Aurora Borealis in Swanley
United Kingdom · 51.40°, 0.17° · geomagnetic 53.2° · needs Kp 7
Tonight's aurora forecast for Swanley
1%
Peak chance of a visible display tonight, from the same model the Revon app runs. Swanley 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 10:35 UTC
Local aurora guide for Swanley
Aurora activity is measured by the Kp index. A Kp of 7 is the minimum threshold for aurora visibility in Swanley.
The geomagnetic latitude of Swanley is 53.2°.
On average, there are 2.7 nights per year with aurora visibility in this region. The historical record spans from 2016 to 2026.
The best months for aurora viewing in Swanley are September, August, and November.
During June and July, there is no full darkness, which can impact aurora visibility.
Swanley experiences a Bortle 7 light pollution level.
Areas with Bortle 4 conditions are located 58 km east-north-east of Swanley.
Local terrain features include Dartford Heath (park, 4.4 km north-north-east), Central Park (park, 5.8 km north-east), Langdon Shaw (hill, 6.0 km west-north-west), Bean Hill (hill, 9.3 km east-north-east), and Stone Ness (headland, 9.6 km north-east).
Dartford Heath is a park located 4.4 km north-north-east of Swanley.
Central Park is a park situated 5.8 km north-east of Swanley.
Langdon Shaw is a hill located 6.0 km west-north-west of Swanley. Bean Hill is a hill 9.3 km east-north-east, and Stone Ness is a headland 9.6 km north-east.
There have been 46 verified aurora reports within 300 km of Swanley between January 2015 and December 2016.
Notable qualifying nights with high Kp values 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
Know when it is worth going outside
Revon watches the Swanley 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 Swanley.