San Mateo, CA — light pollution & stargazing
San Mateo, California has a light-pollution rating of about Bortle 7 — a suburban / urban transition (poor — bright suburban) — measured from VIIRS 2024 satellite night-lights at 34 nW/cm²/sr at the town center. The whole sky glows grayish-white. Only the brighter stars, the Moon, the planets, and a handful of the showiest clusters cut through; deep-sky observing is difficult. The nearest genuinely darker skies are around Burlingame, CA (about 3 mi away, Bortle 6). Tonight's Moon phase, cloud cover, and aurora odds load live below, computed in your browser. This is a satellite upward-radiance proxy for planning, not a survey-grade sky-brightness measurement.
Stargazing in San Mateo tonight
- Estimated Bortle class
- 7 of 9
- VIIRS radiance (town center)
- 34 nW/cm²/sr
- Naked-eye limiting mag.
- 4.6–5.0
- Milky Way
- not visible
Suburban / urban transition. A satellite upward-radiance proxy for planning — not a survey-grade sky-brightness reading.
What you can see from San Mateo
The whole sky glows grayish-white. Only the brighter stars, the Moon, the planets, and a handful of the showiest clusters cut through; deep-sky observing is difficult.
Darker skies within reach
The nearest town in each darker class — your ladder from San Mateo's sky toward truly dark skies.
| Town | State | Bortle | Sky | Drive |
|---|---|---|---|---|
| Burlingame | CA | 6 | Bright suburban sky | 3 mi |
| Hillsborough | CA | 5 | Suburban sky | 3 mi |
| Tamalpais-Homestead Valley | CA | 4 | Rural / suburban transition | 25 mi |
Frequently asked questions
- Can you see the Milky Way from San Mateo, CA?
- Not really. At about Bortle 7 the Milky Way is not visible from San Mateo — the sky is too light-polluted. The nearest genuinely dark skies are around Burlingame, CA, about 3 mi away.
- How dark is the sky in San Mateo?
- San Mateo rates a suburban / urban transition — about Bortle 7, with a naked-eye limiting magnitude around 4.6–5.0. That comes from a VIIRS satellite night-lights reading of 34 nW/cm²/sr at the town center. It is a satellite proxy for planning, not a survey-grade measurement.
- Where is the nearest dark sky to San Mateo?
- The nearest town with genuinely darker skies is Burlingame, CA — about 3 mi away at roughly Bortle 6. See the "darker skies within reach" list on this page for more options.
- Can I see the aurora from San Mateo tonight?
- It depends on tonight's space weather. The live panel on this page reads the current NOAA aurora forecast for your latitude, along with cloud cover and the Moon — most U.S. locations only see aurora during strong geomagnetic storms.
The darkness rating is measured from VIIRS satellite night-lights at the town center and is a proxy for planning, not a survey-grade sky-brightness measurement — and the darkest skies are usually a short drive out of any town. Tonight's Moon, cloud, and aurora figures are live third-party forecasts that can change. See the methodology for sources and limits.
More in California
See every town's darkness rating in California, learn to read the Bortle scale, or check tonight's Moon phase.