How to Read an Aurora Forecast
An aurora forecast is easier to read when you know what matters most: geomagnetic activity, darkness, cloud cover, and your location. Here is how to turn the numbers into a better yes-or-no decision.
Lerwick can see the northern lights during active periods, especially when a clear dark sky and lower local light pollution line up with the forecast.
Worth watching
Conditions are promising enough to monitor, especially from a dark place with an open view. Timing and cloud cover can decide the outcome.
Practical viewing window: 7:56 PM–6:05 AM local time
Tonight
Sep 20
Tomorrow
Sep 21
Tuesday
Sep 22
Early outlook — more hours will be added
Local viewing guide
At roughly 60.2° north in Shetland Islands, Lerwick sits at a useful northern latitude where the aurora can appear during active periods. It is less dependable than in the far north, so a promising forecast should still be treated as an opportunity rather than a guarantee. Lerwick’s Shetland setting is among the United Kingdom’s most northerly, making it one of the country’s stronger aurora locations.
Lerwick has limited large-city glow, but nearby lamps and buildings can still reduce night vision. A safe open area outside the brightest part of the settlement will give both your eyes and a camera a cleaner view of the sky.
Autumn through early spring offers the most useful darkness. Summer nights can remain too bright for a faint aurora to stand out, even when space weather is active. Before heading out, compare the aurora forecast with local cloud conditions.
Aurora conditions can change during the night, so keep checking the forecast rather than relying on an earlier reading. From Lerwick, the best plan combines clear weather, an unobstructed northern horizon, patience, and as little artificial light as practical.
The current aurora chance for Lerwick is None. Use the local viewing guide above for Lerwick-specific context, then combine the live rating with darkness and weather.
A none or near-none chance in Lerwick usually means tonight is not a strong aurora setup for this location. It is still useful context, because you can compare later updates or look at cities farther north for better odds.
Use these pages to compare Lerwick with other forecast locations, understand why visibility changes, and plan the next place to watch.
Learn
Read these guides when the Lerwick forecast looks interesting but you still need help judging darkness, season, or viewing conditions.
An aurora forecast is easier to read when you know what matters most: geomagnetic activity, darkness, cloud cover, and your location. Here is how to turn the numbers into a better yes-or-no decision.
Aurora forecasts can be useful, but they are never perfect. Solar activity, magnetic-field direction, cloud cover, and local darkness all make the northern lights harder to predict than most people expect.
The KP index is one of the most common numbers in aurora forecasts, but it works best as a rough guide, not a promise. Here is what it means and how casual northern lights watchers should use it.