Aurora Borealis in Clydach
United Kingdom · 51.68°, -3.90° · geomagnetic 54.2° · needs Kp 7
Tonight's aurora forecast for Clydach
2%
Peak chance of a visible display tonight, from the same model the Revon app runs. Clydach 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 Clydach
Auroras are visible at Clydach when the geomagnetic activity reaches Kp 7 or higher. This level of activity is expected to occur on approximately 2.7 nights per year.
The geomagnetic latitude of Clydach is 54.2°.
The best months for viewing auroras in Clydach are September, August, and November. During these months, the nights are typically dark enough to observe the aurora.
June and July experience periods without full darkness, which may impact viewing opportunities.
Clydach is situated in an area with a Bortle 4 rating, indicating a relatively dark sky. Areas to the north-west near Swansea also have a Bortle 4 rating.
The horizon to the east is marked by Mynydd Drumau, a hill 3.7 km away. To the north, Craig yr Allt, another hill, is located 3.9 km away. Further east, Cefnmawr mountain is 17.2 km distant. The Black Mountain, a mountain 21.9 km to the north-east, and Craig y Llyn, a cliff 22.6 km to the east-north-east, also feature in the surrounding landscape.
Between 2016 and 2026, there have been an average of 2.7 nights per year with conditions suitable for aurora viewing in Clydach.
The historical record shows qualifying aurora nights on 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 location dataset · 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)
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Forecasts for places within reach of Clydach.