Monterrey Stargazing & Astronomy Report

Key Sky Quality Metrics

SQM (mag/arcsec²)

17.85

Bortle class

Class 9 (Class 9)

Darkness Quotient

22%

Dataset

April 2026

Inner city sky

Monterrey: The Practical Verdict

Monterrey is a major city in Nuevo León, Mexico, with a dense urban environment. The sky quality is severely impacted here, rated as Class 9 Bortle within the metropolitan area, offering a highly limited observational window even for the brightest objects. Light pollution is the predominant issue, making deep-sky astrophotography and Milky Way visual observation effectively impossible.

The limited sky allows observations of brighter targets such as the Moon, planets, and well-separated double stars. Narrowband imaging can be pursued cautiously for some bright emission nebulae, though surrounding gradients are heavy and colours struggle against the urban glow. Fainter objects and general deep-sky work remain unfeasible.

For a distinctly darker experience, El Milagro, Tamaulipas, provides a strong upgrade option about 205 km east south-east, where the skies improve to Bortle 4 with Milky Way visibility and productive observation conditions for a wider range of targets.

At a Glance

Overall

Severe urban sky - This is a severely light-polluted urban sky. Only the Moon, planets, bright stars, and a few specialist targets remain practical.

Milky Way

Not visible - The Milky Way is not visible from this sky.

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

El Milagro, Tamaulipas sits about 207 km east south east and reaches Bortle 4, roughly 23x darker.

Good dark window

Monterrey'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 Monterrey?

No. Monterrey is a Bortle Class 9 sky with SQM 17.85, 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 Monterrey?

Monterrey is Bortle Class 9 (SQM 17.85), a severe urban sky for astronomy.

Is Monterrey good for stargazing?

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

Is Monterrey good for astrophotography?

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

What can you observe from Monterrey?

Primary targets from Monterrey 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 Monterrey?

The closest meaningfully darker mapped site is La Placeta del Pino, Nuevo León, about 26 km south west of Monterrey, reaching Bortle 6.

When is the sky darkest in Monterrey?

The sky over Monterrey is darkest around January, December.

Is light pollution in Monterrey getting better or worse?

The long-term trend for Monterrey is gradually worsening, with the sky brightening by about 0.06 SQM per year.

• La Placeta del Pino, Nuevo León

  Direction

  SW

  Distance (km)

  26.3

  SQM

  20.22

  Bortle

  6

• Agua del Toro, Coahuila

  Direction

  WSW

  Distance (km)

  33.8

  SQM

  19.99

  Bortle

  6

• El Milagro, Tamaulipas

  Direction

  ESE

  Distance (km)

  206.8

  SQM

  21.26

  Bortle

  4

• Mazapil, Zacatecas

  Direction

  SW

  Distance (km)

  254.5

  SQM

  21.40

  Bortle

  3