Napa, CA — light pollution & stargazing
Napa, 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 28 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 American Canyon, CA (about 9 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 Napa tonight
- Estimated Bortle class
- 7 of 9
- VIIRS radiance (town center)
- 28 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 Napa
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 Napa's sky toward truly dark skies.
| Town | State | Bortle | Sky | Drive |
|---|---|---|---|---|
| American Canyon | CA | 6 | Bright suburban sky | 9 mi |
| San Anselmo | CA | 5 | Suburban sky | 27 mi |
| Tamalpais-Homestead Valley | CA | 4 | Rural / suburban transition | 32 mi |
Frequently asked questions
- Can you see the Milky Way from Napa, CA?
- Not really. At about Bortle 7 the Milky Way is not visible from Napa — the sky is too light-polluted. The nearest genuinely dark skies are around American Canyon, CA, about 9 mi away.
- How dark is the sky in Napa?
- Napa 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 28 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 Napa?
- The nearest town with genuinely darker skies is American Canyon, CA — about 9 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 Napa 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.