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Engelberg-forum threads on skiing in May describe the upper glacier terrain as genuinely holding real cover year-round, posters calling October through May the broad window when the higher slopes stay operational weather permitting. Regulars call the lower valley a different picture by May, spring underway even while the glacier above keeps real winter terrain running. Posters recommend checking lift and cover status before a May ski day, conditions this late varying considerably by year. Regulars call the Fürenalp area worthwhile regardless of ski plans, real views without needing full glacier access. Posters recommend real layers for the swing between valley and summit, the difference considerably larger than it looks on a map. Regulars call May an interesting shoulder month for anyone wanting spring valley walks and real glacier turns in one trip. The record: 15.1C days feeling like 14C, 5.7C nights, an extraordinarily high 174.4mm across nearly 20 days and 80 percent humidity.

Regulars are blunt this month is genuinely hard to predict year to year - some summers running dry, sunny and warm straight through, others delivering near-continuous rain from June into late August, with no reliable way to know which version a given trip lands on. Our row backs the warm, genuinely wet read, 25.9C reading as a hot 27C, over 15.8C nights, with a substantial 128mm of rain across 10.2 days and humidity at 73 percent, regulars specifically calling the combination of warmth and humidity uncomfortable when it hits. Regulars are consistent that short, heavy downpours in the afternoon or evening are common even during an otherwise pleasant stretch, sun never quite guaranteed for a full day. A packable rain layer stays the standard advice regardless of the forecast. The record: 10.6 hours of sun, an 8.5 kph wind and AQI 54.

September here is the month after the crowds: warm enough by day to reach the twenties, with mornings and evenings that have turned properly cool. Regulars date the end of the swimming season precisely - their last lake swim usually falls between the 17th and the 22nd - which is a better marker than any average. Our row gives 20.9C over 12.3C, and is less flattering than their reputation on rain: 104.7mm across 10.2 days with only 9.1 hours of sun. The autumn colour they recommend planning around belongs to the end of October, not now. The record: humidity 78 percent, an 8.4 kph wind and AQI 50.

The June question is the lake, and the answer is that it is Alpine meltwater, so it can still be chilly and its temperature depends mostly on the previous week's weather rather than on the date. Almost every village along the shore has its own Badi, so the swimming is easy once the water allows it. On land regulars give about 22C as the June average against our 25C, and note the range across recent years has run from 12C to 33C. Heat brings thunderstorms, short ones, and almost always in the late afternoon or evening - which is how to read our 132mm across 11.9 days under 11.7 hours of sun. The record: 14.7C nights, humidity 73 percent and AQI 58.

Forum threads put a normal autumn day at 8-15C, with some warmer late-summer-feeling days but also colder, rainy or foggy ones mixed in - sometimes all three flavors trade off within the same week. Early October can still see highs near 20C, but posters consistently flag anything after about the 20th as "dodgy," with real risk of persistent plateau and valley fog setting in by the 25th. The standard packing advice is a layer, a pullover and a light raincoat; snow in the city itself is not expected this early.