IRONMAN

IRONMAN Portugal-Cascais

Saturday, 17 October 2026

IRONMAN Portugal–Cascais is a rolling 179.9 km bike paired with a 42.2 km run, where a steady W wind (around 6.3 m/s) and mild-to-warm air (16.2–20.5°C) shape pacing and fueling.

· 13 days to go
Air
16–21°
typical
Wind
6.3 W
prevailing
Water
18.7°
typical — confirm
Bike climb
+1160 m
Race-day forecast — 13 days outupdated 6h ago
14–22°
temp
30 km/h
wind NE
7%
rain chance
0 mm
rain total
05:00
☀️
15°
24 NE
☂ 6%
06:00
☀️
14°
23 NE
☂ 6%
07:00
☀️
14°
22 NE
☂ 6%
08:00
☀️
15°
21 NE
☂ 6%
09:00
☀️
16°
21 NE
☂ 5%
10:00
☀️
18°
20 NE
☂ 5%
11:00
☀️
20°
20 NE
☂ 5%
12:00
☀️
21°
19 NE
☂ 4%
13:00
☀️
22°
20 NE
☂ 4%
14:00
☀️
22°
21 NE
☂ 4%
15:00
☀️
21°
22 NE
☂ 5%
16:00
☀️
20°
25 NE
☂ 5%
17:00
☀️
19°
27 N
☂ 5%
18:00
☀️
18°
29 N
☂ 6%
19:00
☀️
18°
30 N
☂ 6%
20:00
☀️
18°
29 N
☂ 6%
21:00
☀️
18°
27 N
☂ 5%
Sunrise 07:48 · Sunset 18:56 · UV max 5 · gusts to 63 km/h
Actual forecast for this race date — refreshed daily as it approaches. The chips above are the 10-year typical.
Fueling — per hour
early outlook · 13 days out
90 g
carbs
700 mg
sodium
-50 mg vs typical
600 ml
fluid
-50 ml vs typical
  • 👍 Conditions are kind — the 600 ml/h fluid, 700 mg/h sodium and 90 g/h carbs baseline should hold. Fine-tune to your own thirst and sweat rate.
Build your fuel plan — which gels, how many per hourFuel tool →
Based on the race-day forecast (feels-like up to ~18°) — sharpens as the race nears. Baseline for a ~12 h finish, 70 kg athlete. Scale to your own body mass and sweat rate.

Typical 10-year conditions, not a forecast. Water temperature and the wetsuit ruling are set on race morning — check the IRONMAN race guide →

Worlds qualification — 55 slots at this racesee who qualified →
0 km90 km180 km191 m
179.9 km · +1160 m climbing
T1 — swim to bike

Own the swim-to-bike handoff: after the swim, move quickly but not wildly, get socks/kit on efficiently, and commit to a mounting rhythm that doesn’t jolt your system. As you transition out of T1, take the first kilometers to find your cadence, settle your breathing, and confirm your drink-bottle access. Given the rolling profile and the W wind (6.3 m/s), be ready to keep power/effort slightly conservative early—use the first part of the bike to “set your race,” not to prove you can go hard immediately.

During the bike

The bike covers 179.9 km with about 1,160 m of elevation gain on a rolling course, so expect repeated changes in resistance where pacing discipline matters. The W wind at roughly 6.3 m/s means you’ll feel it more strongly on exposed sections—use it to stabilize effort: work a bit when you’re sheltered or on steadier sections, then avoid spiking power when the wind hits. Nutrition and hydration should start early and stay consistent: target carbs 90 g/hr, sodium 750 mg/hr, and fluid 650 ml/hr throughout the bike rather than trying to “catch up” later. On rolling terrain, take in fuel on the steadier stretches and keep your body position efficient so you don’t waste watts during climbs or accelerations; if you’re behind on fluids, correct gradually, not all at once.

Closing notes

As the bike winds down, tighten your plan for the run: stay smooth, keep taking in fluids until transition, and avoid letting the rolling effort turn into uncontrolled surges. Enter T2 feeling like you could hold the first 10–15 minutes of run—if your legs feel destroyed, your bike pacing was too hot.

Results by year

Every edition of this race in our database. The course and conditions can shift year to year — see who qualified and the World Championship slot rolldown for each.

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Weather is a 10-year climatology (typical, not a forecast). Course tracks are approximate, derived for planning — verify against the official course. Maps © OpenStreetMap. Not affiliated with or endorsed by the IRONMAN Group.