If you're traveling along the Camino del Piamonte in August, it's usually warm and sunny. You'll start in the city of Narbonne where it can get as hot as 30°C during the day and cool down to 20°C at night. Though usually sunny, there can be occasional rain.
Next, you'll go through Saint-André-de-Roquelongue and Lagrasse, where it's also usually sunny with some rain. The same weather continues to Montréal, with temperatures around 30°C in the day and mid-teens at night.
The weather changes a little when you reach Fanjeaux and Mirepoix, it becomes a bit cooler and might rain more. Pamiers and Le Mas-d'Azil also have similar weather, with temperatures near 25°C and more rain especially, in early and mid-August. This is especially true for areas at higher altitudes, like Portet d'Aspet and Juzet-d'Izaut. The weather there can be unpredictable with temperatures around 20°C.
Near Saint-Bertrand-de-Comminges and Montserié, temperatures may rise a bit, but it rains more often. This is also the case as you continue into Moulin des Baronnies, Bagnères-de-Bigorre and Germ-sur-l'Ossouet. There, the temperature is usually around 25°C, but rain is possible.
Once you get close to Lourdes, Saint-Pé-de-Bigorre, Bruges, Buzy, and Oloron-Sainte-Marie, it's usually sunnier. The temperature might reach 29°C, and it won't rain as often. However, towards the end of the journey in Mauléon-Licharre to Saint-Jean-Pied-de-Port, the weather can be different each day, anything from sunny to cloudy to rainy. Temperatures are in the upper 20s, and at night it can cool down to around 18°C.
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