In the beginning, from Somport to Arrés, you'll have some sunny days and sometimes moderate rain. The temperature will be between 12 - 22°C. Rain can happen any time and could stop your sunny moments, as it can sometimes go from 2.8 - 5.4 mm/day.
When you get to the middle of the Route, which includes Ruesta and Sangüesa, you'll have more sun. But, moderate to heavy rain could still happen. The temperature will be quite comfortable, from low twenties to a high of 27°C in Sangüesa. The amount of rain becomes less at this point, from 0.5 - 3.8 mm/day.
For the last part of your journey, from Monreal to Puente la Reina, the weather changes a lot but there's less rain. Typically, you'll have partly cloudy to sunny days with temperatures between 14°C and 28°C. The amount of rain is even lesser here, from 0.2 mm/day in Monreal to 1.2 mm/day in Puente la Reina. So, it gets drier as you near the end of the Camino Aragonés.
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