When you travel to Rio, the great thing is that it is very warm all year round. During the summer months, it can get very hot at times with high humidity. During the winter, it also rarely gets cold which makes Rio a terrific holiday spot all year long - The lowest it'll ever get is around 14 Deg C (57 Deg. F). If you love a warm climate, the weather in Rio de Janeiro will be perfect for you!
Summer is generally considered to include December, January, February and part of March. During this time, December and January are the hottest months with temperatures going over 104 Deg. F (40 Deg. C). December through April are also the months with the most average rainfall. These rainfalls range from afternoon showers to several consecutive days of rain.
Summer is also host to the two biggest events of the year n Rio, the first being the New Years Eve celebrations on Copacabana beach, widely considered one of the world's most famous parties and fireworks displays. On Copacabana beach alone, it is customary to see several million revellers gather for this famous event.
Carnaval is the second big event of the summer in Rio. It is truly one of the most electric celebrations in all of the world.
During both New Years Eve and Carnaval, the city fills with tourists. However, many locals who can afford it take advantage of the time off and travel outside of the city.
The "winter" months in Rio are considered to be July, August and September. However, during this time It never really gets cold. This period also has the least amount of rainfall of the year. Although it rarely gets cold in Rio, a cloudy or rainy day can be a bit chilly to be out on the beach. On the other hand, a sunny day will be very nice to lounge on the beach and take in the sun and terrific scenery without the humidity of summer. For this reason, the beach is really an option all year long in Rio. During this time of the year, average high temperatures are around 75 Deg. F (25 Deg. C).