The region's climate is greatly influenced by the orographic characteristics and the already mentioned fluvial network. The most significant feature is the yearly rain levels - an average of 1500 mm - and its irregular distribution along the year, concentrated in Winter and Spring.

On the other hand, the air temperature along the year develops similarly with the precipitation. The higher temperatures occur at the same time as the lowest precipitation - hot and dry end of Spring and Summer - and the lower temperatures with the highest precipitation - cold and rainy Winters.

In what concerns the annual average temperature, the average of high temperatures and the average of low temperatures is not too high, reflecting a mild climate.

Regarding the terrain, the region has a rather irregular topography, characterised by a compact valley's system combined with the fluvial network, developing from the seaside to the inland.