Aurora Borealis in Horley
United Kingdom · 51.17°, -0.16° · geomagnetic 53.1° · needs Kp 7
Tonight's aurora forecast for Horley
1%
Peak chance of a visible display tonight, from the same model the Revon app runs. Horley 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.
Get the full 30-night forecast in Revon
Updated 2026-09-08 10:36 UTC
Local aurora guide for Horley
Horley is located at 53.1° geomagnetic latitude. Auroras are typically visible at this latitude when the Kp index reaches 7.
On average, there are about 2.7 nights per year in this region where conditions are suitable for aurora viewing.
The historical record for aurora sightings in this area spans from April 2, 2016, to March 30, 2026.
The best months for aurora viewing in Horley are September, August, and November.
During June and July, there is no full darkness, which can impact viewing conditions.
Horley experiences a Bortle 9 sky, indicating significant light pollution.
Areas with darker skies, such as Bortle 4, are located approximately 79 km to the south-east. Near Brighton, about 48 km to the south-south-east, the sky is Bortle 5.
Notable terrain features around Horley include Gay House Hill to the east-north-east, Redhill Common to the north-north-west, and Eyhurst Park to the north.
Gay House Hill is a hill located 5.0 km east-north-east of Horley.
Redhill Common is a hill situated 6.6 km north-north-west of Horley.
Castle Grounds, a park, is 7.9 km north-north-west of Horley. Mercers Lake is a lake 8.7 km north of Horley, and Eyhurst Park is a park 12.7 km north of Horley.
There have been 42 verified aurora reports within 300 km of Horley between January 1, 2015, and December 31, 2016.
The period from 2016 to 2026 has recorded several nights with significant geomagnetic activity, including Kp 7.0 on March 20, 2026, and Kp 8.67 on January 19, 2026, and November 11, 2025.
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) · Aurorasaurus verified positive reports
Know when it is worth going outside
Revon watches the Horley forecast and pushes an alert when the odds for tonight clear your threshold — no checking, no guessing.
Nearby towns
Forecasts for places within reach of Horley.