If you’re hoping to get lost in the rain on your romantic getaway, take a look at these details about year-round temperatures in Barcelos: The hottest months are usually August and July, with an average temperature of 20°C, while the coldest months are February and January, with an average of 10°C. The rainiest months in Barcelos are October, December, November and January, with each month seeing an average of 229 mm of rainfall.