2026 Jungfrau Marathon - Sep 5 Countdown

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Race Information

Race	2026 Jungfrau Marathon - Sep 5
City	Interlaken
Date	2026-09-05 at 08:30
Field Size	~4,000 runners
Time Limit	6 hours 30 min
Cutoff pace	9:15/km
Timezone	Europe/Zurich
Official Site	Jungfrau-Marathon AG
Registration	Register · 250 CHF

Race Day Weather

Average Temperature	9.9°C / 50°F
Humidity	81%
Wind	10 km/h
Rain Chance	52%
Typical Conditions	Cool alpine September with possible afternoon showers above 2000m

What to Prepare: Start temperature in Interlaken (~12°C) climbs and then drops sharply as you ascend to the 2320m Eigergletscher finish. Pack a light shell for the final 12km. Hydration matters more than fueling — dry alpine air dehydrates fast.

Based on historical averages for race week. Use our Weather Score Calculator and What to Wear Guide for personalized advice.

Wind Impact on Race Day

Wind at 10 km/h can affect your marathon pace by 5-15 seconds per kilometer. Headwinds slow you down exponentially — a 20 km/h wind costs more than twice a 10 km/h wind.

Calculate your wind-adjusted pace →

Race-Week Climate

Based on 20 years of race-week weather (2005-2024), MERRA-2 reanalysis

	Cooler	Typical	Warmer
Temperature	5.2°C	10.5°C	13.7°C
Dew point	2.2°C	6.9°C	9.7°C

Wet-day chance: 52% Runnability: 74/100

Data: NASA POWER (MERRA-2 reanalysis), NASA Langley Research Center

Course Profile

Course Type	Mountain point-to-point
Elevation Gain	1953m
Terrain	Mixed road, trail, alpine path
Profile	Start in Interlaken (568m) along Lake Brienz, climb through Lauterbrunnen, Wengen, and the Lauberhorn slopes to finish at Eigergletscher station (2,320m). Total elevation gain: 1,953m — the largest of any mass-participation marathon in Europe. First 10km flat, gentle rise to Lauterbrunnen at km 20, then the brutal sustained climb begins — 1,043m of vertical in the final ~22km. Open entry but sells out annually — ~4,000 entries snapped up across 50+ countries each year (~3,500-3,700 typical finishers). Men's course record: Jonathan Wyatt 2:49:01 (NZL, 2003). Women's: Maude Mathys 3:12:56 (SUI, 2017).