Aurora Borealis in Gelligaer
United Kingdom · 51.66°, -3.26° · geomagnetic 54.0° · needs Kp 7
Tonight's aurora forecast for Gelligaer
2%
Peak chance of a visible display tonight, from the same model the Revon app runs. Gelligaer needs Kp 7 to see anything at all, and tonight the forecast peaks at Kp 4.9. Short of the threshold, which is what most nights look like here.
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Updated 2026-09-08 10:36 UTC
Local aurora guide for Gelligaer
The aurora borealis is visible at Gelligaer on average 2.7 nights per year. This is based on historical data and a minimum geomagnetic activity level of Kp 7.
Gelligaer is located at 54.0° geomagnetic latitude. This latitude is considered favorable for aurora viewing.
The best months for aurora viewing in Gelligaer are September, August, and November. These months offer a good balance of darkness and potential aurora activity.
During June and July, there is not enough darkness for aurora viewing due to the extended daylight hours.
Gelligaer experiences a Bortle 5 sky, indicating moderate light pollution. Areas with darker skies, such as Bortle 4 near Neath Port Talbot (35 km west-north-west) and Bortle 5 near Blaenau Gwent (10 km north), are also noted.
The terrain around Gelligaer includes hills like Craig y Felin (4.6 km north) and Coed yr Hendre (5.5 km north-north-west), as well as ridges like Mynydd Merthyr (10.2 km west-north-west). Further north-north-west, Mynydd Llangynidr is a mountain (17.4 km away), and to the west-north-west, Craig y Llyn is a cliff (23.2 km away).
There have been 53 verified aurora sightings reported within 300 km of Gelligaer between January 2015 and December 2016.
The historical record shows viable aurora nights occurring on dates such as 2026-03-20 (Kp 7.0), 2026-01-20 (Kp 7.67), 2026-01-19 (Kp 8.67), 2025-11-12 (Kp 7.33), and 2025-11-11 (Kp 8.67).
Sources: Revon analysis of NOAA planetary Kp · Solar declination and hour-angle calculation · Falchi 2016 World Atlas of artificial night sky brightness · GeoNames (CC BY 4.0) · Aurorasaurus verified positive reports
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