San Bernardino Stargazing & Astronomy Report

Light pollution and stargazing locations near San Bernardino

City
San Bernardino
Country
United States
Latitude
34.1083
Longitude
-117.2898

Key Sky Quality Metrics

SQM (mag/arcsec²)
17.74
Bortle class
Class 9 (Class 9)
Darkness Quotient
21%
Dataset
March 2026

Inner city sky

San Bernardino: The Practical Verdict

San Bernardino is a large Inland Southern California city on the eastern side of the Los Angeles urban region, set against mountain and desert landscapes but firmly embedded in a vast metropolitan corridor.

The city generally experiences High Light Pollution, with a Darkness Quotient of 21% — placing it among the more light-polluted urban skies in the United States, though not quite at the absolute worst extreme.

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 objects such as Orion Nebula and the brightest globular clusters can be attempted, but faint galaxies, dim nebulae and the Milky Way are largely overwhelmed by skyglow.

Meaningfully darker skies are not close at hand, but there is a clear improvement once you head east. The nearest reasonable dark-sky option is about 55 kilometres away near Near San Bernardino County, California, where conditions improve to a genuinely useful level for deep-sky observing.

The map shows San Bernardino sitting inside a broad, intense urban glow, with the brightest pink-white core merging into a much larger belt of red, orange and yellow light across the surrounding metropolitan area. Rather than appearing as an isolated pool of light, the city is part of a continuous bright region that spreads widely to the west and south-west.

The strongest contrast appears away from that built-up corridor, where the colours shift through green and blue into darker grey-black territory. The clearest darker country lies mainly to the east and north-east, while the south-east looks more mixed, with brighter patches interrupting the darker background.

In relative terms, San Bernardino is much brighter than the rural areas beyond the metro edge, but it is not the sole source of the region's skyglow. The wider pattern suggests that escaping the city's immediate light dome is possible with a drive, yet truly dark horizons depend on getting well beyond the broader urban basin.

What the overhead sky is like

Looking straight up from San Bernardino, the zenith is still heavily affected by urban skyglow rather than offering a dark window above the city. At 17.74 SQM, the overhead sky is bright enough that the background never becomes properly black to the eye.

In practice, familiar constellations remain visible, but they appear thinned out, with many of the fainter stars washed away. The Moon and planets stand out easily, while richer star fields lose much of their texture and contrast.

For casual stargazing this still leaves plenty to enjoy, but for deep-sky observing the city zenith is a major limiting factor. Even before looking toward the horizons, the sky overhead is already bright enough to suppress subtle detail in nebulae and galaxies.

north - marginal

About 15 kilometres north of the city, the sky is still only marginal, sitting around Bortle 6. It does improve with distance, and genuinely dark conditions are reached at roughly 100 kilometres in this direction.

north-north-east - marginal

Around 15 kilometres to the north-north-east, conditions remain marginal at about Bortle 6. The improvement is steadier than in some directions, with very dark skies only appearing much farther out at roughly 200 kilometres.

north-east - marginal

At roughly 15 kilometres to the north-east, the sky is still marginal, around Bortle 6, so brighter deep-sky targets remain the realistic limit. A much better sky is reachable farther out, with genuinely dark conditions appearing at about 100 kilometres.

east-north-east - marginal

The east-north-east direction is still marginal at around 15 kilometres, with Bortle 6 conditions. It improves well with distance, reaching genuinely dark skies at about 100 kilometres.

east - poor

Fifteen kilometres east of San Bernardino, the sky is still poor at about Bortle 7. The outlook improves notably farther out, becoming good by around 50 kilometres and reaching genuinely dark conditions at roughly 200 kilometres.

east-south-east - poor

Around 15 kilometres east-south-east, the sky remains poor at about Bortle 7. This route improves more slowly at first, and genuinely dark conditions do not arrive until roughly 200 kilometres out.

south-east - poor

At about 15 kilometres to the south-east, conditions are still poor, around Bortle 7. There is some improvement farther out, but genuinely dark skies are not reached within the sampled distance in this direction.

south-south-east - poor

Fifteen kilometres south-south-east of the city, the sky is still poor at around Bortle 7. It does get better with a long journey, eventually reaching good conditions, but genuinely dark skies are not within the sampled radius this way.

south - poor

Around 15 kilometres south, the sky remains poor at about Bortle 8, with strong urban glow still dominating. Even much farther out, this direction never reaches genuinely dark conditions within the sampled distance.

south-south-west - poor

The south-south-west remains poor even at about 15 kilometres, where conditions are around Bortle 9. There is a substantial improvement only much farther out, with genuinely dark skies appearing at roughly 200 kilometres.

south-west - poor

At roughly 15 kilometres to the south-west, the sky is still poor at about Bortle 8. Conditions improve with a longer drive, but genuinely dark skies are only reached at around 200 kilometres.

west-south-west - poor

Fifteen kilometres west-south-west of San Bernardino, the sky is still poor at about Bortle 9. This is one of the most light-polluted directions nearby, and truly dark conditions only appear much farther away at roughly 200 kilometres.

west - poor

Around 15 kilometres west, the sky remains poor at about Bortle 9, with the wider metropolitan glow very apparent. It improves only slowly, and genuinely dark skies are not reached within the sampled distance in this direction.

west-north-west - poor

At about 15 kilometres west-north-west, the sky is still poor at around Bortle 8. Farther out it becomes more usable, and genuinely dark conditions appear only after a long run of roughly 200 kilometres.

north-west - poor

Fifteen kilometres north-west of the city, conditions are still poor at about Bortle 7. There is a modest improvement with distance, but genuinely dark skies are not reached within the sampled radius in this direction.

north-north-west - marginal

Around 15 kilometres north-north-west, the sky is marginal at about Bortle 6. It improves gradually, with genuinely dark conditions only showing up much farther out at roughly 200 kilometres.

zenith - poor

Looking straight up from San Bernardino, the zenith is poor, with Bortle 9 conditions overhead. The brightest stars and main constellation outlines still show through, but the sky background is bright and washed out, and the Milky Way is effectively lost from view.

  • Near Inyo County, California
    Direction
    SE
    Distance (km)
    294.8
    SQM
    21.51
    Bortle
    3

    Milky Way visible, broadband DSO imaging

  • Near Searchlight Township, Nevada
    Direction
    ENE
    Distance (km)
    270.9
    SQM
    21.38
    Bortle
    3

    Milky Way visible, broadband DSO imaging

  • Near San Bernardino County, California
    Direction
    E
    Distance (km)
    54
    SQM
    20.92
    Bortle
    4

    Bright nebulae, galaxies, narrowband imaging

Historical Light Pollution Trends

San Bernardino's night sky has brightened modestly over the long term. The earliest reading in this series was 18.14 SQM, while the latest is 17.74 SQM, a decline of 0.40 SQM overall.

That works out to a gradual downward trend of about 0.02 SQM per year across 76 datasets. In practical terms, the city was already heavily light-polluted at the start of the record, and the data suggests that conditions have become a little brighter again rather than meaningfully improving.

The range across the full series is fairly small, from 17.74 to 18.14 SQM. That points to a sky environment that is consistently bright, with only limited variation from one dataset to another.