Thousands of lightning strikes hit Switzerland overnight

Nearly 12,000 lightning strikes crossed Switzerland overnight, turning the storm into one of the most lightning active events recorded in the country. MeteoSwiss had counted the strikes by Wednesday morning, September 9, 2026, after thunderstorms moved across several regions.

The scale of the activity placed the day among Switzerland’s most lightning active days on record. It also ranked among the most active September days ever measured, according to MeteoSwiss. The figures capture lightning detected across the country, rather than a single concentrated storm cell.

Powerful winds accompanied the electrical activity. MeteoSwiss recorded gusts of 116 kilometres per hour at Hörnli in canton Zurich, while winds reached 110 kilometres per hour in Steckborn, canton Thurgau, and 101 kilometres per hour in Koppigen, canton Bern.

The storm arrived during the night, when darkness and heavy rain can complicate travel, outdoor work and emergency response. By early Wednesday morning, however, there were no reports of damage. The initial assessment remained subject to change as municipalities, transport operators and emergency services continued checking local conditions.

Hörnli recorded Switzerland’s strongest reported wind gust, at 116 km/h, during the storm. The measurement came from the elevated site in canton Zurich, where exposed terrain can register stronger winds than surrounding lowlands.

MeteoSwiss also measured 110 km/h in Steckborn, on Lake Constance in canton Thurgau. In canton Bern, Koppigen recorded a gust of 101 km/h. Together, the readings show that the storm’s wind field affected locations in northeastern and central Switzerland, rather than remaining confined to one valley or urban area.

Wind speeds above 100 km/h can bring down branches, damage vulnerable structures and disrupt roads or rail lines. The source report gave no indication that those effects had occurred by early Wednesday. It recorded the measurements as part of the weather service’s first assessment of the event.

The regional spread of the readings also reflects Switzerland’s varied geography. Hörnli’s hilltop location, Steckborn’s position near the lake and Koppigen’s inland setting each offer a different view of the storm’s strength. Further reports from cantonal authorities would be needed to establish the full local impact.

MeteoSwiss counted almost 12,000 strikes before Wednesday morning, placing the event among Switzerland’s most electrically active days. Lightning detection networks make it possible to track the distribution and intensity of such storms across the country, including strikes far from major population centres.

The September timing adds to the significance of the measurement. MeteoSwiss described the date as one of the most lightning active September days of all time. The comparison is based on recorded lightning activity and does not mean every part of Switzerland experienced the same conditions.

Switzerland has a long history of strong regional differences in lightning frequency. Appenzell Innerrhoden, for example, has identified the village of Gonten as a national lightning hotspot because it recorded the highest number of strikes per square kilometre in Switzerland in the previous year. That background helps explain why mountainous and foothill areas receive close attention during active storm periods.

The latest event also links a national weather picture to local exposure. A lightning total may rise rapidly across a large storm system, while the effects on communities depend on terrain, buildings, infrastructure and the path of individual cells.

No damage had been reported by early Wednesday morning, despite the combination of nearly 12,000 lightning strikes and wind gusts above 100 km/h. That first assessment offered a cautious pause while local authorities continued to monitor roads, railways, power infrastructure and exposed structures.

Storm reporting often develops in stages. Lightning can trigger isolated fires or outages, while strong gusts may leave damage in wooded areas or on private property that does not immediately reach cantonal authorities. The information available on September 9 identified no confirmed damage, and it did not report injuries or major disruption.

For residents, the storm’s immediate significance lies in its breadth and speed. The readings from Zurich, Thurgau and Bern show how quickly conditions varied across the country. People travelling through affected areas still faced hazards from standing water, fallen branches and further electrical activity, even where the first reports were clear.

MeteoSwiss observations will provide the basis for a fuller account of the storm’s path and intensity. The agency’s lightning totals and wind measurements give Switzerland a national overview, while municipal and cantonal checks determine how the night translated into local consequences.

September 9, 2026, entered the record as one of Switzerland’s most lightning active September days, according to MeteoSwiss. The overnight storm shows how quickly a national weather event can combine intense electrical activity with damaging wind potential across multiple cantons.

The available figures establish the event’s scale without confirming widespread disruption. Nearly 12,000 strikes were recorded, and three measurement sites registered winds between 101 and 116 km/h. At the time of the initial report, authorities had recorded no damage.

The next stage is verification on the ground. Cantonal services, transport operators and local municipalities must identify any delayed effects, particularly in wooded areas, on overhead infrastructure and near exposed buildings. Weather conditions can change quickly, so the absence of early reports does not remove the need for continued caution.

For Switzerland’s weather services, the event will add another significant entry to the country’s lightning record. For residents, the practical picture remains regional: the storm affected the country broadly, while the strongest measured winds and any resulting impacts depended on local terrain and the storm’s precise track.