If you’re hoping to get lost in the rain on your romantic getaway, check out these details about year-round temperatures in Ovar, São João, Arada e São Vicente de Pereira Jusã: The hottest months are usually August and July with an average temp of 69°F, while the coldest months are January and February with an average of 51°F. The rainiest months in Ovar, São João, Arada e São Vicente de Pereira Jusã are December, October, January, and November, with each month seeing an average of 8 inches of rainfall.