Guide · Timing

Best time to see the northern lights in Finland, month by month

Finland's aurora months run from late August to early April, and they are far from equal. Here is how darkness, cold, cloud and the equinoxes change your odds in Saariselkä, month by month.

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Editorial team, saariselkanorthernlights.comUpdated October 19, 2026Reading time about 8 minutes21 sources

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The short version

01Season: Visit Finland gives the aurora season as late August to early April, busiest around the equinoxes.¹
02Top weeks: FMI rates March and early April highest once the weather is counted in.²
03Darkest month: Saariselkä gets no sun at all in mid-December, by the long-term record.³
04Best hours: Displays cluster around midnight, a couple of hours either side.⁴
05Main risk: Cloud cover is the most common reason people miss the lights altogether.⁵

What shapes the aurora year in Saariselkä

Finland's northern lights season is set by darkness before anything else. In summer the problem is the light, not the aurora: in Lapland the sun does not set at all around midsummer, and the nights are generally too light for seeing the lights.⁶ Once real darkness returns, the question becomes how many clear, dark hours you get, and how lively the sky is during them. Darkness, cloud and activity run through every month on this page.

Visit Finland puts the window between late August and early April, when nights are dark enough for the lights to show.¹ Lapland North, the regional tourism board for Inari and Saariselkä, gives September to April instead.⁷ The gap between them is the ragged edge of the season. Mid-August still gives Saariselkä 17.8 hours of sun a day, which leaves only a short stretch of night to work with.³

Activity is uneven too. Visit Finland calls autumn and spring the most active periods, especially around the equinoxes.¹ FMI explains that around the spring and autumn equinoxes the Earth sits in a position that lets solar wind energy pass into the magnetosphere more easily, and that magnetic storms therefore occur more often in autumn and spring than in summer and winter.⁸ The shoulders of the season carry an edge that the deep winter lacks.

Through the season

From the first dark nights to the last

Late August

The season opens

Visit Finland marks late August as the start of nights dark enough for the lights.¹
September

Equinox activity

FMI notes more magnetic storms in autumn and spring than in summer and winter.⁸
November

Short days

Only 5 hours of sun at mid-month in Saariselkä.³
December

Polar night

No sunrise at mid-month in the long-term record.³
March

FMI's pick

Less cloud on average, which makes March a recommended month.⁹
Early April

The window closes

Visit Finland ends the aurora season in early April.¹

September and October: the dark evenings return

September brings the first proper dark evenings of the year. Saariselkä gets 13.4 hours of sun at mid-month and 10.6 hours without it, and average lows stay just above freezing at 2.5 °C.³ For anyone who dislikes deep cold, this is the gentlest way into the aurora months. An evening outside asks for a warm jacket, a hat rather than a full set of Arctic layers, and the fells still glow with autumn color by day.

October darkens quickly. By the middle of the month the sun is up for 9.5 hours, and average lows slip below zero to -3.6 °C.³ The long-term record also counts 7 days a month that bring 2.5 mm or more of rain or snow in October, as many as in September.³ Precipitation days are not the same thing as cloudy nights, but they give a feel for how unsettled a month tends to be, and autumn is rarely the calmest part of the year in the fells.

Autumn's other gift is activity. Around the autumn equinox, the favorable geometry that FMI describes is in place, and a clear night in late September or October can deliver lively displays.⁸ The catch is the weather. If you choose autumn, plan more than one evening, keep your days loose, and decide on the night itself rather than weeks ahead. A clear gap between weather fronts is often all you need.

Darkness and precipitation

How dark and how wet each month is in Saariselkä

Hours without sunDays with precipitationSeason

For each month at Saariselkä: hours the sun spends below the horizon at mid-month, and days bringing 2.5 mm of precipitation or more, NOAA 1991 to 2020.³

Month by month

Daylight, cold and aurora months at a glance

Month	Daylight (h)	Darkness (h)	High / low	Wet days	Aurora
Jan	2.6	21.4	-8 / -16 °C	5	Yes
Feb	7.6	16.4	-8 / -15 °C	4	Yes
Mar	11.5	12.5	-3 / -12 °C	4	Yes
Apr	15.7	8.3	2 / -6 °C	5	Early April
May	20.5	3.5	8 / 0 °C	6	No
Jun	24	0	15 / 5 °C	7	No
Jul	24	0	18 / 9 °C	9	No
Aug	17.8	6.2	15 / 7 °C	7	Late August
Sep	13.4	10.6	9 / 3 °C	7	Yes
Oct	9.5	14.5	2 / -4 °C	7	Yes
Nov	5	19	-4 / -9 °C	5	Yes
Dec	0	24	-6 / -13 °C	5	Yes

Saariselkä station normals, 1991 to 2020: hours of daylight at mid-month, average daily highs and lows, and days that bring 2.5 mm or more of precipitation.³ Season according to Visit Finland.¹

Three windows

Autumn, polar night or late winter

Milder nights

Autumn

September and October

Sun, mid-September: 13.4 hrs
Average low, October: -3.6 °C
Activity: Equinox peak

Check dates

Most darkness

Polar night

December and January

Sun, mid-December: 0 hrs
Average low, January: -15.6 °C
Daytime: Twilight hours

Check dates

FMI's pick

Late winter

March and early April

Sun, mid-March: 11.5 hrs
Average low, March: -11.7 °C
Clouds: Fewer on average

Check dates

Decision helper

Match the month to the trip you want

Find the row that fits your own aurora week

The best odds of a clear sky Milder air while you wait The most hours of darkness Strong activity Deep winter and long nights

March or early April

FMI names these weeks the best in Northern Finland once weather is counted in.²

September or October

Average lows in Saariselkä are 2.5 °C in September and -3.6 °C in October.³

December

Mid-December in Saariselkä brings no hours of sun at all.³

Close to an equinox

FMI says magnetic storms come more often in autumn and spring.⁸

January or February

Average lows sit at -15.6 °C and -15.3 °C: dress for real cold.³

Considering also the weather, the best time for seeing auroras in Northern Finland is in March and early April.

Finnish Meteorological InstituteSource 2

November to January: the long nights

November is the month the light drains away. Mid-month brings just 5 hours of sun, and average lows fall to -9.5 °C.³ Evenings turn dark in the late afternoon, which stretches the time you can usefully spend outside. Every hour of darkness is an hour in which an aurora could appear, provided the sky stays open. Use those evenings well: the darkness is generous, even if the cold has teeth.

Then comes the polar night. The regional tourism board says December and January bring the polar night to Northern Lapland, and the long-term data for Saariselkä shows the sun above the horizon for 0 hours at mid-December.¹⁰ ³ Seeing the northern lights in Lapland, Finland in December means darkness is never your limit. It is not total blackness either: Kakslauttanen, just south of the village, describes light from 10 in the morning to 15 in the afternoon during this period.¹¹

January keeps the deep cold. Average highs sit at -8.3 °C and lows at -15.6 °C, with the sun back above the horizon for 2.6 hours a day by mid-month.³ Visit Finland gives -14 °C as the average winter temperature in Finnish Lapland, with occasional dips to -30 °C.¹² A night out in these months is about clothing as much as timing. A tour that lends warm clothing makes long waits by a frozen lake far easier.

Checklist

Before you fix your dates

Choosing the dates

Aim between late August and early April
Plan evenings that run past midnight
Skip early summer: the nights stay light
Book more than one evening

On the night

Dress for lows well below zero
Give your eyes half an hour in the dark
Find an open view to the north
Check the clouds before you leave

Video

The Best Time to Visit Finland: Monthly Guide

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February to early April: the weeks FMI prefers

Light returns fast after the polar night. February already gives 7.6 hours of sun at mid-month and March 11.5 hours, while lows stay firmly cold at -15.3 °C and -11.7 °C.³ Nights are shorter than in December, but the darkness around midnight is still deep, and midnight is when FMI says displays are typical.⁴ You trade a few hours of night for bright, snowy days out on the open fells.

FMI gives a clear reason to look at spring. Taking the weather into account, it names March and early April as the best time for seeing auroras in Northern Finland.² Its Finnish-language guide adds that spring is on average a less cloudy time, which makes March a recommended month for waiting for the lights.⁹ Put that next to the higher activity around the spring equinox, and the case for March becomes hard to ignore.⁸

The season closes in early April. Visit Finland ends its window there, and by mid-April Saariselkä has 15.7 hours of sun a day.¹ ³ If you want the last of the dark with milder days and long ski afternoons, the first days of April can still work. Later than that, the nights grow too short, and the sky above the fells stays pale even in the middle of the night.

Which hours of the night to be outside

Within any month, the clock matters as much as the calendar. FMI gives midnight, and a couple of hours before and after, as the typical time for auroral displays.⁴ Visit Finland widens that to between 9pm and 2am, and NOAA to between 10 PM and 2 AM local time.¹³ ¹⁴ The overlap, from late evening into the small hours, is the stretch worth protecting from long dinners, saunas and early nights.

Your eyes need time too. FMI's Finnish guide advises staying in the dark for about half an hour before judging the sky, since human night vision is not very good.¹⁵ Step away from headlights and phone screens, and find an unrestricted view at least toward the northern horizon.¹⁶ A faint grey band that your camera turns green is often the first sign, and it can grow into color while you are still deciding whether it is a cloud.

An aurora hunt fits neatly into these hours. The tour booked on this site runs for 3 hours from Saariselkä, with pickup in the Saariselkä area. Check the starting times when you book, and pick an evening that keeps you out close to midnight. If you prefer to go alone, walk out of the village lights and give the sky the same patience a guide would. Bring warm clothing, a hat and gloves, as the listing asks.

Clouds and the solar cycle

No month removes the weather. Visit Finland calls clouds the most common reason people miss the Northern Lights entirely, and FMI notes that the lights cannot be seen from the ground through dense cloud cover.⁵ ¹⁷ The practical answer is a mix: the right months, several evenings, and a way to move toward clearer sky when the local forecast allows it. A guide who knows the local roads can make that move for you.

Activity on the sun shifts the odds over years rather than weeks. FMI ties aurora frequency to the 11-year sunspot cycle, with large displays tending to follow the sunspot count with a lag of a couple of years.¹⁸ Treat the cycle as background rather than a reason to pick a date. On Oct 15, 2024, NASA and NOAA announced that the Sun had reached its solar maximum period, which could continue for the next year.¹⁹

For Lapland the cycle matters less than you might fear. FMI says the solar cycle effect is most pronounced in Southern Finland, and that in Lapland auroras are quite common always, even during solar minimum.²⁰ In Saariselkä, the calendar and the cloud forecast deserve more of your attention than the sunspot count. Choose your months well, keep evenings free, and let the weather decide which night becomes the one you remember.

Picking your dates, in practice

If you can choose freely, March and early April suit anyone who wants FMI's preferred weeks, while September and October suit those who would rather stand outside in milder air.² ³ December and January give the most darkness and the deepest cold, and they bring the polar night as a sight of its own.¹⁰ November sits in between, with long evenings and the first real cold of the season.

Whatever the month, give yourself more than one evening. FMI puts the chance of seeing auroras on a dark and cloudless night in Lapland, at resorts such as Saariselkä, at roughly 50% of nights.²¹ Spread over several evenings, that share works in your favor, and a single cloudy night stops being the end of the story. Put the hunt early in your stay, so that a clouded-out evening still leaves room for another try.

Finally, book in a way that keeps your options open. Cancelling the tour booked here is free right up to 24 hours before it begins, and nothing is charged at booking. That lets you hold a date while you watch the long-range weather. On the day itself, check the cloud and activity readings on our forecast page before you head out, and dress for a night that may run well past midnight.

Plan your night