Brazil's climate has little seasonal variation since most of the country is located within the tropics. Brazil has five climatic regions: equatorial, tropical, semiarid, highland tropical, and subtropical.

Temperatures along the equator are high, with averages above 25 °C, and occasionally reaching the summer extremes of up to 40 °C in the temperate zones.

Southern Brazil has a subtropical temperate weather, normally experiencing frost in the winter (June-August), and occasional snow in the mountainous areas, such as Rio Grande do Sul and Santa Catarina.
The southern cities of Porto Alegre and Curitiba have a subtropical climate and temperatures can fall under 0 °C in the winter.

Temperatures in the cities of São Paulo, Belo Horizonte, and Brasília are moderate, usually ranging between 15 °C and 30 °C, because of their altitude of approximately 1,000 m.

Rio de Janeiro, Recife and Salvador, located in the coast, have warm climates, with average temperatures ranging from 23 °C to 27 °C.

When to go

Amazon

The best time to visit is July-September and December-January because of the low wather season, best time for fishing, swimming and observation of aquatic life in lakes.
Before December, temperatures are higher so waterways are full of vegetation, limiting access to wildlife zones.

Best for Manaus region is March-June when the temperatures are not so high and waterside plants such as acacias, morning glories, or cecropias, flourish at these months.

Pantanal - Bird watching and travel
Best time is dry or intermediary season April-June and October-November. Avoid rainy season from December till March.

Iguassu Falls – the world’s largest waterfalls
March to November is usually considered the best time to visit the Iguassu Falls.

The high season is in January and February, when most Brazilians and Argentineans are in holidays, so it’s a crowded period. The temperatures, humidity and prices are high, but if you want to experience the splendour and the impressiveness, that’s a good period to visit the Iguassu Falls.

If you want to avoid crowded periods, avoid the Easter time also. There is a strong Brazilian and Argentinean tradition to visit the Iguassu Falls in Easter.

May and July are rainy months and the volume of the waters is at its maximum.

If you want to enjoy an agreeable temperature, lower prices, less people and a very low probability of a troubling rainy day, September and October are great months for your travel to the Iguassu Falls.

Rio de Janeiro
The high season in Rio is summer (December to March), but this high season is also the most crowded period and has the highest hotel prices.

So, off-season (May-October) is also a good option, if you are looking for low hotel prices and don’t mind to face the risk of having some days of lower temperatures: Rio’s winter temperatures stay around 20sº C, dipping occasionally below the 15ºC (there are some short periods of low temperatures, and beach life isn’t agreeable).

Best Brazilian Tropical Beaches: Bahia
Temperatures rarely dip below 25ºC or rise beyond 33ºC. Winter temperatures are just 3-4ºC degrees below the summer temperatures.

The factor you may equate to your travel, is the rain and the ambiance. In Salvador and Recife regions the rainy season begins around the beginning of April, and lasts three months, more or less. At Fortaleza the rain begins a little later (advanced April or May) and lasts also three months.

Sao Paulo
Sao Paulo has many days with agreeable temperatures and good weather, but also that the summer (22nd December - 21st March) may be very sticky and the winter can have very cold days (22nd June - 21st September). That’s why the intermediate months are the best for traveling to Sao Paulo and its surroundings.

Brazilian south
The south of Brazil has a more conventional four-season climate, with a cold winter (winter temperatures and evenings can be low and uncomfortable: 5°C-8°C) and a hot summer.

The best time to visit those regions – if you want to profit from nearby beaches - is summer (December-March) and the months closer to summer.

Cities

Salvador - Now: 72F / Low: 74F / High: 82F


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