Aurora Forecast Iceland 2026: How to Read vedur.is & Kp

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Most visitors open a Kp chart, see a 2, and give up. That is the wrong way round in Iceland. The country sits under the auroral oval, so modest activity is usually enough. What stops you seeing it is cloud, and the cloud forecast is free, official and updated every day.

This guide walks through the Icelandic Met Office page that guides use, what the numbers on it mean, how NOAA's space weather forecasts fit in, and which apps are worth installing.

The quick answer

The best aurora forecast for Iceland is the Icelandic Met Office page at en.vedur.is. Its map shows cloud (green) and clear sky (white) for the next six days, and a box gives the aurora activity for midnight on a 0 to 9 scale. If the area you can reach is white and the activity is 2 or more, go. For the next hour, add NOAA's 30-minute aurora map. Check in the afternoon, when the tour operators decide.

What is the best aurora forecast for Iceland?

The Icelandic Met Office (Veðurstofa Íslands) aurora page at en.vedur.is. It combines a cloud map of Iceland with an activity forecast, sunset, darkness and moonrise for Reykjavík.

The vedur.is aurora forecast is what Icelandic guides check before they decide where to drive. The map covers six days, in steps of 00, 06, 12 and 18 hours, with a slider to move through them. You can switch cloud layers: low and mid-level, low only, middle, high, or a composite. In the top right corner is the aurora activity for midnight, on a scale from 0 to 9.

Below the map are the sun and moon times for Reykjavík. The Met Office sums it up in one line: the aurora "requires dark and partly clear skies". Iceland keeps UTC all year, so the map times are local times.

How do you read the vedur.is cloud map?

Green is cloud and white is clear sky. Find white near Reykjavík, or within an hour's drive, for the hours after dark. The darker the green, the thicker the cloud.

Read it in this order:

What you see	What it means	What to do
White over Reykjavík at 00:00	Clear sky in town at midnight	Walk to Grótta or the waterfront, or book a tour
Green in town, white inland (Þingvellir, Hvalfjörður)	Clear sky within an hour's drive	A tour is worth it; a car or a minibus can get there
Green almost everywhere in the southwest	Overcast	Expect the tour to be cancelled; plan Perlan or a lagoon
Patchy green and white, moving fast	Broken cloud with wind	Small vehicles do best; gaps open and close
High clouds only	Thin cloud you may see through	Switch to the low and mid-level layer for a truer picture

Look at the 18:00 and 00:00 steps, since those bracket most tour nights. Clouds move fast off the Atlantic, so the map you read at noon can be wrong by 22:00. That is why guides keep checking on the road, and why a small vehicle that can turn round has the edge.

Northern lights over a dark bay with Mount Esja behind and a clear starry sky — White on the map means a sky like this. Green means you are looking at the underside of a cloud.

What Kp do you need to see the northern lights in Reykjavík?

Not much. Kp 2 to 3 is often enough in Iceland because the auroral oval sits over the country. Visit Reykjavík calls Kp 3 or more a good sign, and the Met Office says even its grade 2 can be beautiful.

Kp is a planetary index of geomagnetic disturbance from 0 to 9, worked out every three hours from magnetometers at 13 mid-latitude observatories, according to NOAA's Space Weather Prediction Center. Kp 5 and up counts as a storm on NOAA's G scale:

Kp	NOAA scale	What it means in Reykjavík
0 to 2	Quiet	Faint arcs, often to the north; fine on a dark, clear night
3 to 4	Unsettled to active	Good odds; the lights can move overhead
5	G1 minor storm	Bright, moving displays; visible from town
6 to 7	G2 to G3	Strong; colour and coronas possible
8 to 9	G4 to G5	Rare, severe storms; the whole sky can light up

The vedur.is activity number is not the same as Kp, but it runs on a similar 0 to 9 scale. The Met Office's own notes say "Even grade 2 (low activity) can be beautiful, and grade 3 (moderate) can be dazzling." Aurora Reykjavík's forecast primer explains why: Iceland sits right at the edge of the oval, so small shifts in the oval change a lot.

Green and purple northern lights spreading from a point directly overhead — On a Kp 5 night the lights can reach straight overhead in Reykjavík.

What is the best aurora app for Iceland?

Use the vedur.is site for clouds and add one alert app. Hello Aurora is free and shows other people's live sightings; My Aurora Forecast and NOAA's 30-minute map cover activity.

vedur.is (website): the official cloud map and activity forecast. Bookmark the aurora page on your phone's home screen.
Hello Aurora: free, ad-free, with paid Pro features. Its strength is crowd-sourced sightings, with more than 110,000 reported since 2020, plus storm and substorm alerts and a cloud layer.
My Aurora Forecast: a long-running app with Kp, maps and push alerts. Good for a quick glance.
NOAA 30-minute aurora forecast: a map of the oval, with a lead time of 30 to 90 minutes, built from solar wind measured about 1.6 million km upstream of Earth.

One cloud source and one alert are plenty. More apps means more contradicting numbers, and the cloud map decides most nights anyway.

Can you see the northern lights in Reykjavík today?

Check four things after lunch: the vedur.is cloud map for 18:00 and 00:00, the activity number, the moon, and whether your tour operator is running tonight.

Cloud: on vedur.is, is Reykjavík or the area an hour out white tonight?
Activity: 2 or more on the vedur.is scale, or Kp 3 or more, is a go.
Darkness and moon: the page lists darkness and moonrise for Reykjavík. A full moon washes out faint displays.
Tour status: operators decide in the afternoon. BusTravel posts a banner around 4 PM, Arctic Adventures decides by 18:15, Aurora Experts emails by 18:30, and Gray Line tells you the day before.

If all four line up, go out. If only the clouds look good, go anyway: the activity forecast for midnight is often wrong in both directions. If the tour is cancelled for weather, you rebook or get a full refund.

Travellers with hot drinks next to a minibus on a lava field under northern lights — When the map and the number line up, the guides are already loading the van.

A go night? A small 4x4 group can chase the white patches on the map, with a free retry for two years.

Check dates for the 4x4 aurora tour

Can you show me a map of the northern lights in Iceland?

Two maps tell you most of it: NOAA's 30-minute aurora map shows where the oval is right now, and the vedur.is map shows where the sky is clear over Iceland.

NOAA's 30-minute forecast draws the aurora as a green oval around the magnetic pole, turning red where it is forecast to be more intense. When the oval covers Iceland, the lights are above you. When it sits up over Greenland, you need a stronger night or a clear northern horizon.

Overlay that in your head with the vedur.is cloud map, and you have the same picture a guide works from. The rest is driving. A good guide uses both, plus live readings from magnetometers and the solar wind, and moves the group as clouds shift.

How accurate is the aurora forecast?

The cloud forecast is reliable for the next few hours, less so for the next day. The activity forecast is rough: the useful warning is 30 to 90 minutes, the time the solar wind takes to reach Earth.

Kp is a three-hour average, so a sudden burst can come and go inside a single reading. NOAA's 30-minute map can only see as far ahead as the solar wind monitor allows; when that data is missing, it falls back to Kp with no lead time. The vedur.is activity number is a forecast for midnight, days ahead, and should be read as a hint.

Our view: trust the clouds, treat the activity number as a bonus, and go out when it's clear. A guest on the super jeep tour described what good guides do on the night: "He kept checking the forecast and finding the coolest places to await them".

A super jeep on a snowy track under green northern lights — The forecast gets you out of the door. On the night, the guide keeps reading it.

Should you book a northern lights tour when the forecast is low?

Yes, if the cloud map looks good. Low activity in Iceland still produces visible aurora, and if the tour runs and you see nothing, you get a free retry.

Operators cancel when the odds are poor, so a tour that runs has already passed one check. Booking ahead and cancelling free up to 24 hours before is the easy way to hold a seat. If you are deciding on the day, keep in mind that popular tours fill in peak weeks.

For the evenings when everything is green, Perlan's planetarium show is the indoor plan. For how the free retries compare, see the guarantee guide, and for the best season, the month guide.

Big tyres for tracks a bus cannot take, cocoa and a wool blanket, and free retries valid for three years.

★ 4.2 · 4 hours · from $205

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Frequently asked questions

What do the colours on the vedur.is aurora map mean?

Green is cloud and white is clear sky. The darker the green, the thicker the cloud. The aurora activity is the number in the top right corner, from 0 to 9.

How far ahead does the Iceland aurora forecast go?

The vedur.is cloud map covers six days in six-hour steps. NOAA's 30-minute aurora map looks 30 to 90 minutes ahead. Both are most useful on the day.

What does Kp 3 mean for Reykjavík?

A good sign. Visit Reykjavík calls Kp 3 or more usually a good sign, and in Iceland even lower activity can give a display if the sky is clear and dark.

Is there an official Icelandic aurora app?

The Icelandic Met Office publishes its aurora forecast on en.vedur.is, which works well in a phone browser. Third-party apps such as Hello Aurora and My Aurora Forecast add alerts.

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