Aurora Borealis in Cornwall
Canada · 45.02°, -74.73° · geomagnetic 54.4° · needs Kp 7
Tonight's aurora forecast for Cornwall
2%
Peak chance of a visible display tonight, from the same model the Revon app runs. Cornwall needs Kp 7 to see anything at all, and tonight the forecast peaks at Kp 5.0. 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 Cornwall
Cornwall is located at 54.4° geomagnetic latitude. Auroras are typically visible when the planetary geomagnetic activity reaches Kp 7 or higher.
With an average of 3.2 viable nights per year, aurora viewing requires patience and persistence. The record span for observations is from April 2, 2016, to March 30, 2026.
The best months for aurora viewing in Cornwall are May, August, and September. These months offer a good overlap between darker skies and the potential for aurora activity.
Cornwall experiences a Bortle 5 sky, indicating moderate light pollution. Areas with Bortle 4 conditions are found 81 km north near Grenville-sur-la-Rouge, and Bortle 5 conditions are present 3 km southwest near Cornwall.
Notable features around Cornwall include Farlingers Point and Pilon Island, both located 5.2 km east-north-east. First Crab, an island, is 5.4 km east, and Flanigans Point, a headland, is 7.7 km east-north-east. Lairds Hill, a hill, is situated 14.9 km north of Cornwall.
Between January 1, 2015, and December 31, 2016, there were 53 verified aurora reports within 300 km of Cornwall.
Notable qualifying nights with high geomagnetic activity include March 20, 2026 (Kp 7.0), January 20, 2026 (Kp 7.67), and January 19, 2026 (Kp 8.67). Additional significant nights were November 12, 2025 (Kp 7.33) and November 11, 2025 (Kp 8.67).
Sources: Revon analysis of NOAA planetary Kp · 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 Cornwall 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 Cornwall.