If you're walking the Ruta del Padre Sarmiento in December, the weather can change a lot. You start in Pontevedra and go through places like Sanxenxo, O Grove, and Cambados. It can rain a lot, with some heavy showers. But, there can also be some sunny days. The weather is usually about 13-14°C in the day and 6-7°C at night.
Next, you go through coastal areas like A Illa de Arousa, Vilanova de Arousa, and Vilagacía de Arousa. Here, it can also rain a lot and get a little colder, with temperatures around 8°C at night.
The last part of your trip goes through Padrón to Santiago de Compostela. This part of the journey is often cloudy and gray, with rain showers. It can be colder, with temperatures around 12°C during the day and 5°C at night. Santiago de Compostela also gets more rain.
In short, be ready for different types of weather along the Ruta del Padre Sarmiento. Some days can be sunny, others can be overcast and rainy. The temperatures are usually between 5°C and 14°C. It gets cooler, especially when you reach Santiago de Compostela.
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