Weather: Porto Half Marathon
Typical climate in September (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
20°C
Temperature
Range: 15°C – 24°C
76%
Humidity
High — increase hydration
15%
Rain Chance
Low chance of rain
September
Typical race month
Usually on a Sunday
Conditions
Mid-September in Porto is mild to warm: average highs are around 24°C and lows around 15°C, with relative humidity near 76%. Hot weather on race day in 2026 caused several runners to collapse, so the 9:00 am start can be warm.
What to Wear
Light cap or visor
Shield from sun and heat
Sunscreen SPF 30+
20°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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