a trip to the beach during this month is certainly still viable, especially during the hotter hours of mid-day - between one and three pm or so.

early-morning fog is common during may, which may affect drives throughout the city, though it generally disperses to expose bright sunshine by mid-day.

clouds and rain are also common, especially in the chilly mornings - for this reason it is best to always dress in layers while touring rio de janeiro during this month, as the temperatures will range quite significantly throughout even just a single day.