Aurora Borealis in Sligo
Ireland · 54.27°, -8.47° · geomagnetic 57.4° · needs Kp 7
Tonight's aurora forecast for Sligo
39%
Peak chance of a visible display tonight, from the same model the Revon app runs. Sligo 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 Sligo
Sligo is located at 57.4° geomagnetic latitude. Auroras are typically visible at this latitude when the Kp index reaches 7.
On average, there are about 2.6 nights per year in Sligo where conditions are suitable for aurora viewing.
The historical record for aurora sightings in this region spans from April 2, 2016, to March 30, 2026.
The best months for aurora viewing in Sligo are September, August, and November.
During May, June, and July, there is no full darkness, which can impact aurora visibility.
Sligo has a Bortle rating of 4, indicating a dark sky location.
Areas with Bortle 4 conditions are found 3 km south-west near County Sligo.
The horizon is characterized by features such as Gibraltar Point, Colgagh Lough, Conaghra Point, Doonweelin Lough, and Oyster Island.
Geographic features near Sligo include Gibraltar Point, a headland located 3.1 km west-north-west.
Colgagh Lough, a lake, is situated 4.6 km east of Sligo.
Conaghra Point, a headland, is 5.6 km north-north-west of Sligo, while Doonweelin Lough, a lake, is 7.0 km north-west. Oyster Island, an island, lies 7.3 km west-north-west.
There are 70 verified aurora reports within 300 km of Sligo, recorded between January 1, 2015, and December 31, 2016.
The historical data indicates approximately 2.6 viable aurora nights per year.
Notable qualifying nights in the historical record 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 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 Sligo 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 Sligo.