San Bernardino Stargazing & Astronomy Report

Key Sky Quality Metrics

SQM (mag/arcsec²)

17.74

Bortle class

Class 9 (Class 9)

Darkness Quotient

21%

Dataset

May 2026

Inner city sky

San Bernardino: The Practical Verdict

San Bernardino is a small city in southern California, situated in a suburban setting east of Los Angeles. The overall quality for astronomy here is heavily compromised by severe urban sky conditions, with high light pollution rendering it a Class 9 sky on the Bortle scale. The primary limiting factor is the intense illumination from nearby urban areas.

The Milky Way is completely obscured, and deep-sky observing is not feasible. Observers should focus on the Moon, planets, bright stars, and double stars. Narrowband imaging is possible only with great care. For serious stargazers, a significant improvement in sky quality can be achieved by heading west south west to Ventura County, approximately 225 km away, where much darker skies offer a more rewarding observing experience.

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

Ventura County, California sits about 225 km west south west and reaches Bortle 2, roughly 39x darker.

Good dark window

San Bernardino'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 San Bernardino?

No. San Bernardino is a Bortle Class 9 sky with SQM 17.74, 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 San Bernardino?

San Bernardino is Bortle Class 9 (SQM 17.74), a severe urban sky for astronomy.

Is San Bernardino good for stargazing?

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

Is San Bernardino good for astrophotography?

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

What can you observe from San Bernardino?

Primary targets from San Bernardino 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 San Bernardino?

The closest meaningfully darker mapped site is Wildhorse Canyon, California, about 40 km north west of San Bernardino, reaching Bortle 6.

When is the sky darkest in San Bernardino?

The sky over San Bernardino is darkest around January, December.

Is light pollution in San Bernardino getting better or worse?

Long-term light pollution over San Bernardino has been broadly stable across the available measurements.

• Vivian Creek Trail, California

  Direction

  E

  Distance (km)

  42.1

  SQM

  20.25

  Bortle

  6

• Wildhorse Canyon, California

  Direction

  NW

  Distance (km)

  39.6

  SQM

  20.06

  Bortle

  6

• Los Angeles County, California

  Direction

  SW

  Distance (km)

  175

  SQM

  21.64

  Bortle

  3

• Big Springs Ridge Trail, California

  Direction

  WSW

  Distance (km)

  134.2

  SQM

  20.29

  Bortle

  6

• Ventura County, California

  Direction

  WSW

  Distance (km)

  225

  SQM

  21.72

  Bortle

  2