Port Saint John, FL — light pollution & stargazing
Port Saint John, Florida has a light-pollution rating of about Bortle 5 — a suburban sky (fair — suburban) — measured from VIIRS 2024 satellite night-lights at 7.1 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 On Top of the World, FL (about 100 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 Port Saint John tonight
- Estimated Bortle class
- 5 of 9
- VIIRS radiance (town center)
- 7.1 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 Port Saint John
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 Port Saint John's sky toward truly dark skies.
| Town | State | Bortle | Sky | Drive |
|---|---|---|---|---|
| On Top of the World | FL | 4 | Rural / suburban transition | 100 mi |
Frequently asked questions
- Can you see the Milky Way from Port Saint John, FL?
- 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 On Top of the World, FL (~100 mi).
- How dark is the sky in Port Saint John?
- Port Saint John 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 7.1 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 Port Saint John?
- The nearest town with genuinely darker skies is On Top of the World, FL — about 100 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 Port Saint John 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 Florida
See every town's darkness rating in Florida, learn to read the Bortle scale, or check tonight's Moon phase.