IRONMAN 70.3 Switzerland
Course breakdown, historical weather, and field analysis.
Swiss precision on Swiss roads — lake swim and Alpine foothills
Rapperswil-Jona, Switzerland · June 7, 2026
IRONMAN 70.3 Switzerland in Rapperswil-Jona offers a quintessentially Swiss racing experience. A lake swim in the Zürichsee, a rolling bike through the Alpine foothills, and a lakeside run. The Swiss infrastructure, stunning scenery, and efficiently organised race make this a favourite among European triathletes.
- Swim
- 1.9 km
- Lake
- Bike
- 85.2 km
- ↑976m · Rolling
- Run
- 20.9 km
- ↑104m · Flat
- Air Temp
- 10–31°C
- Water Temp
- 17°C
- Wind
- 7 km/h
- SE
Swim Course
Lake swim in the Zürichsee
The swim takes place in the Zürichsee — one of Switzerland's most scenic lakes. The freshwater conditions are calm and clean with excellent visibility. Water temperatures in early June hover around 18–21°C, typically wetsuit-legal. The mountain backdrop and pristine water make this one of the more idyllic swim starts on the circuit.
- Crystal-clear Swiss lake water
- Calm freshwater conditions
- Wetsuit-legal at 18–21°C
- Mountain backdrop to the swim
Bike Course
Rolling roads through the Swiss Alpine foothills
The bike course heads through the rolling countryside and Alpine foothills near Rapperswil. Swiss roads are immaculately maintained, and the course offers a scenic mix of lakeside riding and gentle to moderate climbs. This is rolling rather than mountainous, but the Swiss foothills provide enough elevation to reward climbers.
- Immaculate Swiss road surfaces
- Rolling Alpine foothills with moderate climbing
- Scenic lakeside and countryside sections
- Well-organised course with clear markings
Run Course
Lakeside run in Rapperswil-Jona
The run follows the shores of the Zürichsee through Rapperswil-Jona. The terrain is flat to gently undulating, with lake views throughout. The medieval old town of Rapperswil provides a charming backdrop. Swiss crowds are enthusiastic and well-organised — cow bells included.
- Lakeside running with mountain views
- Flat to gently undulating terrain
- Charming medieval old town backdrop
- Enthusiastic Swiss crowd support
Race Day Conditions
Swiss early summer — mild with mountain weather variability
Early June in the Swiss lowlands offers pleasant racing conditions. Air temperatures range from 14–24°C. Mountain weather can bring variability — sunshine, cloud, and the possibility of afternoon showers. The lake moderates temperatures, preventing extremes. Athletes should prepare for variable conditions but can expect generally comfortable racing.
Race Field Insights
How the Field Performs
Aggregated from 8,376 finishers (2021–2025). Some splits use a reduced year range — see footnotes.
- Total Starters
- 8,899
- Finishers
- 8,376
- DNF Rate
- 5.8%
- Years of Data
- 2021–2025
- Median Finish
- 5h 38m
Finish Time Distribution
How the Median Finisher Spends Race Day
What Each Pace Looks Like
Fast | Solid | Median | Back of Pack | Slow (P90) | ||
|---|---|---|---|---|---|---|
| Swim | 30m 27s | 33m 29s | 37m 00s | 41m 04s | 45m 04s | * |
| Bike | 2h 30m | 2h 41m | 2h 54m | 3h 08m | 3h 23m | |
| Run | 1h 32m | 1h 41m | 1h 54m | 2h 08m | 2h 23m | |
| Finish | 4h 44m | 5h 08m | 5h 38m | 6h 10m | 6h 41m | * |
* Swim data based on 2021–2025 only (earlier years had shortened courses)
* Finish data based on 2021–2025 only (earlier years had course changes in a dependent split)
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