IRONMAN 70.3 Puerto Rico
San Juan, Puerto Rico · usually held in March
Ocean swim · wetsuits usually not allowed
Climbing not published: check the official course profile.
Hot or humid conditions
IRONMAN 70.3 Puerto Rico is a Half / 70.3 triathlon in San Juan, Puerto Rico, usually held in March. Below are the swim, the bike course and the typical conditions around race day, and what they mean for your gear and fueling. Sources are listed at the bottom of the page.
Racing it
The swim
The swim is in the sea. The average water temperature around race day is about 26.9°C (80°F). At that temperature wetsuits are usually not allowed for age-groupers, so plan to swim in your tri suit or a swimskin.
The bike
We haven’t found a published climbing figure for the bike course, so check the course profile in the official athlete guide before you choose your bike and gearing.
Conditions and fueling
Around race day, air temperatures typically run from about 22.4°C (72°F) to a daytime high of about 29.3°C (85°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 Puerto Rico wetsuit legal?
Usually not for age-groupers at the typical water temperature, so plan on a tri suit or swimskin. The final call is made on race day.
How warm is the water at IRONMAN 70.3 Puerto Rico?
The average water temperature around race day is about 26.9°C (80°F). It varies year to year, so check the official update in race week.
Your race, tool by tool
Plan to swim without a wetsuit
Typical water temperature is in our “warm” band: check the race’s wetsuit rule, and consider a sleeveless suit or swimskin.
Check the course profile
The climbing isn’t published, so look at the official course profile: flat courses favour aero, hilly ones gearing.
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 →Your race-day watts and paces
Enter your FTP, threshold pace or heart rate and get targets for this race’s distance and conditions.
Plan my pacing →Conditions are typical, not a forecast. Wetsuit rules, course and aid stations can change: always check the official athlete guide.
Sources: www.endurancesportswire.com, www.ncei.noaa.gov, api.tidesandcurrents.noaa.gov, www.sanjuandailystar.com · water temperature: api.tidesandcurrents.noaa.gov · facts checked 2026-11-02