Rio Marathon

Rio Marathon 2026 Course Analysis

Rio Marathon is a full marathon held in Rio de Janeiro, Brazil, scheduled for Sunday 21 June 2026. The course is run on road surface with 74m of total elevation gain, reaching a maximum altitude of 8m above sea level. For registration and full race details, visit the official Rio Marathon website.

Elevation Profile

This is a very flat course with only 74m of total elevation gain across the full distance. The course ranges from 0m to 8m above sea level — a 8m elevation range that makes it one of the flatter races available. Runners targeting a personal best will appreciate the minimal climbing.

Expected Race Day Weather

Based on historical weather data for June, the expected race day conditions are as follows. Hot conditions are expected, with temperatures between 18°C and 27°C. Heat is one of the biggest performance factors in marathon running — research shows that for every degree above 15°C, marathon times slow by approximately 1-2%. Extra hydration and a conservative start are strongly recommended. There is a low chance of rain (0%), so dry conditions are likely.

Surface Type: Road

Rio Marathon is run on road surfaces, which provide the fastest and most predictable conditions for marathon running. Road courses allow for consistent pacing and are typically the best choice for runners targeting a personal best time.

How Difficult Is Rio Marathon?

Our difficulty rating for Rio Marathon is calculated using a model that combines elevation gain, temperature impact, and surface type. Use the difficulty calculator above to enter your target finish time and see exactly how many minutes this course would add or subtract compared to a perfectly flat, cool, road-based marathon. Faster runners and slower runners are affected differently by the same course conditions, so the difficulty is personalised to your pace.

Looking for an easier marathon or a tougher challenge? You can also compare Rio Marathon against other marathons to find the right race for your goals.