Switzerland in Summer 2027: Best Things to Do, Weather & When to Book

If you picture Switzerland, you probably picture it in summer: green meadows with cowbells, turquoise lakes, snow on the peaks and red trains winding through it all. From mid-June to mid-September, every high trail, pass road and cable car is open, the lakes are warm enough to swim, and evenings stay light until nearly 9:30 p.m.

The catch: everyone else knows this too. Here's how to do Swiss summer well, and why the planning starts in January.

Summer at a glance

When to book (sooner than you think)

The biggest mistake is booking a Swiss summer in the spring. Mountain villages are small, and the best rooms go early:

• January to March: book hotels for July and August, especially in Zermatt, the Jungfrau villages (Grindelwald, Wengen, Mürren, Lauterbrunnen) and the Engadine.
• 3 months ahead: reserve panoramic train seats like the Glacier Express.
• A few days ahead: rail passes and mountain tickets, once you see the weather.

Best things to do in summer

Hike above the tree line

Summer is the only season when the high trails are fully open, usually from late June or early July once the snow melts. Classic routes include the Bachalpsee lake above Grindelwald, the Five Lakes Walk in Zermatt, the Oeschinensee and the Stoos Ridge. See our list of the best hikes in Switzerland.

Swim in the lakes and rivers

Swiss cities live on the water in summer. Zurich has historic lake and river baths, Geneva has the Bains des Pâquis on the lake, and in Basel and Bern people float down the river with waterproof bags. In the mountains, try a quick dip in a forest lake like the Caumasee near Flims.

Drive the high passes

From June to October, the great pass roads reopen: the Furka, Grimsel, Susten and Gotthard. Do them in a day on our Swiss Alps road trip, or loop the whole country on the Grand Tour of Switzerland.

Ride the scenic trains

The Glacier Express, the Bernina Express and the GoldenPass Express all run in summer, and the mountain railways to Jungfraujoch, Gornergrat and Rigi are at their best on long, clear days.

Catch a festival

• Montreux Jazz Festival: July 2–17, 2027, on the shore of Lake Geneva.
• Swiss National Day, August 1: bonfires on the hills, fireworks over the lakes, and brunch on farms across the country.
• Locarno Film Festival: open-air screenings on the Piazza Grande, traditionally in August (the festival has discussed moving to July from 2027, so check the dates).
• Alpine cow descents: in September, cows come down from summer pastures decorated with flowers and huge bells.

Soak after the hike

Summer is great for open-air thermal pools at altitude. In Leukerbad, the outdoor pools face the Gemmi cliffs; in Vals, the stone baths stay open year-round. See our thermal baths guide.

Weather and what to pack

Lowland cities usually reach the 70s and low 80s °F (21–28°C), and heat waves are increasingly common. Mountain villages are 10–15°F cooler, and summits can be near freezing even in August. Afternoon thunderstorms are frequent in the Alps, so start hikes early and aim to be down by mid-afternoon.

Pack layers: a warm fleece and a rain jacket for the mountains, sun protection (the sun is strong at altitude), proper hiking shoes and a swimsuit.

Where to base yourself

For a first summer trip, combine a lake town and a mountain village: Lucerne and Grindelwald, or Lake Geneva and Zermatt. Our Switzerland itinerary for 7, 10 or 14 days shows how to link them, and where to stay in Switzerland for hiking compares the mountain bases.

Summer on a budget

Early June and the first half of September give you most of the summer experience at lower prices. Sleep one village down the valley (Wilderswil instead of Grindelwald, Täsch instead of Zermatt), picnic from the supermarket, and check whether a Swiss Travel Pass or a Half Fare Card fits your route. More in Is Switzerland expensive?.