Inferno Triathlon

About the Event

Conquer the ultimate "devilish" mountain run at the Inferno Halbmarathon on August 15, 2026. This formidable race ascends over 2,000 meters from the Lauterbrunnen valley floor to the summit of the Schilthorn, demanding peak fitness and resilience. The Inferno Halbmarathon is a pure alpine challenge for experienced runners, offering an unforgettable journey through the heart of the Berner Oberland with a triumphant, high-altitude finish.

Races Offered

Halbmarathon

Aug 16, 2025

straighten

Distance — 21.1K

terrain

Type — Multisports

timer

41 days remaining

Halbmarathon relay race

Aug 16, 2025

straighten

Distance — 21.1K

terrain

Type — Multisports

timer

41 days remaining

Aug 16, 2025

straighten

Distance — 3.1 km 97 km 30 km 25 km

terrain

Type — Multisports

timer

41 days remaining

Inferno Triathlon Couples

Aug 16, 2025

straighten

Distance — 3.1 km 97 km 30 km 17 km

terrain

Type — Multisports

timer

41 days remaining

Inferno Triathlon Relay

Aug 16, 2025

straighten

Distance — 3.1 km 97 km 30 km 17 km

terrain

Type — Multisports

timer

41 days remaining

Weather History

These values represent the 3-year monthly averages for August in Wengen.

thermostat Temperature

12.9° / 21.3°

wb_sunny Feels like

12.2° / 20.9°

light_mode Avg sunshine hours

11h 10m

water_drop Avg rainfall

5.2 mm

ac_unit Avg snowfall

—

air Avg wind speed

3.5 km/h (Light breeze)

opacity Sweat loss rate

Moderate

terrain Course conditions

Firm and slightly soft

sunny Max UV Index

Moderate (4.9)

humidity_mid Humidity

71.0%

wb_twilight Sunrise

06:27

nightlight Sunset

20:36

About Wengen

Learn more about the host city, Wengen.

Wengen is an Alpine resort in the Bernese Highlands of Switzerland. It's at 1,274 m (4,180 ft) above sea level, reached by cog railway and with no vehicle access, on the route up towards the Eiger and Jungfrau. Its permanent population is about 1300, which swells in summer to 5000 and in winter to 10,000.