San Bruno, CA Night Sky Brightness
How dark is the sky in San Bruno, CA?
San Bruno reads as suburban edge on this dataset's scale. A noticeable glow near the horizon. Brighter stars and constellations are easy to pick out; the Milky Way is washed out. San Bruno's sky is brighter than 18.6% of the 3,206 cities in this dataset.
Worth remembering: this is satellite radiance, not a ground observation. A true Bortle rating needs a human eye at night, this is the closest large-scale substitute, covered fully in the Bortle scale guide.
Where to go for a darker sky near San Bruno
3 miles from San Bruno, straight-line, sits Pacifica, CA, the nearest city here with a darker sky than San Bruno's own suburban edge band.
Pacifica, CA is itself still a measured city, not a designated dark-sky park, this only compares against the 3,206 places this dataset covers.
San Bruno against the rest of the dataset
San Bruno, CA has a population of about 42,035, one of 3,206 US cities of 10,000 or more residents in this dataset. Ranked against the other 3,206 cities here by the methodology guide's own sampling, San Bruno comes in at 593, darkest to brightest.