Voie d’Arles (Via Tolosana) moves from Mediterranean lowlands to the cooler, wetter Pyrenees, bringing notable contrasts across seasons. Spring and late summer into early autumn often bring milder temperatures and longer days; April, May, and September frequently align with these patterns. Expect variability: exposed, hot stretches near the south in high summer; mixed sunshine and showers in spring and autumn; colder, darker conditions with likely snow or ice near Somport in winter.