Weather

On the day of the race, the weather can have a significant effect on the outcome of a competition as grueling as the Behobia-San Sebastián, because the efforts of the runners increases and there could even be health problems.

The worst possible scenario for the runner is the combination of high temperature, around 20 degrees Celsius and high humidity approaching 100%, which means air saturated with water. Under such conditions, body transpiration is high and the evaporation of sweat decreases to a point at which the body is unable to decrease its temperature. To make matters worse, the sensation of thirst increases and the body becomes dehydrated.

Forecasts

• Euskalmet. Official website of the Basque Meteorological Agency. 6 day forecasts.
• Aemet. Spanish Meteorological Agency. 7 day forecasts.
• Weather.com. Temperature, humidity, pressure and wind chill for the city of San Sebastián.
• La chaîne météo. 12 days forecast in south western France.

(The forecast beyond three days lose reliability)