Monthly Aurora Guide
Aurora Probability by Month
Nights getting longer after the summer solstice. First aurora chance of the season — conditions improving rapidly through the month.
Good activity with around 12 hours of darkness. Autumn skies can be clear with crisp air. Strong aurora probability.
Excellent — long dark nights and increasing solar activity. One of the best months for aurora viewing in Iceland.
Best darkness of the year. Sunset before 16:00 gives maximum aurora window. Coldest month — dress accordingly.
Peak season. Long dark nights and statistically high KP activity. A classic Iceland aurora experience.
Still excellent conditions. Days are noticeably longer than December but darkness remains generous.
Good aurora opportunity with an added bonus — the spring equinox is statistically linked to increased geomagnetic activity.
Days lengthening rapidly. Last viable aurora month. Early April still offers dark hours; by month end the season ends.
Timing, Moon & Weather
Peak Viewing Hours
22:00 to 02:00 is the prime aurora window. Aurora can appear earlier, but full astronomical darkness in Iceland typically falls after 21:30 in winter.
The "midnight sector" effect means geomagnetic activity is statistically highest around local midnight, when your location faces directly into the magnetospheric tail — the most active aurora region.
Moon Phase Impact
A new moon gives the darkest skies — ideal for faint aurora. A full moon (phase ~0.5) won't block strong aurora but will wash out subtle displays. Plan around new moon dates for best results. AuroraVision shows the current moon phase on the Tonight page.
Weather — The Critical Factor
Clear skies are essential. Iceland's weather is notoriously unpredictable, but the weather window changes hour by hour. Check the cloud cover forecast before heading out. Even a gap in the clouds can reward patience with a spectacular display.
Spring Equinox Boost
Around the March and September equinoxes, geomagnetic activity is statistically 20–30% higher than average. This "Russell-McPherron effect" makes equinox months (March, September) particularly good for aurora despite shorter nights than mid-winter.
No Aurora May – August: Midnight Sun
Iceland experiences the midnight sun from late May to early August. During this period the sun never fully sets and the sky remains too bright for aurora — even during geomagnetic storms. The aurora is happening above you, but the sky is simply too bright to see it. Aurora season reliably starts again in September when Iceland transitions from long days back to long, dark nights.
Is Tonight the Night?
Check tonight's live conditions and the 5-day forecast to plan your aurora chase.