Aurora Borealis in Farnham
United Kingdom · 51.21°, -0.80° · geomagnetic 53.2° · needs Kp 7
Tonight's aurora forecast for Farnham
1%
Peak chance of a visible display tonight, from the same model the Revon app runs. Farnham 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 Farnham
Farnham is at 53.2° geomagnetic latitude. Auroras visible at this latitude require a Kp of 7 or higher.
On average, there are 2.7 nights per year with a Kp of 7 or higher. These conditions occurred between 2016 and 2026.
The darkest months in Farnham are from September to November. During these months, the sky is fully dark.
June and July do not have full darkness.
Farnham has a Bortle scale rating of 7, indicating significant light pollution.
Areas with less light pollution include Bortle 4 skies 81 km south and Bortle 5 skies 39 km south-west near Winchester.
Local terrain includes Horsedown Common (hill, 7.3 km west), Hogs Back (ridge, 7.7 km east), Ramillies Park (park, 7.7 km north-north-east), Romping Downs (hill, 9.5 km north-east), and Shalford Park (park, 16.0 km east).
Horsedown Common is a hill located 7.3 km west of Farnham.
Hogs Back is a ridge located 7.7 km east of Farnham.
Ramillies Park is a park located 7.7 km north-north-east of Farnham. Romping Downs is a hill located 9.5 km north-east of Farnham. Shalford Park is a park located 16.0 km east of Farnham.
There were 45 verified aurora reports within 300 km of Farnham between 2015 and 2016.
The historical record shows qualifying nights occurred 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 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 Farnham 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 Farnham.