Northern Lights in Tromso
Norway (Scandinavia)
Aurora needs a dark sky, enough geomagnetic activity and clear weather. This page covers all three for Tromso, Norway, month by month.
Best Time to Go
Any clear, dark night
Tonight, Live
Live Aurora Maps
Aurora Oval Right Now
Tonight's Viewline
Dark enough from September to March. Too light to see aurora from April to August.
At this latitude the auroral oval is usually overhead or close by on dark nights, even when activity is low, so we do not give a count here. It is not a promise of a display, and clear, dark skies are needed.
Best time of night: the aurora here is usually strongest around 11:30pm standard time (12:30am while clocks are on summer time), from about 9:30pm to 1:30am standard time.
The activity counts here cover geomagnetic activity and darkness only, not clouds. Clear, dark skies are needed to see aurora.
How to Read This Page
Three things have to line up to see the northern lights: darkness, enough geomagnetic activity for the latitude, and a clear sky.
Dark hours are the hours each night with the sun more than 12 degrees below the horizon, read on the 15th of the month.
Activity is the Kp index, a 0 to 9 scale of geomagnetic activity measured every 3 hours. Each place needs a certain Kp for a faint glow to the north and a higher Kp for a display overhead. The counts show how often dark nights reached that level from 1991 to 2025.
The best months are the three months when the largest share of dark nights reached the level. They often fall around the equinoxes, in March and in September and October, rather than in midwinter: geomagnetic storms are more common then, because the tilt of the Earth's magnetic field around the equinoxes makes it easier for the Sun's magnetic field, carried by the solar wind, to connect with it.
The activity counts do not include clouds, and history is not a forecast. Check the live maps on the night, before you head out.
Hours of Darkness Each Month
Mostly Clear Nights and Cold by Month
| Month | Mostly clear nights in a typical month | Average low | Average snow depth |
|---|---|---|---|
| January | about 7 nights | 13°F-11°C | 16 in41 cm |
| February | about 5 nights | 14°F-10°C | 21 in54 cm |
| March | about 3 nights | 17°F-8°C | 25 in64 cm |
| April | about 1 night | 24°F-5°C | 20 in51 cm |
| May | too light | 33°F1°C | 4 in11 cm |
| June | too light | 42°F5°C | under 1 in1 cm |
| July | too light | 48°F9°C | nonenone |
| August | no nights | 46°F8°C | nonenone |
| September | about 6 nights | 40°F5°C | under 1 in1 cm |
| October | about 5 nights | 30°F-1°C | 4 in11 cm |
| November | about 5 nights | 22°F-6°C | 8 in19 cm |
| December | about 5 nights | 17°F-9°C | 12 in30 cm |
A mostly clear night here has at least 2 dark hours with under 50 percent cloud cover (a satellite estimate for the area), counted from 2001 to 2025.
Mostly clear nights and active nights are counted separately, so they are not always the same nights.
Cloud, low and snow figures are satellite and model estimates for the area around each place, 2001 to 2025, not readings from a local weather station. They are averages, not a forecast.
Biggest Nights on Record Here
- November 11, 2025: Kp 9
- October 10, 2024: Kp 9
- November 9, 2004: Kp 9
- November 7, 2004: Kp 9
- October 30, 2003: Kp 9
The strongest dark nights here from 1991 to 2025, each strong enough for a display overhead at Tromso. Clear, dark skies needed.
Moon Guide
Moonlight washes out a faint aurora. The darkest skies come in the week around each new moon:
The Solar Cycle
In October 2024 NASA and NOAA announced that the Sun had reached the maximum period of Solar Cycle 25, which they said could last about a year. Source: NASA
Month by Month in Tromso
| Month | Dark hours |
|---|---|
| January | 15.1 |
| February | 11.8 |
| March | 7.9 |
| April | none |
| May | none |
| June | none |
| July | none |
| August | none |
| September | 5.8 |
| October | 10.6 |
| November | 14.2 |
| December | 16.1 |
When Is the Best Time to See the Northern Lights in Tromso?
The oval is usually overhead or close by on dark nights. Dark enough from September to March. Too light to see aurora from April to August.
Also in Scandinavia
Dark hours: time with the sun more than 12 degrees below the horizon on the night of the 15th. Kp needed: from the place's corrected geomagnetic latitude (AACGM-v2) and NOAA's average position of the auroral oval; the horizon figure adds our own allowance of about 3 degrees. Nights: definitive Kp, 1991 to 2025, counting only nights with darkness.
Kp index data: Geomagnetic Observatory Niemegk, GFZ Helmholtz Centre for Geosciences, CC BY 4.0. Matzka, J., Stolle, C., Yamazaki, Y., Bronkalla, O. and Morschhauser, A., 2021. The geomagnetic Kp index and derived indices of geomagnetic activity. Space Weather, https://doi.org/10.1029/2020SW002641 CC BY 4.0
The month figures are history, not a forecast.
Cloud, temperature and snow data: NASA Langley Research Center (LaRC) POWER Project, funded through the NASA Earth Science/Applied Science Program. NASA POWER