In the Basque Country, starting in Bayonne and going through towns like Souraïde and Amaiur, you'll usually have nice weather with some clouds and sun. However, you might also experience quite a bit of rain and cloudy days. The average temperature there is comfortable, about 21-22°C during the day and around 14°C at night. There is often rain expected, with about 1.8 mm to 7.6 mm average.
Next, when you reach Navarre, in towns like Berroeta, Olagüe, and Pamplona, you should expect similar weather, with sun and clouds mixed, but also the chance for rainy, cloudier days. The temperatures are pretty much the same, but it can get slightly cooler at night, down to 11°C. Compared to the Basque Country, Navarre tends to get less rain.
While temperatures stay pretty much the same and are generally mild on the Camino de Baztán, there could be different types of weather, from sunny to rainy. So, it's important for those traveling there to be ready for changes in the weather.
Would you like me to add a new feature to the app? Or did you notice that something isn't working the way it should? Please Let me know!