Aurora Borealis in Grantham
United Kingdom · 52.91°, -0.64° · geomagnetic 54.8° · needs Kp 7
Tonight's aurora forecast for Grantham
3%
Peak chance of a visible display tonight, from the same model the Revon app runs. Grantham 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 Grantham
The aurora borealis is visible at Kp 7, which is a strong geomagnetic storm. Grantham is at a geomagnetic latitude of 54.8 degrees.
On average, there are 2.7 nights per year when the aurora is visible at this latitude. This is based on data from 2016 to 2026.
The best months for aurora viewing in Grantham are September, August, and November. These months offer a good balance of darkness and aurora activity.
During June and July, there is not enough darkness for aurora viewing due to the extended daylight hours.
Grantham experiences a Bortle 6 sky, indicating moderate light pollution. However, darker skies can be found nearby.
Areas like South Kesteven, about 20 km south-south-east, offer a Bortle 5 sky. For even darker conditions, King's Lynn and West Norfolk, about 63 km east-south-east, provide a Bortle 4 sky.
Local terrain features include Summerfield's Hill to the north, Normanton Hill to the north-north-east, and Newark Island to the north-west.
Summerfield's Hill is a notable hill located 8.3 km north of Grantham.
Normanton Hill, a hill situated 11.8 km north-north-east of Grantham, offers elevated views.
Newark Island lies 22.1 km north-west of Grantham, and Brown's Island is 28.9 km south of the town. Rushcliffe Country Park is located 34.1 km west.
There have been 101 verified aurora sightings reported within 300 km of Grantham between January 2015 and December 2016.
The record span for aurora viability in this region is from April 2, 2016, to March 30, 2026.
Notable qualifying nights 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 · 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 Grantham 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 Grantham.