Berlin, Germany
Tier 3 · needs Kp 7 · Bortle 9. Live answer for Berlin tonight.
Crunching NOAA Kp, cloud cover, moon phase and darkness for Hamburg…
connecting to NOAA SWPC + Open-Meteo…
To see the aurora from Hamburg you need a serious geomagnetic storm: the city is far enough from the oval that ordinary activity never reaches it, and the nights when it does are memorable precisely because they are rare.
Hamburg needs Kp 6, one of the lower mid-latitude thresholds in Europe, because it sits further north than Berlin or Amsterdam. The port and the surrounding flat plain mean the horizon is unobstructed, but the city itself is bright and spread out along the Elbe.
Counted properly, Hamburg gets 280 nights of astronomical darkness a year. They begin around **3 Aug** and end about **9 May**, and inside that window the sky is dark enough that the only things standing between you and a display are cloud and geomagnetic activity. The counter-season is just as clearly defined: from about **10 May** to **2 Aug** (85 nights) the sun never gets 18° below the horizon, so the sky never reaches full darkness, though the sky stays dark enough in the early hours that a bright display is still worth looking for.
On the darkest night of the year the sun sinks to 59.9° below the horizon at Hamburg — deep enough that the sky itself stops being the limiting factor. From roughly 10 May to 2 Aug the nights never reach full astronomical darkness, so the practical season is shorter than the calendar suggests.
The Elbe estuary and the flat country north of the city both give a dark, level horizon over water or fields.
Direction matters as much as darkness. The display will be over the magnetic pole, which from Hamburg means the northern sky — so pick a viewpoint with nothing between you and that horizon, and put any streetlight behind you. Tonight's "best window" figure above is the first hour where cloud falls below about 40% inside this latitude's dark period.
Kp is a planetary number, and the only way to read it usefully is against this city's own threshold. For Hamburg that threshold is Kp 6, set by a magnetic latitude of 53.5°:
| Kp index | What Kp means in Hamburg |
|---|---|
| Kp 0 | Nothing from Hamburg — the oval stays too far north. Worth knowing so that a quiet night reads as expected rather than disappointing. |
| Kp 1 | Nothing from Hamburg — the oval stays too far north. On those nights the forecast at the top of this page will say NO, and that is the honest answer. |
| Kp 2 | No display at this latitude; the activity is confined north of Hamburg. Nothing to plan around — save the trip for a stronger forecast. |
| Kp 3 | No display at this latitude; the activity is confined north of Hamburg. Worth knowing so that a quiet night reads as expected rather than disappointing. |
| Kp 4 | Possible as a low smudge from a dark-sky site — the city's own light will beat it. Check the cloud forecast before committing to the drive. |
| Kp 5 | Faint glow on the northern horizon, and only from genuinely dark ground outside the city. Give your eyes 20 minutes to adapt before deciding it is a no. |
| Kp 6 | Visible low on the northern horizon from Hamburg — active arcs, and movement you can see with the naked eye. Worth clearing an evening for if the cloud cooperates. |
| Kp 7 | Worth clearing your evening for: structure, movement and colour, with rays extending high into the sky. Any genuinely open horizon will do at this level. |
| Kp 8 | Storm-level display — vivid colour, fast movement, and the aurora high overhead. These are the nights people travel for. |
| Kp 9 | Severe storm (G4–G5): the aurora reaches deep into mid-latitudes. From Hamburg, look straight up — it can be everywhere. Rare enough that it is worth cancelling other plans for. |
At Bortle class 9, Hamburg's own light is the biggest single obstacle between the forecast and what you actually see. A Kp 6 night that shows beautifully from open country shows as nothing from a lit street. When the verdict above is GO or MAYBE, budget the drive out of town into the evening.
The score above is built from five weighted factors, each using Hamburg's own figures rather than a regional default: Kp against a local threshold of 6 (35%), cloud cover averaged across the dark hours at 53.55°, 9.99° (25%), moon illumination (15%), this latitude's astronomical darkness window (15%) and Bortle 9 light pollution (10%). The scoring method, its inputs and its failure modes are written up in full on our methodology page. No account, no app, no email address — everything above is computed in your browser from NOAA and Open-Meteo data. Anonymous analytics and Google's advertising script are the only third parties involved, both explained on the privacy page.
For Hamburg the practical figure is Kp 6. Because it comes from magnetic latitude (53.5°), it does not vary with the season or the solar cycle — and it is the exact number the answer at the top of this page is checked against. Anything below it and the oval stays too far northern.
About 280 nights a year qualify: the run from around 3 Aug to around 9 May. The 85-night stretch from 10 May to 2 Aug is the one to avoid, because the sky never gets dark enough at this latitude no matter how strong the storm. On a usable night, look between 21:00 and 01:00 local.
Four of the five inputs are measured, not modelled: NOAA's Kp forecast (good to roughly 12 hours), Open-Meteo cloud for Hamburg's exact coordinates, moon illumination, and the darkness window computed for this latitude. The fifth is Bortle 9 light pollution. Where the forecast is genuinely uncertain — substorm timing at minute scale — the page shows MAYBE rather than a false GO.
280 nights a year reach full astronomical darkness here, with the sun dropping to 59.9° at its lowest. The other nights are the trade-off: around 10 May to 2 Aug, the sun stays too high for a true black sky.
During strong displays, yes, but Hamburg's Bortle 9 light pollution washes out anything except the brightest activity. For a Kp 6 display, driving 20–40 minutes to darker surroundings roughly doubles what you will see.
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