Northern lights in Isle of Arran tonight
Firth of Clyde, Scotland · 55° magnetic latitude · Kp 4-5 threshold
Kp 1 is well below the Kp 4-5 threshold needed for aurora to be visible from Isle of Arran.
7-day outlook for Isle of Arran
Based on CME arrival predictions from NASA DONKI. Arrival times ±6 hours.
auroratonight.space
What Kp is needed here?
Isle of Arran sits at a magnetic latitude of approximately 55°N. The Kp index - a global measure of geomagnetic activity on a scale from 0 (quiet) to 9 (extreme storm), updated every 3 hours - needs to reach Kp 4-5 before the auroral oval expands far enough south to be visible from here.
At Kp 4-5, visibility is possible from Isle of Arran but skies need to be clear and dark. Cloud cover and light pollution remain the main obstacles even when Kp is high enough.
Best dark sky sites near Isle of Arran
Light pollution is the biggest obstacle after cloud cover. These sites give you the best dark northern horizon within reach.
West coast (away from Brodick, Lamlash, and Whiting Bay)
Get directions ↗Arran has no official Dark Sky certification, but VisitArran's own guidance points to the island's west coast as the best area for stargazing, since the terrain there is lower and more open than the mountainous north around Goat Fell (874 m). The larger villages - Brodick, Lamlash, and Whiting Bay - have enough street lighting to be worth avoiding for a serious view. Arran is often called 'Scotland in miniature' for this same split between rugged north and gentler south.
Best time to see the northern lights in Isle of Arran
Isle of Arran's aurora season runs from late September through to March, when nights are long enough for truly dark skies. The equinox months, September and March, bring a natural boost in geomagnetic activity, making them statistically the best of the season. Summer months bring too much twilight for aurora to be visible at this latitude.
Activity peaks around the September and March equinoxes, when Earth's magnetic field geometry is most favourable for coupling with the solar wind. Events during these two windows tend to produce the strongest displays of the year for observers at Isle of Arran's latitude.
April through August brings persistent astronomical twilight that washes out aurora completely. Even strong events (Kp 6+) remain invisible during this period because the sky never gets dark enough.
Other Scotland aurora forecasts
Up to 8 locations
Related pages
Scotland Aurora Hub
All Scottish aurora locations with live forecast.
Read →Northern Lights Glasgow Tonight
Glasgow - Ardrossan ferry terminal is about an hour away.
Read →Northern Lights Galloway Forest Tonight
UK's first Dark Sky Park, similar Kp threshold.
Read →Northern Lights Argyll Tonight
Argyll mainland dark sky sites, just north of Arran.
Read →What Is the Kp Index?
What Kp 4-5 means for viewing from Arran.
Read →Aurora photographs from Isle of Arran
Real photos sourced from Wikimedia Commons.
Aurora over Isle of Arran
Aurora over Isle of Arran
Aurora over Isle of Arran
Aurora over Isle of Arran
Aurora over Isle of Arran
Aurora over Isle of ArranPlanning your aurora trip
In-depth guides to help you plan a trip to see the northern lights.
Travel GuideUKNorthern Lights Scotland - Complete Travel Guide
Shetland, Orkney, Highland coasts, and Galloway Forest - the UK's best aurora destinations.
PhotographyUKNorthern Lights Scotland - Photography Guide
Dark sky locations, foregrounds, and the best conditions for aurora photography in Scotland.
PhotographyUKScotland Aurora Photography Locations
Specific spots across the Highlands, Orkney, and Shetland rated for aurora photography.
