Cardiff Stargazing & Astronomy Report

Key Sky Quality Metrics

SQM (mag/arcsec²)

18.48

Bortle class

Class 8 (Class 8)

Darkness Quotient

27%

Dataset

July 2026

City sky

Cardiff: The Practical Verdict

Cardiff, located in the United Kingdom, is a mid-sized city with notable light pollution making it challenging for stargazing. The night sky here is classified as having high light pollution, meaning that views for those keen on observing the stars are significantly compromised. The primary limiting factor is the city's sky brightness which completely obscures the Milky Way.

From Cardiff, celestial observing opportunities are largely confined to the brightest objects. The Moon, planets, and bright stars are visible, and narrowband imaging can be effective with care. Attempting visual deep-sky observations or widefield Milky Way views is not practical due to the city's bright sky background.

For those seeking a darker sky, Lincombe offers a substantial improvement. Located roughly 75 km to the west-south-west, it provides a much clearer view of the night sky and is a worthwhile destination for those interested in deep-sky targets.

At a Glance

Overall

Poor city sky - This is a poor city sky. The Milky Way is not visible and most deep-sky observing is unrealistic from the location itself.

Milky Way

Not visible - The Milky Way is erased by the bright urban sky background.

Best targets from here

Moon, planets, bright stars, double stars, solar system events, narrowband imaging only with care

Do not prioritise

visual deep-sky observing, broadband galaxies, reflection nebulae, widefield Milky Way

Best nearby upgrade

Lincombe sits about 73 km west south west and reaches Bortle 3, roughly 17x darker.

Moderate dark window

Cardiff's longest dark windows fall in December and January, with the shortest nights around June and July. Plan deep-sky sessions around the autumn and winter months for the best combination of long nights and true astronomical darkness.

Frequently Asked Questions

Can you see the Milky Way from Cardiff?

No. Cardiff is a Bortle Class 8 sky with SQM 18.48, so the Milky Way is not visible from the city. For Milky Way photography, look for a Bortle 4 or darker site.

What Bortle class is Cardiff?

Cardiff is Bortle Class 8 (SQM 18.48), a poor city sky for astronomy.

Is Cardiff good for stargazing?

Not for serious deep-sky observing. Cardiff is a poor city sky where the Moon, planets, and a handful of bright targets are the realistic options from the city itself.

Is Cardiff good for astrophotography?

Broadband deep-sky imaging is heavily compromised from Cardiff and a Bortle 4 or darker site is strongly recommended. Even narrowband imaging is difficult from Cardiff without careful processing.

What can you observe from Cardiff?

Primary targets from Cardiff include Moon, planets, bright stars, double stars, solar system events. Targets such as visual deep-sky observing, broadband galaxies, reflection nebulae are not realistic from this sky.

Where are darker skies near Cardiff?

The closest meaningfully darker mapped site is The Herberts, about 17 km west south west of Cardiff, reaching Bortle 6.

When is the sky darkest in Cardiff?

The sky over Cardiff is darkest around January, December. Significant summer limitation: around 59 nights per year have no true astronomical darkness.

Is light pollution in Cardiff getting better or worse?

There is not yet enough long-term data to give a confident trend for Cardiff.

• The Herberts

  Direction

  WSW

  Distance (km)

  16.6

  SQM

  20.26

  Bortle

  6

• Lincombe

  Direction

  WSW

  Distance (km)

  72.5

  SQM

  21.58

  Bortle

  3

• Abbey

  Direction

  S

  Distance (km)

  66.4

  SQM

  21.07

  Bortle

  4

• Higher Clatcombe

  Direction

  SE

  Distance (km)

  73.1

  SQM

  20.98

  Bortle

  4

• Inwardleigh

  Direction

  SW

  Distance (km)

  99.8

  SQM

  21.53

  Bortle

  3

• Abergwili

  Direction

  WNW

  Distance (km)

  84.3

  SQM

  20.90

  Bortle

  4