dublin’s sky has not changed dramatically over the period sampled. For observers, that means the same broad rule still applies: bright Solar System targets do well, but faint deep-sky observing needs a trip away from the city lights.
From within Dublin itself, the best targets are the bright, contrast-rich ones: the Moon, planets and double stars especially. These cope far better with a bright urban sky than faint fuzzies do.
A handful of showpiece deep-sky objects can still be attempted with care, particularly bright nebulae such as M42 and the brightest globular clusters. They are usually better in a telescope than with the naked eye, and expectations need to stay realistic.
For the Milky Way, faint galaxies, broad nebulae and the full spectacle of meteor showers, a darker site outside the city makes a dramatic difference. Dublin is very much a place where target choice matters.
- Moon
- planets
- double stars
- brightest open clusters
- bright nebulae such as M42
- the brightest globular clusters
- Milky Way
- faint galaxies
- broadband nebulae
- meteor showers
Can you see stars from Dublin?
Yes — you can still see stars from Dublin, but far fewer than from the countryside. The brighter constellations and standout stars remain visible, while the fainter background stars are lost in the city glow.
Can you see the Milky Way from Dublin?
In normal conditions from within the city, no. With Dublin at Bortle 9 and 17.41 SQM, the Milky Way is effectively washed out.
What Bortle class is Dublin?
Dublin is Bortle 9, which is an inner-city sky. That means severe light pollution and a strong loss of faint stars and deep-sky contrast.
What is the SQM reading for Dublin?
The measured sky brightness is 17.41 SQM. That is a bright urban reading, consistent with strong light pollution.
Where are the nearest dark skies to Dublin?
The nearest reasonable darker site in the supplied locations is Near County Louth, The Borough District of Drogheda at 48.8 kilometres, where conditions reach Bortle 4. The best nearby option listed is Near County Carlow, The Municipal District of Tullow at 83.7 kilometres, reaching Bortle 3.
Is Dublin good for astrophotography?
It can be good for lunar, planetary and some narrow-field work on bright targets, but it is not well suited to faint wide-field deep-sky imaging from the city itself. For richer Milky Way or faint nebula photography, you would want to travel to a darker site.
How far do you need to drive from Dublin for better stargazing?
A clear improvement is available at about 50 kilometres, where skies can reach Bortle 4. For a stronger dark-sky experience, the best listed nearby site is about 85 kilometres away near County Carlow, The Municipal District of Tullow.