Porto in September is usually warm, sunny, and around 20 degrees Celsius. You can expect good weather, which is great for starting your journey.
As you go up to the coastal towns like Labruge, Póvoa de Varzim, and Marinhas, the weather will most likely stay sunny, but there may be a little rain or some clouds. During the day, it stays warm around 20 degrees but during the night, it's a comfortable 16 to 18 degrees.
Going through Viana do Castelo, Caminha, to A Ramallosa, the weather is usually similar. It is often sunny, but there might be some stronger rain showers. The temperature usually stays comfortable during the day and at night.
When you get to Galicia and visit cities like Vigo, Redondela, and Pontevedra, the weather could change more often, and you might see more clouds and some rain. The temperature gets a bit cooler, but it is still warm during the day and cool during the night.
The last part of your trip, going through Caldas de Reis, Padrón, and ending at Santiago de Compostela, could have a mix of sunny, cloudy, and rainy days. The temperature will become cooler during the day, around low 20s, and also cooler at night. It may also rain more, so it's a good idea to be ready for this.
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