Northern lights in Cardiff tonight
South Wales · 51° magnetic latitude · Kp 7+ threshold
Kp 1 is well below the Kp 7+ threshold needed for aurora to be visible from Cardiff.
7-day outlook for Cardiff
Based on CME arrival predictions from NASA DONKI. Arrival times ±6 hours.
auroratonight.space
What Kp is needed here?
Cardiff sits at a magnetic latitude of approximately 51°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 7+ before the auroral oval expands far enough south to be visible from here.
At Kp 7+, visibility is possible from Cardiff 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 Cardiff
Light pollution is the biggest obstacle after cloud cover. These sites give you the best dark northern horizon within reach.
Brecon Beacons National Park
Get directions ↗An International Dark Sky Reserve about 40 minutes north of Cardiff. The Beacons give Bortle 3-4 conditions at altitude with a broad northern horizon. The closest major dark sky reserve to Cardiff and among the best in England and Wales.
Vale of Glamorgan Heritage Coast
Get directions ↗The clifftop above Llantwit Major and St Donat's faces south-west over the Bristol Channel, but gives open sky in all directions. About 25 minutes south-west of Cardiff. Dark enough for strong events during which the aurora can be high in the northern sky.
Rhondda Fawr valley head
Get directions ↗The upper Rhondda valley north of Treherbert becomes notably dark above the valley floor. The ridge above at around 500 m gives open sky to the north toward the Brecon Beacons. About 35 minutes from Cardiff.
Black Mountains - Hay Bluff
Get directions ↗The eastern Brecon Beacons around Hay Bluff above Hay-on-Wye give elevated north-facing positions at over 600 m. About 60 minutes from Cardiff via the A470. Properly dark, with open Bortle 3 conditions.
Best time to see the northern lights in Cardiff
At 51°N magnetic latitude, Cardiff sits at the lower end of regular aurora territory. Only the deep mid-winter months of November through January offer nights dark enough for aurora to be visible, and only then when a significant geomagnetic storm pushes the auroral oval this far south.
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 Cardiff's latitude.
Outside November through January, twilight is too bright for aurora viewing even during significant storms. The season is short, but the equinox months on either side of winter can extend it slightly when storm timing aligns.
Up to 8 locations
How often does the aurora appear in Cardiff?
Average nights per month the Kp reached Cardiff's threshold of 7+, from 15 years of geomagnetic data (2010–2024).
Counts the Kp 7+ threshold only - cloud cover and local darkness are not included.
Kp data: GFZ German Research Centre for Geosciences, CC BY 4.0
Plan your trip to Cardiff
Best window
The January to March window averages 0 aurora nights - the strongest consecutive stretch of the year.
How long to stay
Aurora at this latitude requires patience - allow as many nights as possible during January.
Related pages
Northern Lights UK
Live aurora forecast hub for all UK regions.
Read →Northern Lights Wales Tonight
Wales-wide aurora forecast.
Read →Northern Lights Brecon Beacons Tonight
The Brecon Beacons International Dark Sky Reserve is Cardiff's best aurora site.
Read →What Is the Kp Index?
Why Kp 7+ is needed at 51°N magnetic latitude.
Read →Best Time to See Northern Lights UK
Which months and solar conditions produce aurora at southern latitudes.
Read →Aurora photographs from Cardiff
Real photos sourced from Wikimedia Commons.
Aurora over Cardiff 
Aurora over Cardiff 
Aurora over Cardiff 
Aurora over Cardiff 
Aurora over Cardiff 
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