The weather in Braga is favored by the Atlantic influence due to the west winds that are brought through the main valleys, carrying great masses of humid air. We can thus consider that the region’s weather is mild and has the four seasons quite defined. Actually, these air masses maintain the relative humidity in values of about 80%, allowing the maintenance of an average annual temperature of 12.5° C to 17.5° C. Meanwhile, due to the increasing cooling during the night, it often causes frost, which lasts over a period of three to four months. The annual precipitation values attain 1659 mm/ 65.3, being more intense during the Autumn, Winter and Spring.
The winters are quite rainy and cold, and usually with moderated southwest winds. In very cold years snow falls may occur. Springs are typically fresh, the morning breezes occur more frequently, mostly in higher altitudes.
We should point out that thunderstorms are quite frequent during May, due to the warming of humid air with the arrival of Summer. Summers are hot and sunny with east mild winds.
In cooler days, rain may fall in short periods, which makes this quite important to the vegetation. The region is known as Green Minho due to the green vegetation all year round. Autumns are mild and rainy, usually with moderated winds. While the temperature decreases, the rain levels rise reaching the highest values in the year. There is often fog. In the Cávado River valley fog is quite dense in the mornings.