Northern lights forecast
for Blue Lagoon
Blue Lagoon, Iceland — about 63.5° geomagnetic latitude. On the Reykjanes peninsula near Grindavík — the social option. Watch while you soak; not a trip made for aurora alone.
Aurora at the Blue Lagoon tonight · live
Where to look
Face north, away from the resort's lights. This is not a dark site — it takes an active night. Foreground: the rising steam.
Can you see the aurora in Blue Lagoon?
Yes. From a dark site you need about Kp 2 for a faint glow low on the northern horizon, and roughly Kp 4 for bright aurora directly overhead. At 63.5° geomagnetic latitude Blue Lagoon sits on the edge of the oval — you want an active night.
Over the last 12 months the planetary Kp peaked at the levels Blue Lagoon needs on the days shown — out of 365. Kp is a global index, so these are the odds the sky was active enough; you still need clear, dark skies here. In 94 years on record the strongest day hit Kp 9.
The greatest storms on record: The Halloween storms (Oct 2003) · The Gannon storm (May 2024) · 13 Nov 1960
The full Kp archive, 1932 → today →When to go
The season runs mid August to late April, when the nights are long and dark. You also need clear skies and a low moon — even a strong Kp is useless under cloud. Check tonight's live call above, then plan a night around the dark window, cloud and moon.
Clearest dark months here (outlined): Mar, Nov, Dec. Faint: no night with an hour of astronomical darkness — white nights, twilight only (May, Jun, Jul, Aug). Part-faint months are dark on some nights only: dark until 8 Apr; dark from 2 Sep. ERA5 reanalysis, 2015–2024 monthly mean. Climatology, not a forecast — a regional ~25 km grid; local microclimates are not captured. Darkness & moon calendar → Best month, all spots →
Thresholds are averages from a dark site. Real visibility also needs clear skies, darkness and a cooperative moon — read every number as a chance, not a guarantee. The map is schematic: the oval is drawn around the geomagnetic pole and tuned to this place, so its edge reaches the marker at the Kp this page gives; the marker is approximate.