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.

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. Among all 3,206 cities here, San Bruno ranks 593 from darkest to brightest, 1 being the darkest measured.