San Marcos, CA Night Sky Brightness
San Marcos, CA's night sky, measured from orbit
San Marcos reads as suburban on this dataset's scale. Light dome dominates much of the sky. Only the brightest stars and planets stand out clearly. San Marcos's sky is brighter than 83.5% of the 3,206 cities in this dataset.
Note the source: a satellite reading of upward light, not a visual Bortle scale reading. The two measure related but different things, explained in the Bortle scale guide.
Where to go for a darker sky near San Marcos
Vista, CA, about 6 miles away as the crow flies, measures in the suburban edge band, one step darker than San Marcos. Actual driving distance will run longer than that straight-line figure.
Vista, CA is itself still a measured city, not a designated dark-sky park, this only compares against the 3,206 places this dataset covers.
How San Marcos compares nationally
San Marcos, CA has a population of about 96,620, one of 3,206 US cities of 10,000 or more residents in this dataset. San Marcos's position, 2,661 of 3,206, darkest to brightest, comes from the sampling method the methodology guide sets out.