When you start traveling in Ponferrada, in the Castilla y León region, the weather is usually warm. You can expect daytime temperatures around high twenties (Celsius), and nights will be cooler around 13-14°C. There is a lot of sunshine in August, but sometimes there can be light rain or even heavy rain.
As you travel through Galicia, it will still be sunny, but sometimes also cloudy. Daytime temperatures will be around 27-29°C, the night temperatures may drop to 15°C. There is more rain in this area, light rain usually, but sometimes heavy rain can also occur.
When you continue traveling to Santiago de Compostela, the weather will become slightly cooler. Daytime temperatures will be in the middle twenties, and nights can be about 13°C. It will still be sunny most days, but often it will also be cloudy. Here, rain is more common. It can be just light rain or sometimes even heavy rain.
Overall, during your travel, you can expect partly sunny and partly cloudy days, with occasional rain.
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