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Engelberg-forum threads on summer visits name July and August the warmest, most popular window, comfortable enough for a swim at the Trubsee or Melchsee lakes without ever feeling oppressive at this elevation. Posters call afternoon storms the main caveat, showers turning up on a real share of summer days, though mornings are generally more settled. The Four Lakes hike, named one of Switzerland's finest panoramic routes, typically opens by mid-June and stays clear into October, mountain transport making it possible to start already fairly high rather than climbing the full elevation on foot. Regulars recommend the cable car and chairlift up to the Jochpass followed by a walk down to the unspoiled Engstlensee as a standout half-day outing. The last week of August is called a genuine sweet spot, crowds thinned once Swiss school holidays end. The record: 21.3C days feeling like 21C, 11.8C nights, an extraordinarily high 174mm across over 16 days and 80 percent humidity.

Forum posters describe March in Lucerne as genuinely unpredictable - sometimes cold and wet, sometimes dry and sunny - with fog no more common here than in Zurich or elsewhere in Switzerland, and no reliable way to predict conditions more than a day or two ahead. Posters cite typical lower-elevation temperatures ranging from 0 to 20C, with sun, fog, rain and even snow all realistic possibilities within the same week. Posters are consistent that by late March, snow is gone from the lake plain but still very present in the mountains, giving visitors a genuine choice: stay around Lucerne and the lake for a springlike feel, or head up to Titlis above Engelberg or Rigi for a proper winter scene. Posters generally recommend checking forecasts close to travel dates rather than planning weather-dependent activities too far in advance.

September is the forum's pick for Lucerne — the August crowds gone, a first crispness in the mountains, and weather at least as good as August as often as not. Days run about 20°C, evenings cooler, with one caveat the record supplies: rain falls on nearly fifteen days. Regulars call September "not especially rainy as a rule" while also warning it can go from fully sunny to fully wet inside a day, which is the more useful half of that. Pack layers, waterproof shoes and a rain jacket for the mountains, plus high-factor sun cream. Snow in Lucerne itself would be very unusual; Titlis has it year-round, being a glacier.