Mandurah Stargazing & Astronomy Report
Light pollution and stargazing locations near Mandurah
- City
- Mandurah
- Country
- Australia
- Latitude
- -32.5258
- Longitude
- 115.7220
Key Sky Quality Metrics
- SQM (mag/arcsec²)
- 19.33
- Bortle class
- Class 7 (Class 7)
- Darkness Quotient
- 37%
- Dataset
- March 2026
Suburban/urban transition
Stargazing in Mandurah
Mandurah is a coastal city in south-western Western Australia, known for its waterways, estuary setting and close connection to the Perth urban corridor.
The city generally experiences High Light Pollution, with a Darkness Quotient of 37% — making it brighter than many regional centres, though not as intensely lit as the largest inner metropolitan areas.
For practical observing from within the city, the most reliable targets are the Moon, planets, double stars and the brightest open clusters. A few showpiece deep-sky objects can be attempted with care, but faint nebulae and galaxies are usually washed out by the city glow.
Mandurah does have meaningfully darker skies within reach, especially to the south and south-west. A reasonable improvement appears after roughly 25 kilometres in those directions, while truly dark country skies are farther out — with the nearest standout site about 185 kilometres to the south-south-east near Shire of Kojonup, Western Australia.
The map shows Mandurah as a concentrated bright core of pink, red and orange, surrounded by a broad halo of yellow, green and blue. That pattern is typical of a strongly lit urban area whose skyglow spreads well beyond the built-up centre.
The darkest region on the crop lies to the west, where the map falls away quickly into black, indicating much less nearby artificial light in that direction. By contrast, the east side is peppered with many smaller light pools, suggesting a more scattered but persistent chain of settlements and illuminated areas rather than one clean transition to darkness.
South and south-west of the city, the brightness breaks into smaller patches and the background darkens more effectively, which fits the idea that better observing conditions can be found with a relatively modest drive. Overall, Mandurah stands out clearly as one of the brighter points in its immediate surroundings, but it is not trapped inside an unbroken wall of urban glow on every side.
What the sky overhead is like
Looking straight up from Mandurah, the sky is bright enough that familiar constellations still show well, but the background never becomes properly inky black. The brighter stars stand out clearly, while the dimmer pattern stars that give constellations their fuller shape are more easily lost.
This means the sky can still feel active and rewarding for casual observing, especially when the Moon or planets are up. However, the overall light dome limits contrast, so subtle star clouds and faint deep-sky detail are much harder to pick out from within the city.
In practical terms, the zenith is noticeably better than the brightest horizons, but it still reflects an urban-edge sky rather than a truly dark one.
north - fair
About 15 kilometres north of Mandurah, the sky is fair, with conditions around Bortle 5. Genuinely dark skies are possible farther out in this direction, but they do not arrive until roughly 200 kilometres from the city.
north-north-east - marginal
About 15 kilometres north-north-east of the city, the sky is marginal at around Bortle 6, so local glow is still quite intrusive. Darker conditions do improve farther out, with genuinely dark skies turning up at roughly 200 kilometres.
north-east - fair
About 15 kilometres to the north-east, the sky is fair at around Bortle 5, good enough for brighter targets but still affected by urban light. Much darker rural conditions become reachable farther out, at roughly 100 kilometres in this direction.
east-north-east - fair
About 15 kilometres east-north-east of Mandurah, the sky is fair, sitting around Bortle 5. This direction improves quite well, with genuinely dark skies appearing at roughly 100 kilometres.
east - good
About 15 kilometres east of the city, the sky is already good by urban standards, at around Bortle 4. It is one of the more promising directions for a quick escape, and genuinely dark skies are reached at roughly 50 kilometres.
east-south-east - fair
About 15 kilometres east-south-east of Mandurah, the sky is fair at around Bortle 5. Conditions improve strongly farther out, with genuinely dark skies arriving at roughly 50 kilometres.
south-east - fair
About 15 kilometres south-east of the city, the sky is fair, again around Bortle 5. A much better step up comes farther out, with dark rural conditions reached at roughly 50 kilometres.
south-south-east - good
About 15 kilometres south-south-east of Mandurah, the sky is good at around Bortle 4. This is one of the quickest directions for a real improvement, with genuinely dark skies appearing at roughly 25 kilometres.
south - good
About 15 kilometres south of the city, the sky is good, around Bortle 4, and already noticeably cleaner than the urban centre. Genuinely dark skies are close in this direction, arriving at roughly 25 kilometres.
south-south-west - good
About 15 kilometres south-south-west of Mandurah, the sky is good at around Bortle 4. This is another strong option for a short stargazing drive, with genuinely dark skies reached at roughly 25 kilometres.
south-west - good
About 15 kilometres south-west of the city, the sky is good, around Bortle 4. A substantial improvement comes quickly here, with genuinely dark skies appearing at roughly 25 kilometres.
west-south-west - good
About 15 kilometres west-south-west of Mandurah, the sky is good at around Bortle 4. This direction darkens quickly, with genuinely dark conditions reached at roughly 25 kilometres.
west - good
About 15 kilometres west of the city, the sky is good, around Bortle 4. Darker rural conditions are available after roughly 25 kilometres, making this a strong direction for a short trip.
west-north-west - good
About 15 kilometres west-north-west of Mandurah, the sky is good at around Bortle 4. Genuinely dark skies are reachable farther out, appearing at roughly 25 kilometres.
north-west - good
About 15 kilometres north-west of the city, the sky is good, around Bortle 4. It improves more gradually than the western and southern options, with genuinely dark skies reached at roughly 50 kilometres.
north-north-west - fair
About 15 kilometres north-north-west of Mandurah, the sky is fair at around Bortle 5. Better conditions do come with distance, but genuinely dark skies are not reached until roughly 100 kilometres out.
zenith - poor
Directly overhead in Mandurah, the sky is poor by dark-sky standards, at Bortle 7. You can still make out the brighter constellations and major star patterns, but the background glow reduces contrast, and many fainter stars that would normally fill in the sky are missing.
-
Near Shire of Three Springs, Western Australia
- Direction
- W
- Distance (km)
- 311.6
- SQM
- 21.77
- Bortle
- 2
Milky Way, faint nebulae, deep-sky imaging
-
Near Shire of Kojonup, Western Australia
- Direction
- SSE
- Distance (km)
- 183.5
- SQM
- 21.64
- Bortle
- 3
Milky Way visible, broadband DSO imaging
-
Near Shire of Donnybrook-Balingup, Western Australia
- Direction
- S
- Distance (km)
- 128.3
- SQM
- 21.44
- Bortle
- 3
Milky Way visible, broadband DSO imaging
Useful darker skies are fairly accessible from Mandurah, but the best truly dark conditions still need a proper journey. The nearest named standout site is about 185 kilometres to the south-south-east near Shire of Kojonup, Western Australia, where the skies reach a very dark rural standard.
If you only want a shorter trip, heading south, south-west or west already brings a worthwhile improvement, with reasonable dark-sky conditions appearing after roughly 25 kilometres.
-
Within 200 km
- Place
- Near Shire of Kojonup, Western Australia
- Direction
- SSE
- Distance (km)
- 183.5
- SQM
- 21.64
- Bortle
- 3
-
Within 500 km
- Place
- Near Shire of Three Springs, Western Australia
- Direction
- W
- Distance (km)
- 311.6
- SQM
- 21.77
- Bortle
- 2
Long-term light pollution trend
Mandurah's long-term pattern is fairly steady, but with a slight drift towards brighter skies over time. The earliest reading in the record was 19.47 SQM, compared with 19.33 SQM in the latest measurement.
That change is small in year-to-year terms, and the overall average of 19.56 SQM suggests the city has remained in broadly the same observing bracket for much of the record. The fitted trend is a gentle decline of 0.0042 SQM per year, which points to gradual worsening rather than any dramatic shift.
The wider historical range, from 19.26 to 22.00 SQM, shows that conditions in the broader dataset have varied substantially, but the current figure sits toward the brighter end of Mandurah's recorded history.
From within Mandurah, the easiest and most rewarding targets are bright, high-contrast ones. The Moon, planets and double stars cope well with the local skyglow, and the brightest open clusters can still be enjoyable in binoculars or a small telescope.
A handful of showpiece deep-sky objects remain possible, especially if they are compact and bright, but they tend to lose subtle detail. Objects that depend on low surface brightness — such as the Milky Way, faint galaxies and broad diffuse nebulae — are much better saved for a darker site outside the city.
In short, Mandurah is perfectly usable for casual astronomy, but a short drive makes a very noticeable difference if deep-sky observing is your priority.
- 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 Mandurah?
Yes — plenty of the brighter stars and the main constellation patterns are visible from Mandurah. What you lose are many of the fainter stars that make the sky look richly crowded from darker locations.
Can you see the Milky Way from Mandurah?
From within the city, the Milky Way is usually very difficult to see well and may be absent altogether to many observers. For a proper Milky Way view, you are much better off driving out to darker country skies.
What Bortle class is Mandurah?
Mandurah is Bortle Class 7, which is an urban-to-suburban transition sky. In practical terms, that means bright targets do well, while faint deep-sky observing is quite limited from the city itself.
What is the SQM reading for Mandurah?
The measured sky brightness for Mandurah is 19.33 SQM. That is bright enough to noticeably suppress faint stars and reduce contrast in deep-sky objects.
Where are the nearest dark skies to Mandurah?
The quickest meaningful improvement is generally to the south, south-west and west, where genuinely dark skies appear after roughly 25 kilometres in the best directions. The nearest named standout site in the supplied data is Near Shire of Kojonup, Western Australia, about 183.5 kilometres to the south-south-east.
Is Mandurah good for astrophotography?
It can be good for lunar, planetary and brighter narrow-field astrophotography from within the city. For wide-field Milky Way work, faint nebulae or cleaner deep-sky contrast, you will get much better results by travelling to a darker site.
How far do you need to drive from Mandurah for darker skies?
A worthwhile improvement can come with a short drive, especially towards the south and west. For truly dark rural skies, you are generally looking at anything from about 25 kilometres in the best directions to around 185 kilometres for the nearest named top-quality site.