Aurora for Port Saint Lucie, FL
No aurora expected in Port Saint Lucie tonight
Kp threshold for Port Saint Lucie: ~9. Tonight's forecast peak: 3.3.
Storm strengthKp 3.3 — Unsettled
Kp is a 0–9 scale of geomagnetic storm strength — the higher it is, the farther south the aurora reaches. What matters is geomagnetic latitude, not the latitude on a map: Port Saint Lucie sits at 36.5° geomagnetic (vs 27.3°N on the map), which needs about Kp 9.
Aurora reaches64°N (you: 27.3°N)
The southern edge of where the aurora is overhead tonight. You can sometimes catch it low on the northern horizon a few degrees farther south.
- Cloud cover1%
- Moon55% brightness
- Dark sky starts8:08 PM
Data as of Oct 19, 2026
Coming Up
Seeing the northern lights from Port Saint Lucie, FL
The number that decides whether Port Saint Lucie sees an aurora is not the latitude on a map. The auroral oval is centred on the geomagnetic pole, which sits over Arctic Canada near 80.7°N, 72.7°W — well off the geographic pole. Port Saint Lucie sits at 27.3°N on a map but about 36.5° geomagnetic, roughly 9.2° closer to the aurora than the map suggests.
That offset is why two cities on the same parallel can have very different odds. Portland, Maine and Boise, Idaho are both near 43.6°N, but Portland sits about 3° higher in geomagnetic latitude — close to a full Kp step — so the same storm that puts a glow on Portland's horizon can leave Boise with nothing.
For Port Saint Lucie the practical threshold is about Kp 9, which happens only during the strongest storms of a solar cycle. At that strength expect a low glow along the northern horizon — often easier for a camera than the eye. Stronger storms push the oval further south and lift the display higher up the sky.
When a storm is in range, find a spot with a clear, dark view of the northern horizon, away from city lights, after evening twilight ends. A bright moon or clouds will wash out a faint display, so the best nights pair a strong storm with clear, dark skies.