Aurora Borealis in Trowbridge
United Kingdom · 51.32°, -2.21° · geomagnetic 53.5° · needs Kp 7
Tonight's aurora forecast for Trowbridge
1%
Peak chance of a visible display tonight, from the same model the Revon app runs. Trowbridge 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 10:35 UTC
Local aurora guide for Trowbridge
Trowbridge is at a geomagnetic latitude of 53.5 degrees. Auroras are typically visible at this latitude during periods of high geomagnetic activity.
A minimum Kp index of 7 is generally required for auroras to be seen at this latitude. This indicates a strong geomagnetic storm.
On average, there are about 2.7 nights per year in this region where conditions are suitable for aurora viewing, based on historical data from 2016 to 2026.
The darkest months in Trowbridge are typically from September through November. During these months, the nights are long enough for aurora viewing.
However, June and July experience periods without full darkness, which can make aurora sightings less likely, even if geomagnetic activity is high.
Trowbridge experiences a Bortle 7 sky, indicating significant light pollution. This can make fainter auroras difficult to see.
Areas with darker skies, such as Bortle 4 conditions, are located approximately 97 km south-south-east of Trowbridge.
Closer to Trowbridge, Bortle 5 conditions can be found about 16 km east-south-east, near Wiltshire.
West-north-west of Trowbridge, the terrain includes hills like Shrub Down (6.4 km away) and Hayes Wood Hill (8.7 km away).
To the north-west, you will find Henrietta Park (12.6 km away) and Alice Park (12.7 km away).
Further west, Denny Island is located 28.1 km from Trowbridge.
Between 2016 and 2026, there were approximately 2.7 nights per year suitable for aurora viewing in the Trowbridge region.
Historical records show verified sightings in the wider area, with 53 reports logged between January 2015 and December 2016.
Notable recent qualifying nights, based on Kp index, include March 20, 2026 (Kp 7.0), January 20, 2026 (Kp 7.67), January 19, 2026 (Kp 8.67), November 12, 2025 (Kp 7.33), and November 11, 2025 (Kp 8.67).
Sources: Revon analysis of NOAA planetary Kp · Revon location dataset · 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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