Weather forecast for the Caminho da Geira e dos Arrieiros in December

The Caminho da Geira e dos Arrieiros takes you through a varied climate as you traverse from Braga, in Portugal, to Santiago de Compostela, in Spain, crossing multiple distinct regions with their own weather patterns.

In the northern part of Portugal, including Braga and its surrounding areas, you experience mild temperatures with highs averaging around 12-14°C and lows in the range of 4-5°C. December weather tends to be quite changeable, with frequent sunny spells interspersed with periods of rain, including moderate to heavy showers. Overcast days are common, and precipitation levels are generally moderate, typically between 3 to 4 mm/day. As you progress through locations like Caldelas and Campo do Gerês, similar weather patterns persist, although precipitation tends to be slightly lower.

Crossing into northeastern Portugal and approaching the border with Spain, in regions such as Lobios and Castro Laboreiro, weather conditions remain relatively mild but with a higher likelihood of rain. Here, overcast skies and moderate rain showers appear frequently, resulting in slightly higher precipitation levels, especially in Castro Laboreiro where it averages around 4.3 mm/day.

Once in northwestern Spain, passing through Galician towns like Pazos de Arenteiro, Beariz, Codeseda, and finally Santiago de Compostela, the weather becomes markedly wetter. Expect consistent precipitation with averages ranging from 5.4 to 10 mm/day, and an increased frequency of heavy rain and thunderstorms. Temperatures here are slightly milder, ranging from highs of 12-14°C to lows of 6-8°C. Overcast skies dominate the region, making sunny days less common.

Overall, while the route does present a fair number of sunny days, you should be prepared for frequent rain and overcast conditions, particularly as you approach the latter stages in Galicia.