Aurora Borealis in Letterkenny
Ireland · 54.95°, -7.73° · geomagnetic 57.9° · needs Kp 7
Tonight's aurora forecast for Letterkenny
3%
Peak chance of a visible display tonight, from the same model the Revon app runs. Letterkenny needs Kp 7 to see anything at all, and tonight the forecast peaks at Kp 3.3. Short of the threshold, which is what most nights look like here.
Get the full 30-night forecast in Revon
Updated 2026-08-09 18:23 UTC
Local aurora guide for Letterkenny
Letterkenny is at a geomagnetic latitude of 57.9°, which is favorable for aurora viewing.
An aurora visible here requires a Kp of 7 or higher. This level of geomagnetic activity occurs on average 2.6 nights per year.
These conditions have been recorded between 2016 and 2026.
The darkest months in Letterkenny are May, June, and July.
The best months for aurora viewing are September, August, and November.
Letterkenny has a Bortle scale rating of 4, indicating a dark sky.
Areas with Bortle 4 conditions are found 6 km north near County Donegal.
The horizon is generally clear, with hills, lakes, and a cape noted in the surrounding landscape.
North-east of Letterkenny, Knockbrin is a hill 4.2 km away.
West of Letterkenny, Gregory Hill is a hill 5.6 km away.
Lough Akibbon is a lake 11.1 km west-north-west, and Lough Fern is a lake 12.2 km north. Whale Head is a cape 15.3 km north-east.
There are 172 verified aurora reports within 300 km of Letterkenny between January 2015 and December 2016.
The record span for viable nights is from 2016 to 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 · 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 Letterkenny 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 Letterkenny.