Guayaquil Stargazing & Astronomy Report

Light pollution and stargazing locations near Guayaquil

City
Guayaquil
Country
Ecuador
Latitude
-2.1700
Longitude
-79.9224

Key Sky Quality Metrics

SQM (mag/arcsec²)
17.88
Bortle class
Class 9 (Class 9)
Darkness Quotient
22%
Dataset
March 2026

Inner city sky

Stargazing in Guayaquil

Guayaquil is Ecuador’s largest city and principal port, a hot, fast-moving coastal metropolis on the Pacific lowlands with a strongly urban character.

The city generally sits in the High Light Pollution tier, with a Darkness Quotient of 22% — making it one of the more light-polluted major cities for night-sky observing.

In practical terms, the most realistic targets from within the city are the Moon, the brighter planets, double stars and the very brightest open clusters. Fainter deep-sky objects are heavily washed out by the urban glow, though a few showpiece objects can still be attempted with patience.

Meaningfully darker skies do exist, but they are not right on the doorstep. The nearest reasonable step up is about 75 kilometres to the north-west, near Near Parroquia Cascol, ManabĂ­, while still darker skies are found farther away to the east-south-east near Near Parroquia Flavio Alfaro, ManabĂ­.

The map shows Guayaquil as a strong bright core with a vivid white-pink centre surrounded by broad yellow and green spill, which is exactly what you would expect from a large, intensely lit urban area. The surrounding glow spreads well beyond the city itself, so the light dome affects a wide swathe of the nearby landscape rather than stopping sharply at the edge of the built-up area.

Away from the centre, the pattern breaks into smaller bright patches dotted through the region, suggesting other settlements and transport corridors adding to the general skyglow. The cleanest-looking areas on this crop are the darkest grey and black zones, especially out toward the open water to the west and in more remote pockets farther from the main urban cluster.

Compared with its surroundings, Guayaquil clearly dominates the map as the brightest source in the immediate area. There are darker regions in several directions once you get beyond the wider urban halo, but the city’s footprint is large enough that truly dark conditions only begin to appear after a worthwhile journey.

How the sky looks overhead

Looking straight up from Guayaquil, the sky is heavily affected by urban light, with a zenith reading of 17.88 SQM. This is the kind of overhead brightness where the background never becomes properly dark, and the sky tends to look pale rather than richly black.

Under conditions like these, the main constellations are still there, but they appear simplified, with many of their fainter stars missing from view. The brightest stars and planets stand out well enough, yet the overall impression is of a sky dominated by city glow rather than by fine detail.

For casual observing, that still leaves plenty to enjoy in the Solar System and among the brighter stellar targets. For anything subtle — especially faint galaxies, dim nebulae or the richer star clouds of the Milky Way — a darker site makes a dramatic difference.

north - marginal

About 15 kilometres north of Guayaquil, the sky is marginal, around Bortle 6, so brighter constellations and the more obvious targets remain the practical focus. Genuinely dark skies are reachable farther out in this direction at about 100 kilometres, where conditions improve to Bortle 3.

north-north-east - poor

Around 15 kilometres north-north-east, the sky remains poor at roughly Bortle 7, with heavy glow still masking fainter detail. Conditions improve strongly farther out, reaching genuinely dark Bortle 3 skies at about 100 kilometres.

north-east - poor

At roughly 15 kilometres to the north-east, conditions are still poor, around Bortle 7, so this is not yet a major escape from the city’s light dome. Much darker skies do appear farther out, with Bortle 3 reached at about 100 kilometres.

east-north-east - marginal

Around 15 kilometres east-north-east, the sky is marginal at about Bortle 6, giving some improvement over the city centre but not a truly dark horizon. If you keep going, this direction reaches Bortle 3 skies at about 100 kilometres.

east - poor

About 15 kilometres east of the city, the sky is still poor, around Bortle 7, so faint deep-sky observing remains difficult. A much better result comes only farther out, with Bortle 3 darkness appearing at about 100 kilometres.

east-south-east - poor

At around 15 kilometres east-south-east, conditions are poor, roughly Bortle 7, with substantial skyglow still in play. The picture improves well beyond that, reaching genuinely dark Bortle 3 skies at about 100 kilometres.

south-east - marginal

Around 15 kilometres to the south-east, the sky is marginal at about Bortle 6, so brighter objects are still the sensible targets. This direction improves nicely farther out, with Bortle 3 reached at about 100 kilometres.

south-south-east - poor

At roughly 15 kilometres south-south-east, the sky remains poor, around Bortle 7, with the city’s glow still clearly affecting the view. Properly dark skies arrive farther out, improving to Bortle 3 at about 100 kilometres.

south - marginal

About 15 kilometres south of Guayaquil, the sky is marginal at roughly Bortle 6, so it is better than the centre but still far from ideal. This is one of the more promising directions, with genuinely dark Bortle 3 conditions reached at about 50 kilometres.

south-south-west - marginal

Around 15 kilometres south-south-west, the sky is marginal, near Bortle 6, with moderate improvement but plenty of remaining glow. Darker skies are available farther on, reaching Bortle 3 at about 100 kilometres.

south-west - marginal

At roughly 15 kilometres south-west, conditions are marginal at about Bortle 6, so brighter targets remain the reliable option. A much more satisfying dark-sky experience arrives farther out, with Bortle 3 reached at about 100 kilometres.

west-south-west - poor

Around 15 kilometres west-south-west, the sky is still poor, around Bortle 7, so this is not yet a dark-sky direction on a short outing. It becomes far better with distance, reaching Bortle 3 at about 100 kilometres.

west - marginal

About 15 kilometres west of the city, the sky is marginal at roughly Bortle 6, offering some improvement but still obvious skyglow. This direction eventually becomes excellent, though it takes a long journey, with Bortle 2 reached at about 200 kilometres.

west-north-west - marginal

At around 15 kilometres west-north-west, conditions are marginal, about Bortle 6, so only the brighter end of the sky is comfortable to observe. Much darker skies are farther away here, improving all the way to Bortle 2 at about 200 kilometres.

north-west - marginal

Around 15 kilometres north-west, the sky is marginal at about Bortle 6, with enough glow to limit faint-object work. Better skies do open up farther out, reaching Bortle 3 at about 100 kilometres.

north-north-west - marginal

At roughly 15 kilometres north-north-west, the sky is marginal, near Bortle 6, so the city’s influence is still noticeable. This direction does improve, but the darkest sampled conditions only arrive much farther out, reaching Bortle 3 at about 200 kilometres.

zenith - poor

Looking straight up from Guayaquil, the zenith is poor at Bortle 9, with a bright urban background rather than a naturally dark sky. Familiar constellations are still traceable, but many fainter stars disappear, and the Milky Way is effectively lost in the glow.

  • Near Parroquia Flavio Alfaro, ManabĂ­
    Direction
    ESE
    Distance (km)
    198.2
    SQM
    21.34
    Bortle
    3

    Milky Way visible, broadband DSO imaging

  • Near Parroquia Cascol, ManabĂ­
    Direction
    NW
    Distance (km)
    76.3
    SQM
    21.18
    Bortle
    4

    Bright nebulae, galaxies, narrowband imaging

  • Near Parroquia Colimes, Guayas
    Direction
    SSW
    Distance (km)
    91.4
    SQM
    21.14
    Bortle
    4

    Bright nebulae, galaxies, narrowband imaging

Genuinely dark skies require a proper drive from Guayaquil rather than a quick hop out of town.

The nearest good step-change is about 75 kilometres to the north-west at Near Parroquia Cascol, ManabĂ­, where conditions reach Bortle 4. If you are willing to go much farther, around 200 kilometres east-south-east near Near Parroquia Flavio Alfaro, ManabĂ­, the sky improves again into Bortle 3 territory.

  • Within 100 km
    Place
    Near Parroquia Cascol, ManabĂ­
    Direction
    NW
    Distance (km)
    76.3
    SQM
    21.18
    Bortle
    4
  • Within 200 km
    Place
    Near Parroquia Flavio Alfaro, ManabĂ­
    Direction
    ESE
    Distance (km)
    198.2
    SQM
    21.34
    Bortle
    3

Long-term light pollution trend

The long-term picture for Guayaquil points towards a marked brightening of the night sky over time. The earliest reading in the series was 21.66 SQM, while the latest is 17.88 SQM, a substantial decline in natural darkness.

Across 75 datasets, the average reading is 18.21 SQM, with values ranging from 17.52 to 21.73 SQM. The overall trend slope of -0.0365 SQM per year indicates a steady deterioration rather than a one-off fluctuation.

In plain terms, Guayaquil appears to have become much less favourable for urban stargazing over the years. That helps explain why bright, high-contrast targets remain the sensible focus from within the city itself.

From central Guayaquil, the safest bets are bright, contrast-rich targets that can punch through heavy skyglow. The Moon and planets are the obvious standouts, and double stars or the brightest open clusters can still be rewarding.

A small number of showcase deep-sky objects can be attempted with compromises, especially if they are compact and bright. Even so, the city is not a natural setting for faint nebulae, galaxies or wide-field sky structure.

Once you get to a darker site outside the city, the observing menu expands dramatically. That is where the Milky Way, dimmer galaxies, broader nebulae and meteor watching become much more satisfying.

  • 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 Guayaquil?

Yes — you can still see stars from Guayaquil, especially the brighter ones and the main constellation patterns. The faintest stars are heavily suppressed by the city’s light pollution, so the sky looks much less crowded than it would from a dark site.

Can you see the Milky Way from Guayaquil?

Not realistically from the city itself. With a Bortle 9 sky and an SQM reading of 17.88, the Milky Way is overwhelmed by urban skyglow.

What Bortle class is Guayaquil?

Guayaquil is Bortle Class 9, which corresponds to an inner-city sky. In practice, that means severe light pollution and a strong limit on faint deep-sky observing.

What is the SQM reading for Guayaquil?

The measured sky brightness for Guayaquil is 17.88 SQM. That is a bright urban reading, consistent with difficult deep-sky viewing from within the city.

Where are the nearest dark skies to Guayaquil?

The nearest reasonable darker site listed here is Near Parroquia Cascol, ManabĂ­, about 76.3 kilometres to the north-west, where the sky reaches Bortle 4. For an even darker option, Near Parroquia Flavio Alfaro, ManabĂ­ lies 198.2 kilometres to the east-south-east and reaches Bortle 3.

Is Guayaquil good for astrophotography?

It can work for Lunar, planetary and some narrow-field bright-object astrophotography, but it is not well suited to faint wide-field deep-sky imaging from the city centre. For stronger results on nebulae, galaxies and Milky Way scenes, a darker location is a much better choice.

How far do you need to drive from Guayaquil for darker skies?

For a clear improvement, you are looking at roughly 75 to 90 kilometres, where listed sites north-west and south-south-west both reach Bortle 4. For genuinely dark Bortle 3 skies, the nearest named option in the supplied locations is about 198.2 kilometres away.