Northern lights in Tromsø in October
68%
of 4-night stays in October saw the northern lights at least once, by our estimate. On any one night the chance was 34%. October is a good month in Tromsø, though January (75%) was better.
How long to stay in October
Chance of at least one good night, by length of stay, Tromsø in October, 2015–2025. 6 nights got you to about 3 in 4.
In a typical October, the longest run of nights without a single clear, dark hour was 8 nights. A stay shorter than that can fall entirely into one cloudy spell.
Week by week in October (4-night stay)
- 30 Sep – 6 Oct66%
- 7 Oct – 13 Oct67%
- 14 Oct – 20 Oct68%
- 21 Oct – 27 Oct72%
- 28 Oct – 3 Nov66%
October in Tromsø, year by year
Good nights in October, each year 2015–2025. The typical October had 10 good nights; the worst, 2021, had 4 and the best, 2025, had 17. 2023–2025, around the solar maximum, averaged 13 against 10 before.
A good night = at least one hour that was dark (sun below −12°), mostly clear (NASA POWER cloud data, calibrated on FMI weather stations) and had a Kp index at or above the Kp 1 that Tromsø needs (GFZ Potsdam). These are estimates, not sightings. How it works
Other destinations in October
Tromsø ranks 13th of 21 popular aurora destinations for October (4-night stays, 2015–2025).
Churchill
90%Yellowknife
86%Alta
79%Kilpisjärvi
79%Abisko
76%Lofoten
74%Aurora tours in Tromsø in October
A guide with a car can drive to wherever the clouds break. With cloudy spells of 8 nights in a typical October, that matters here. Booking for your first night leaves the rest of the stay to try again if it's cloudy.
Tromsø in October: questions
October is a good month in Tromsø, though January (75%) was better. In 2015–2025, 68% of 4-night stays in October saw the northern lights at least once, and an average October had 11 good nights (clear, dark and with auroras strong enough) out of 31. These are estimates from NASA cloud records and the Kp index, not sightings.
2 nights gave 49%, 4 nights gave 68%, 7 nights gave 82% odds of at least one good night in October (2015–2025). For about 3-in-4 odds, plan 6 nights or more. In a typical October, the longest run of nights without a single clear, dark hour was 8 nights. A stay shorter than that can fall entirely into one cloudy spell.
About 10.6 hours a night with the sun more than 12° below the horizon, which is dark enough for faint auroras. Of those, 2.5 hours a night were mostly clear on average, and 12 nights in an average October had at least one clear, dark hour.
Auroras can appear any time it's dark, but activity usually peaks around midnight, roughly 22:00 to 02:00. With about 10.6 hours of darkness a night in October, start looking as soon as it's dark and stay out past midnight if you can. The live forecast shows tonight's best hour.