Weather: Rio de Janeiro Marathon
Typical climate in May (an estimate, not measured race-day data). Use it to plan your race strategy, clothing, and hydration.
Typical climate for the race month — an estimate, not a forecast or a race-day record
24°C
Temperature
Range: 21°C – 28°C
80%
Humidity
High — increase hydration
19%
Rain Chance
Low chance of rain
May
Typical race month
Usually on a Sunday
Conditions
Late May in Rio is warm and humid: highs average about 28°C and lows about 21°C, with humidity around 80%. The marathon starts at 05:30, in the cooler hours before sunrise.
What to Wear
Light cap or visor
Shield from sun and heat
Sunscreen SPF 30+
24°C means sun exposure risk
Extra hydration plan
Increase fluid intake in heat
Hydration Strategy
Before the Race
Hydrate aggressively in the 24 hours before. Aim for clear urine the morning of the race.
During the Race
Take water at every aid station. Consider sports drink for electrolytes. Don't wait until you're thirsty.
After the Race
Rehydrate within 30 minutes of finishing. A drink with electrolytes and some protein helps recovery.
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