IRONMAN 70.3 Los Cabos
Los Cabos, Mexico · usually held in April
Ocean swim · wetsuit rule depends on the day
About 11.3 m of climbing per km — rolling, by our rule of thumb.
Hot or humid conditions
IRONMAN 70.3 Los Cabos is a Half / 70.3 triathlon in Los Cabos, Mexico, usually held in April. Below is what the official race information says about the swim, the bike course and the conditions, and what that means for your gear and fueling.
Racing it
The swim
The swim is in the sea. The race lists an average water temperature of about 29°C (84°F). Whether wetsuits are allowed depends on the water temperature on race day, so bring one and check the announcement on the morning.
The bike
The race lists about 1,013 m (3,324 ft) of climbing on the bike course. That’s about 11.3 m per km, rolling by our rule of thumb: pace the climbs and stay aero where you can.
Conditions and fueling
Air temperatures run from about 18°C (64°F) to a daytime high of about 28°C (82°F). By our rule of thumb that’s hot or humid: plan extra fluid and sodium with the Race Nutrition Calculator, and practise drinking on the bike.
FAQ
Is IRONMAN 70.3 Los Cabos wetsuit legal?
It depends on the water temperature on race day. Bring a wetsuit and check the announcement that morning.
How warm is the water at IRONMAN 70.3 Los Cabos?
The race lists an average water temperature of about 29°C (84°F). It varies year to year, so check the official update in race week.
Is the IRONMAN 70.3 Los Cabos bike course hilly?
The race lists about 1,013 m (3,324 ft) of climbing. That’s about 11.3 m per km, rolling by our rule of thumb: pace the climbs and stay aero where you can.
Your race, tool by tool
Pack the wetsuit, decide on race morning
Typical water temperature is in our “warm” band: check the race’s wetsuit rule, and consider a sleeveless suit or swimskin.
Find a wetsuit for this water →Aero helps; climbing matters too
A tri bike or a road bike with clip-ons both work; practise getting in and out of the aero position on the rollers.
Clip-ons or tri bike? →70g carbs · 900mg sodium · 950ml fluid an hour
Calculated for a mid-pack, average-sweat 70–80 kg athlete in these conditions (finish around 5:34). Make it yours in the calculator.
Personalise my fuel plan →Race checklist, pre-filled
Distance, swim and forecast already set for this race.
Open my checklist →Conditions are typical, not a forecast. Wetsuit rules, course and aid stations can change: always check the official athlete guide.
Sources: www.ironman.com · water temperature: https://www.ironman.com/races/im703-los-cabos · facts checked 2026-11-02