August on the Camino Portugués de la Costa brings mild to warm afternoons, often peaking between 21 °C and 30 °C, with relatively cooler mornings at 12 °C to 18 °C. Sunshine is abundant, although occasional rainfall opportunities occur, varying from brief showers to moderate rain. The blend of coastal breezes and the Atlantic influence contributes to this variable weather, creating an inviting yet occasionally unpredictable environment for outdoor activities along the route.
Beginning the Camino in Porto, August generally features sunny days interspersed with some cloudy spells and sporadic rain showers. The temperature reliably warms into the 20s °C, with highs often reaching up to 31 °C, and nights feeling fresh from 13 °C to 19 °C. As the path progresses towards Marinhas and Viana do Castelo, expect predominantly sunny weather, although notable heavy rain may temporarily visit the area. The daytime warmth varies, occasionally soaring close to 38 °C, especially notable further inland, while coastal stages remain slightly cooler.
Crossing into Galicia, starting at locations such as A Ramallosa and Vigo, the climate maintains its warmth with highs typically between 20 °C and 31 °C, descending to a mild 9 °C to 17 °C at night. Sunny intervals frequently dominate, yet short episodes of rain or showers punctuate the warmth. Moving from Vigo to Santiago de Compostela, the same pattern persists with brief rain showers being more pronounced. The temperatures hover at similar levels, and as you approach the Galician heartlands in Santiago, moderate rainfall combined with overcast days can emerge every so often, offering a cooling relief.
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