Portuguese 
English 
Spanish 
5 min of reading 
0 comments 
The coldest region of Brazil will register highs between 32 and 35 degrees in the first days of April due to a mass of hot air of tropical origin that keeps temperatures above average in Rio Grande do Sul, in the Southeast and in the Midwest, and the forecast from MetSul indicates that the heat should only give way in the last week of the month with the arrival of an intense cold front capable of bringing down the thermometers in the South
The coldest region of Brazil will be very hot in the first days of April.
Rio Grande do Sul, traditionally associated with mild temperatures in autumn, is expected to register highs between 32 and 35 degrees in areas of the West and Northwest of the state.
In the capital Porto Alegre and the metropolitan region, thermometers are expected to vary between 30 and 32 degrees in the first days of the month, with summer characteristics in the middle of autumn in the coldest region of Brazil.
-
Goodbye common refrigerator: essential appliance starts to gain competition with technology that preserves food for longer and reduces waste.
-
Germany discovers how to reuse old window glass without melting anything and can transform 220,000 tons per year into new high-performance panels, using material from nearly 150 million old windows that would be discarded.
-
China creates hypersonic engine that can make planes and missiles fly more than 6 times the speed of sound with less weight, more range, and without system change.
-
Mysterious object on Mars divides NASA and Harvard after Curiosity image reignites suspicions about what was really found on the planet.
The cause is a mass of hot air of tropical origin that has settled over the South of the country and keeps temperatures above the historical average for the period.
The heat is not limited to the coldest region of Brazil: the Southeast and the Midwest are also expected to register above-normal temperatures in April.
The change is only expected to happen in the last week of the month, when a more intense cold front may finally bring down the thermometers in the South and parts of the Southeast.
Why the coldest region of Brazil will register 35 degrees in April
April should be the month when the coldest region of Brazil begins to feel the first cold mornings and temperatures drop to the range of 15 to 20 degrees.
But in 2026, a mass of hot air of tropical origin is preventing cold air from reaching the South of the country, keeping thermometers at summer-like levels.
According to forecasts from MetSul, highs in Rio Grande do Sul may exceed 30 degrees in most cities during the first days of April.
In the areas of the West and Northwest of Rio Grande do Sul, thermometers may reach 35 degrees, a value completely out of the standard for the coldest region of Brazil at this time of year.
The pattern is repeated in other states in the South, such as Santa Catarina and Paraná, where above-average heat is also expected for the beginning of the month.
For those who expected to take their coat out of the closet in April, the message is clear: it is not time yet.
The heat that hits the coldest region of Brazil also affects the Southeast and the Midwest
The above-average heat is not exclusive to the coldest region of Brazil.
The Southeast and the Midwest are also expected to register above the historical average temperatures for April, with hot days and muggy nights in states like São Paulo, Rio de Janeiro, and Minas Gerais.
The action of a high-pressure zone over the South Atlantic contributes to keeping the hot air stationary over the interior of the country.
This atmospheric blockage is the same mechanism that prevents cold fronts from advancing across the continent, diverting them to the ocean before they can bring cold air inland.
As long as the blockage persists, the coldest region of Brazil and much of the Southeast and Midwest will continue with above-normal temperatures, in a scenario that mixes summer heat with the transition of autumn.
The National Institute of Meteorology issued danger and potential danger alerts for different areas of the country, indicating the risk of rainfall accumulations that may reach 100 millimeters per day in some regions.
When the cold finally arrives in the coldest region of Brazil in April 2026
The forecast indicates that the most significant temperature change is scheduled for the last week of April.
A more intense cold front is expected to advance across the country at the end of the month, causing a significant drop in thermometers in the South and parts of the Southeast.
This cold front is different from those that passed in previous weeks: it is expected to have enough strength to break the atmospheric blockage and push cold air into the interior of the continent.
When this happens, the coldest region of Brazil will finally feel temperatures consistent with autumn, with lows that may drop to around 10 degrees or less in mountainous areas.
Until then, the beginning of April maintains the combination of above-normal heat and occasional instabilities, with heavy rain showers that may occur even on hot days, typical of a transitional period.
The coldest region of Brazil will heat up before cooling down, and those living in the South need to prepare for two weeks of heat before true autumn finally sets in.
What explains such a hot autumn in the coldest region of Brazil in 2026
The warm start of April in the coldest region of Brazil is the result of a transitional climate pattern that combines atmospheric blockages with persistent tropical air masses.
These blockages reduce air humidity, hinder the entry of cold fronts into the interior, and keep hot air stationary over the South and Southeast for several days.
In the North and Northeast, the action of the Intertropical Convergence Zone favors thunderstorms with high rainfall volumes and gusty winds, in contrast to the dry heat that dominates the South.
The scenario is typical of years when the transition between summer and autumn takes longer than normal to consolidate.
For the coldest region of Brazil, this means days with summer characteristics in the middle of April, muggy nights, and a feeling that the hottest season simply refuses to leave.
The forecast is that the pattern will normalize in the last week of April, when the intense cold front is expected to finally bring the autumn that everyone has been waiting for since March.
Heat of 35 degrees where it should be cold and an autumn that does not arrive
The coldest region of Brazil will register highs of up to 35 degrees in the first days of April, with above-average heat throughout the South, Southeast, and Midwest.
The cold is only expected to arrive in the last week of the month with an intense cold front, and until then, the coldest region of Brazil is experiencing a summer scenario in the middle of autumn.
If you live in the South and were expecting the cold of April, you will need more patience. The coat may stay in the closet for a few more weeks.
Are you feeling the out-of-season heat in your city? Were you expecting cold in April and got heat instead? Do you think this pattern will repeat in the coming years? Leave your comments and share this article with those living in the South who can’t wait for autumn to arrive.
Seja o primeiro a reagir!