Brazil - weather in January

January in Brazil is the central month of summer, and the hottest of the year in the extreme south. In the center-north, where it is hot all year round, one cannot properly speak of seasons, except as regards to the rains. Almost everywhere, January is a hot, muggy and rainy month, except in the far north, in the state of Roraima (see Boa Vista), where we are in the dry season. Rainfall is abundant in the vast Amazon basin, where it can exceed 300 mm (12 in) per month, and in some areas of the south, while it is moderate and not excessive in the east.
Actually, in the easternmost part of the country (see the archipelago of Fernando De Noronha, Natal, Joao Pessoa, Recife, Maceió, Aracaju), where we are at the end of the dry season, the rains are moderate, and with a decent amount of sunshine. This also happens a bit to the south, in the part of the coast facing south-east (see Salvador de Bahia, Caravelas), where the rains are not too frequent and the sun shines quite often.
At sea level, the average temperature is of 29 °C (84 °F) in the extreme north (see Boa Vista) and in the Sertão, the hot and arid area of the northeast (see Teresina), it is about 28 °C (82.5 °F) in the Amazon rainforest and on the north-eastern coast (see Fortaleza), 27.5 °C (81.5 °F) in Rio De Janeiro, 26 °C (79 °F) in the south (see Florianópolis, Porto Alegre) and 24 °C (75 °F) in the southern tip (see Rio Grande).
Although the average temperatures are lower, in the center-south heat waves are more likely, during which the temperature can reach 38/40 °C (100/104 °F).
However, sometimes cool air can arrive in the south, so that the night temperature can drop below 15 °C (59 °F).
The sea is warm enough for swimming anywhere, although in the extreme south (see Rio Grande), the water temperature drops to 23.5 °C (74.5 °F).

While in the north, crossed by the Equator, the day lasts 12 hours all year round, in the center-south, December and January are the months with the longest days, which last up to 14 hours in the far south.




See also: Brazil, the weather in December - February
The climate of Brazil