IRONMAN 70.3 Portugal-Cascais
Course breakdown, historical weather, and field analysis.
Rolling roads through Cascais
Cascais, Portugal · October 18, 2026
IRONMAN 70.3 Portugal-Cascais takes place in Cascais, Portugal on October 18, 2026. The half-distance course covers a 1.91 km swim, 90.2 km bike with 741m of climbing, and a 21.2 km run.
- Swim
- 1.9 km
- Ocean_sheltered
- Bike
- 90.2 km
- ↑760m · Rolling
- Run
- 21.2 km
- ↑127m · Rolling
- Air Temp
- 15–25°C
- Water Temp
- 18°C
- Wind
- 11 km/h
- SW
Swim Course
Ocean_sheltered swim — 1.91 km
Athletes face a 1.91 km swim in ocean_sheltered conditions. Wetsuits are permitted and recommended at this water temperature.
- Ocean_sheltered swim
- 18°C average water temperature
- 4 sharp turns
Bike Course
Rolling terrain with 741m of elevation
The bike course covers 90.2 km across rolling terrain with 741m of total climbing.
- 741m total elevation gain
- 8.2 m/km average gradient
- 14 categorised climbs
- 3 U-turns
- 116 sharp turns
- Rolling terrain profile
Run Course
21.2 km run to the finish
The run covers 21.2 km on rolling terrain with 126m of climbing.
- 126m total elevation gain
- 6.0 m/km average gradient
- 7 categorised climbs
- 5 U-turns
- 52 sharp turns
- Rolling terrain profile
Race Day Conditions
Warm conditions on race day
Based on historical averages, expect temperatures around 20°C on race day. Winds average 11 km/h.
Race Field Insights
How the Field Performs
Aggregated from 9,774 finishers (2021–2025)
- Total Starters
- 10,250
- Finishers
- 9,774
- DNF Rate
- 3.7%
- Years of Data
- 2021–2025
- Median Finish
- 5h 49m
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 25s | 33m 51s | 37m 47s | 42m 13s | 46m 56s |
| Bike | 2h 34m | 2h 44m | 2h 58m | 3h 15m | 3h 33m |
| Run | 1h 35m | 1h 45m | 1h 58m | 2h 14m | 2h 32m |
| Finish | 4h 54m | 5h 19m | 5h 49m | 6h 26m | 7h 03m |
Plan IRONMAN 70.3 Portugal-Cascais with Keiro
Get a complete pacing strategy for every discipline — built from this course, forecast weather, and your fitness.
Independent analysis. KeiroLabs is not the event organizer and is not affiliated with the race organizer.