Best time to see the northern lights in Tralee, Ireland

Updated • 21:02 UTC

Tralee gets the aurora on 1.4 clear nights in a typical year. October is the best month at 0.28 of them, and nights were counted at Kp 6 or higher, which the planetary index last reached on 22 March 2026.

Typical-year figures: a 1996–2026 planetary Kp record crossed with a 2001–2020 cloud normal. They describe a normal year, not tonight — the live Tralee forecast shows the actual cloud, moon and darkness right now. Check tonight's forecast for Tralee →

🌌 Clear nights a year

1.4

Fair — 1.4 clear aurora nights in a typical year Compare with Ireland

🌟 Best Month

October

0.28 clear nights in a typical year

🌙 Peak Hours

23:00-01:00

Magnetic midnight

⚡ Required Kp

Kp 8.0–9.0

Served for the live forecast; nights counted at Kp 6, last reached 22 March 2026

🧭 Auroral oval (model)

Overhead

Model estimate at Kp 6

Month by month in Tralee

Astronomical darkness, the nights on which planetary Kp reached Kp 6 inside that darkness, the local cloud normal, and what the cloud leaves of the count.

Month	Astronomical darkness	Opportunity nights	Mean cloud	Clear opportunity nights	Moon-free
January	11.6h	0.36	76.3%	0.09	56.2%
February	10.22h	0.33	77%	0.08	54.7%
March	8.2h	0.59	73.7%	0.16	54.9%
April	5.51h	0.52	72.3%	0.14	57.4%
May	2.51h on 56.2% of nights	0.23	76.2%	0.05	53%
June	No astronomical darkness	—	77%	—	—
July	1.61h on 24.9% of nights	0.03	79.7%	0.01	60.8%
August	4.46h	0.42	77.2%	0.1	57.5%
September	7.41h	0.68	73.6%	0.18	56.6%
October	9.63h	1.04	72.6%	0.28	57.1%
November	11.26h	0.95	73.7%	0.25	56.3%
December	12h	0.26	76.3%	0.06	55.9%

June never reaches astronomical darkness at Tralee, so no Kp value makes it a viewing month and it is excluded rather than scored.

Opportunity nights are the whole 1996–2026 record. In the current solar cycle alone (since 2023), October has averaged 0.81 rather than 1.04.

October: 9.63h of astronomical darkness a night
October: 1.04 nights reach the Kp threshold inside that darkness
October: 72.6% mean cloud leaves 0.28 of them clear
October: 57.1% of those nights are moon-free

Similar timing: Manchester , Sault Ste. Marie , Kilkenny

Higher-odds destinations: Fairbanks , Yellowknife , Tromsø

How these numbers were made

Evaluated at: Tralee, 52.2713° N 9.6964° W — darkness and cloud are properties of that point, not of a region.
Darkness: Sun at or below 18° under the horizon (astronomical twilight), sampled every 10 minutes across every year of the Kp record and averaged per night of each month rather than on one representative day.
Geomagnetic record: GFZ Potsdam planetary Kp index, 3-hourly, 1996–2026 — 89,662 intervals, licensed CC BY 4.0.
Cloud: NASA POWER 20-year monthly climatology (2001–2020), parameter CLOUD_AMT. A monthly mean, not a forecast.
Moon: A night counts as moon-free below 35% lunar illumination while the moon is up.
Auroral oval: NOAA auroral-oval model, equatorward boundary near magnetic latitude 67 − 2 × Kp. A model estimate shown beside the measured record; it never replaces it.
Clear opportunity nights: Nights on which at least one 3-hour Kp interval falls inside local astronomical darkness and reaches the count threshold, scaled by one minus the monthly mean cloud amount.
Kp threshold: Nights were counted at Kp 6 or higher from the climatology's magnetic-latitude ladder; the Required Kp shown above, Kp 8, is the threshold the live Tralee forecast serves from a corrected magnetic latitude, one step apart.
Dataset version: Version 2026-09-07, computed offline from the closed record — the page is regenerated, not forecast.

Kp record: GFZ Potsdam (CC BY 4.0). Cloud normal: NASA POWER. How the live forecast is built: methodology page.

Frequently Asked Questions

When can you see the northern lights in Tralee?

October is the best month, with 0.28 clear nights in a typical year out of 1.4 across the whole year. Every month except June carries some chance. June never reaches astronomical darkness, so no Kp value makes it a viewing month.

What Kp is needed to see the aurora from Tralee?

Tralee needs Kp 8 or higher for aurora and Kp 9 for a noticeable or bright display. The NOAA auroral-oval model places the oval overhead at Tralee once the planetary index reaches Kp 6. That is a model estimate; the dates on this page come from the measured Kp record instead.

Has the aurora ever been visible from Tralee?

Yes. In the 1996–2026 planetary Kp record the index reached Kp 6, the threshold these nights were counted at for Tralee, most recently on 22 March 2026. The Kp 7 needed for a noticeable display was last reached on 21 March 2026. Whether anyone saw it also depended on the cloud, moonlight and darkness of that night, which the Kp record does not carry.