Portland, OR — light pollution & stargazing
Portland, Oregon has a light-pollution rating of about Bortle 9 — a inner-city sky (very poor — city glow) — measured from VIIRS 2024 satellite night-lights at 115 nW/cm²/sr at the town center. Only the Moon, the bright planets, and a scattering of the very brightest stars pierce the glow. For real stargazing you'll want to drive to a darker site. The nearest genuinely darker skies are around Milwaukie, OR (about 6 mi away, Bortle 7). 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 Portland tonight
- Estimated Bortle class
- 9 of 9
- VIIRS radiance (town center)
- 115 nW/cm²/sr
- Naked-eye limiting mag.
- under 4.1
- Milky Way
- not visible
Inner-city sky. A satellite upward-radiance proxy for planning — not a survey-grade sky-brightness reading.
What you can see from Portland
Only the Moon, the bright planets, and a scattering of the very brightest stars pierce the glow. For real stargazing you'll want to drive to a darker site.
Darker skies within reach
The nearest town in each darker class — your ladder from Portland's sky toward truly dark skies.
| Town | State | Bortle | Sky | Drive |
|---|---|---|---|---|
| Milwaukie | OR | 7 | Suburban / urban transition | 6 mi |
| Beaverton | OR | 8 | City sky | 7 mi |
| Lake Oswego | OR | 6 | Bright suburban sky | 7 mi |
| Oatfield | OR | 5 | Suburban sky | 8 mi |
| Camano | WA | 4 | Rural / suburban transition | 185 mi |
Frequently asked questions
- Can you see the Milky Way from Portland, OR?
- Not really. At about Bortle 9 the Milky Way is not visible from Portland — the sky is too light-polluted. The nearest genuinely dark skies are around Milwaukie, OR, about 6 mi away.
- How dark is the sky in Portland?
- Portland rates a inner-city sky — about Bortle 9, with a naked-eye limiting magnitude around under 4.1. That comes from a VIIRS satellite night-lights reading of 115 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 Portland?
- The nearest town with genuinely darker skies is Milwaukie, OR — about 6 mi away at roughly Bortle 7. See the "darker skies within reach" list on this page for more options.
- Can I see the aurora from Portland 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 Oregon
See every town's darkness rating in Oregon, learn to read the Bortle scale, or check tonight's Moon phase.