Upper Saint Clair, PA — light pollution & stargazing
Upper Saint Clair, Pennsylvania has a light-pollution rating of about Bortle 5 — a suburban sky (fair — suburban) — measured from VIIRS 2024 satellite night-lights at 6.1 nW/cm²/sr at the town center. Only faint traces of the Milky Way survive, and only near the zenith on the clearest nights. The Andromeda Galaxy is a challenge with the naked eye; a telescope still shows plenty. The nearest genuinely darker skies are around Green Valley, MD (about 165 mi away, Bortle 4). 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 Upper Saint Clair tonight
- Estimated Bortle class
- 5 of 9
- VIIRS radiance (town center)
- 6.1 nW/cm²/sr
- Naked-eye limiting mag.
- 5.6–6.0
- Milky Way
- faint, only near the zenith
Suburban sky. A satellite upward-radiance proxy for planning — not a survey-grade sky-brightness reading.
What you can see from Upper Saint Clair
Only faint traces of the Milky Way survive, and only near the zenith on the clearest nights. The Andromeda Galaxy is a challenge with the naked eye; a telescope still shows plenty.
Darker skies within reach
The nearest town in each darker class — your ladder from Upper Saint Clair's sky toward truly dark skies.
| Town | State | Bortle | Sky | Drive |
|---|---|---|---|---|
| Green Valley | MD | 4 | Rural / suburban transition | 165 mi |
Frequently asked questions
- Can you see the Milky Way from Upper Saint Clair, PA?
- Barely. At about Bortle 5 the Milky Way is faint and only shows near the zenith on the clearest, moonless nights. For a clear view, head toward Green Valley, MD (~165 mi).
- How dark is the sky in Upper Saint Clair?
- Upper Saint Clair rates a suburban sky — about Bortle 5, with a naked-eye limiting magnitude around 5.6–6.0. That comes from a VIIRS satellite night-lights reading of 6.1 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 Upper Saint Clair?
- The nearest town with genuinely darker skies is Green Valley, MD — about 165 mi away at roughly Bortle 4. See the "darker skies within reach" list on this page for more options.
- Can I see the aurora from Upper Saint Clair 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 Pennsylvania
See every town's darkness rating in Pennsylvania, learn to read the Bortle scale, or check tonight's Moon phase.