Canonical URL: https://www.iceland.org/northern-lights/forecast

Content updated: 2026-09-10

This is the Markdown representation of the page. Interactive tools and forms are available on the [HTML page](<https://www.iceland.org/northern-lights/forecast>). Source-check and review dates retain the meanings stated in the article.

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# How to Read Iceland’s Aurora Forecast

Start with the sky you can see, then check aurora activity. A promising number is only part of the decision.

Updated September 10, 2026 · [Published by Iceland.org](<https://www.iceland.org/about-us>) · [Writing & review](<https://www.iceland.org/editorial-policy#credits>)

This is an interpretation guide, not a live conditions display. Open the [Icelandic Met Office aurora forecast](<https://en.vedur.is/weather/forecasts/aurora>) for the current map. On that map, **white means clear sky and green means cloud**. Other forecasting products may use different colors.

## Read the map in three steps

1. **Select the date and time.** Use the map controls to inspect the period you are considering, rather than assuming the first image represents your evening.
2. **Check the cloud layer.** The Met Office offers low, middle, high and composite cloud views. Its main aurora display pairs cloud forecasts with a 0–9 activity forecast for midnight on the selected date.
3. **Check darkness.** The sunrise, sunset and darkness times displayed on that page refer to Reykjavík. Do not treat them as precise local times everywhere in Iceland.

Map legend and controls checked against the [Met Office's explanation](<https://en.vedur.is/weather/forecasts/aurora>) (source checked 2026-09-09).

## What the activity forecast can tell you

Kp describes planetary geomagnetic disturbance. It is not a measurement of what a traveler will see from a particular car park. NOAA explains its role in the [geomagnetic storm scale](<https://www.spaceweather.gov/phenomena/geomagnetic-storms>).

For a short-term view, [NOAA’s aurora forecast](<https://www.spaceweather.gov/products/aurora-30-minute-forecast>) models the location and intensity of the aurora, usually with a 30–90 minute lead time. Its colored oval represents aurora, not Icelandic cloud cover. NOAA notes that the lead time can disappear when the model uses a fallback input because solar-wind data are unavailable.

Keep the products separate: use the cloud forecast to assess the sky and the aurora forecast for activity. Neither is a promise of a display from your chosen location.

## Check what “tonight” means on another forecast

NOAA’s [Tonight and Tomorrow Night product](<https://www.spaceweather.gov/products/aurora-viewline-tonight-and-tomorrow-night-experimental>) describes a North American forecast window from 6 p.m. to 6 a.m. US Central Time. That label does not mean the evening at your location in Iceland. Its product history also records that the viewline was removed in May 2026, so older screenshots can show a feature the current version no longer includes.

For the next few days, NOAA’s [plain-language three-day forecast](<https://www.spaceweather.gov/products/3-day-forecast>) is issued at 00:30 and 12:30 UTC. Check the issue time and the period being forecast before comparing it with the Met Office map. A newly opened tab can still contain an older forecast.

## Turn the forecast into a workable evening

Choose a viewing spot you can reach and leave comfortably. Before changing your route, check [road conditions](<https://umferdin.is/en>) and [travel alerts](<https://safetravel.is/>). A clear patch on a map is not a reason to ignore a closure or drive farther than you can manage.

Make the fallback decision before you leave: how late you want to stay out, when you will return, and what you will do if the sky stays covered. If the source says data are unavailable, treat that as missing information, not zero activity or a clear sky.

For the other parts of planning, see [when to look for the northern lights](<https://www.iceland.org/northern-lights/when-to-see>), [viewing locations](<https://www.iceland.org/northern-lights/best-locations>) and [photography advice](<https://www.iceland.org/northern-lights/photography>). If you prefer an organized outing, [compare northern-lights tour options](<https://www.iceland.org/tours/northern-lights>) and check the operator’s weather and retry terms.

Correction, September 9, 2026: an earlier version reversed the Met Office map’s cloud colors. The legend and related instructions have been corrected. Unsupported fixed Kp viewing thresholds and forecast-reliability claims have also been removed.

Planning help

## Forecast questions

Quick answers with safety notes where it matters.

**Which color means clear sky on the Icelandic Met Office map?**

White indicates clear sky; green indicates cloud. Check the selected forecast time and cloud layer before using the map.

**Does a higher activity number guarantee a sighting?**

No. An activity forecast does not establish the cloud cover, darkness or view from your chosen spot. Read those conditions separately.

**Does Iceland.org show tonight's live aurora forecast?**

No. This page explains how to interpret forecasts. Open the official forecast linked above for current data and check its timestamp.

**Correction in this revision:** The cloud-map explanation now follows the Icelandic Met Office legend: white means clear sky and green means cloud. The earlier description reversed those colors.

[Aurora forecast for Iceland: map legend](<https://en.vedur.is/weather/forecasts/aurora>) (source checked 2026-09-09)

For monthly temperature and rainfall averages, explore the climate data in our [Iceland statistics](<https://www.iceland.org/statistics>).