Interlaken

Here's the thing about Interlaken that catches most people off guard: it rains 1,846mm a year — that's nearly 73 inches — which puts it in the conversation with some genuinely wet European destinations. But don't let that scare you off. The rainfall is scattered across the year in unpredictable bursts rather than concentrated monsoons, and when the sun does break through those Bernese Oberland clouds, the light on the glaciers is almost hallucinogenic. Your best bets are September through early October and April, when you get afternoon highs around 16–18°C (61–64°F), manageable crowds, and the mountain clarity that actually makes the scenery worth the trip.

September and early October feel completely different from spring. The summer tourists have evaporated, locals are back in town, and the light has that golden-hour quality all afternoon — you're getting roughly 8.6 hours of sunshine daily on average, but it feels sharper, less washed out. April brings similar conditions: wildflowers are just starting, the valleys are green again after winter, and you can actually move through the town without shoulder-to-shoulder crowds at every cafe. Both months hit that sweet spot where you're not freezing but you're also not melting while waiting for a cable car.

Now, about those months to avoid — and I say this from experience, not just a spreadsheet. May, June, and August are when Interlaken becomes almost comically overcrowded. May and June aren't even that warm (highs around 17–20°C / 63–68°F), but they're when every school holiday in central Europe aligns, and the town gets genuinely claustrophobic. August is the same energy but hotter and more humid, with prices inflated by 30–40% for accommodations. July is slightly less chaotic than August but still peak season. Winter (November through March) brings serious snow at altitude and frequent grey days, though if you're into skiing or crisp, quiet mountain towns, December and January have their own appeal — just expect highs barely above freezing (2–4°C / 36–39°F).

Looking at 2026 specifically: we're in a period where Alpine weather is becoming slightly more unpredictable — earlier spring melt-offs, occasional late-season snow surprises. That said, September 2026 should follow the historical pattern of being genuinely one of your safest bets for stable weather and manageable conditions. The annual average high of 15.5°C (60°F) tells you Interlaken is never warm in the traditional sense, but that's actually the point — you're there for the mountains and the lakes, not beach weather.