Monterrey Stargazing & Astronomy Report

Key Sky Quality Metrics

SQM (mag/arcsec²)

17.81

Bortle class

Class 9 (Class 9)

Darkness Quotient

21%

Dataset

May 2026

Inner city sky

Monterrey: The Practical Verdict

Monterrey is a significant global metropolis located in Nuevo León, Mexico. Unfortunately, its night skies are severely affected by urban light pollution, making it a challenging environment for stargazing. Only the brightest celestial bodies, such as the Moon, planets, and a handful of bright stars, are visible.

In this highly light-polluted urban sky, attempts at deep-sky observing are largely futile, with the Milky Way entirely obscured. Nonetheless, there is still potential for narrowband imaging of the brighter nebulae and solar system events if care is taken to mitigate the effects of the intense light pollution. The eastern horizon is particularly bright, with the best observational clarity towards the south.

For an improved stargazing experience, consider venturing to San Juan de Vanegas, San Luis Potosí, approximately 210 km south-south-west. Here, you will find significantly darker skies, suitable for enjoying more vivid views of deep-sky objects.

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

San Juan de Vanegas, San Luis Potosí sits about 209 km south south west and reaches Bortle 3, roughly 29x 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 17.81, 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 17.81), 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 Agua Fria, Nuevo León, about 31 km south south west of Monterrey, reaching Bortle 5.

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 0.05 SQM per year.

• Agua Fria, Nuevo León

  Direction

  SSW

  Distance (km)

  30.8

  SQM

  20.48

  Bortle

  5

• San Juan de Vanegas, San Luis Potosí

  Direction

  SSW

  Distance (km)

  209.2

  SQM

  21.46

  Bortle

  3

• China, Nuevo León

  Direction

  E

  Distance (km)

  182.9

  SQM

  20.79

  Bortle

  5

• Flechadores, Tamaulipas

  Direction

  SE

  Distance (km)

  208.2

  SQM

  20.91

  Bortle

  4

• Mazapil, Zacatecas

  Direction

  SW

  Distance (km)

  259.4

  SQM

  21.49

  Bortle

  3