Weather lowdown. July and August are the hottest months of the year in the Algarve region, and also the sunniest and driest. July is the sunniest month of all on average, with an average of 369 hours of bright sunshine at the regionâs capital, Faro, which is an average of just under 12 hours per day.uly is the sunniest month of all on average, with an average of 369 hours of bright sunshine at the regionâs capital, Faro, which is an average of just under 12 hours per day.