A sharp cold front is expected to cross the Alps on Thursday, 8 October, creating a strong altitude split across central Europe: rain in most valleys, but genuine snowfall on the highest terrain. The most convincing snow signals currently run from the French Alps through Switzerland into the highest parts of Austria, while north-western Italy – especially Monte Rosa – may see the largest high-altitude accumulation.
Where can it really snow?
The standout location is Monte Rosa. At Capanna Margherita, the current forecast adds up to roughly 31 cm of fresh snow through Thursday, with temperatures near -13 to -9 °C. On the French side, Mont Blanc is forecast around -14 to -11 °C with about 10.5 mm of precipitation, supporting roughly 10–20 cm of fresh snow on exposed high terrain. In Switzerland, the northern Alps are favoured, with heavy precipitation around Engelberg and snow increasingly likely above roughly 2500–3000 m.
Germany’s snow is much more restricted: the Zugspitze is the main candidate, with about 15.7 mm of precipitation and temperatures around -6 to +2 °C, enough for roughly 5–10 cm on the summit area. In Austria, the western high Alps and glacier regions are favoured; the snow line in the Kaunertal forecast drops sharply later in the day, while the valley itself remains rain.
Snow line: high at first, lower late
Thursday starts relatively mild in many Alpine valleys. The colder air arrives with the front, so snow levels are expected to fall during the afternoon and evening rather than sit low all day. That timing matters: a few hours of delay can shift a meaningful share of the snowfall into Thursday night or Friday morning.
Valleys mostly stay wet
Annecy is forecast around 9–16 °C, Engelberg around 6–13 °C and Oberstdorf around 7–15 °C. Those values are far too mild for valley snow during most of Thursday. Even where precipitation is heavy, the first phase will generally be rain below roughly 1800–2200 m, with the lowest temporary snow line more likely toward the end of the event.
This is therefore not a broad lowland winter outbreak. It is a high-mountain snowfall event with potentially useful early-season accumulations on glaciers and high ridges. Forecast confidence for the overall cold-front passage is moderate; exact snow totals and the lowest snow line should be updated again on Wednesday.