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System advances through Southern Brazil with persistent wind, drop in temperatures, and reduced thermal sensation; weather change occurs with the gradual departure of the cyclone and arrival of high pressure, bringing stability and even colder mornings in the last days of April and early May.
The influence of an extratropical cyclone still marks the weather this Tuesday, April 28, 2026, maintaining persistent wind and low thermal sensation in areas of Southern Brazil and neighboring countries, even with the system already moving away from the continent.
At the same time, the atmospheric circulation associated with the phenomenon continues to favor moderate to strong gusts, while a cold air mass advances through the region and sustains the drop in temperatures, reinforcing the typical transition scenario to colder periods in autumn.
Wind in Southern Brazil loses strength throughout the day
Throughout this Tuesday, the wind still blows intensely in much of the South of the country, with gusts that can vary between 40 km/h and 60 km/h, especially in open areas and near the coast, increasing the feeling of cold.
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Even so, the trend indicates a gradual weakening of wind circulation between the afternoon and evening, with a faster reduction inland, while coastal regions remain under the influence of persistent gusts for a longer period.
Cold air mass keeps temperatures low
With the progressive departure of the cyclone, the cold air mass begins to dominate the atmospheric conditions in Southern Brazil, keeping temperatures low throughout the day and especially during the night and early morning hours.
Even though the wind loses strength, the cold remains prominent, as the cold air mass establishes itself over the region, favoring the maintenance of reduced marks and amplifying the thermal sensation typical of this type of climate pattern.
Weather forecast for Wednesday (29)
Starting Wednesday, April 29, 2026, a high-pressure center consolidates over Rio Grande do Sul, bringing stable weather and clearer skies, which favors greater heat loss during the early morning.
In this scenario, the dawn tends to be even colder than the previous day, with an additional drop in minimum temperatures in various areas, especially in lowland regions and lower altitude locations.
During the afternoon, the predominance of the sun contributes to a moderate rise in temperatures, maintaining the typical autumn pattern, characterized by cold mornings and mild afternoons in much of the region.
Thursday (30) continues with stable and cold weather
On Thursday, April 30, 2026, the high-pressure system continues to ensure atmospheric stability in practically all of Southern Brazil, with no signs of rain and predominance of sun throughout the day.
Additionally, the combination of clear skies and weak wind favors new low minimums at dawn, potentially resulting in even lower temperatures in some locations, especially in areas with greater radiative loss.
Even with gradual warming during the afternoon, temperatures do not show significant rises, maintaining the mild climate and reinforcing the stability pattern characteristic of this period.
Friday (May 1) will have a cold dawn and pleasant afternoon
On Friday, May 1, 2026, Labor Day holiday, the atmospheric scenario changes little, with stable weather, predominance of sun, and lower temperatures in the early hours of the day.
In this context, the early morning and dawn remain cold in several cities, while warming throughout the afternoon favors pleasant temperatures, increasing the daily thermal amplitude typical of periods under dry air dominance.
Coastline still feels effects of the cyclone
Even with the gradual improvement of weather conditions in most of the region, areas near the coast may still experience moderate wind at times, especially between Tuesday and Wednesday, prolonging the feeling of cold.
In contrast, inland regions tend to show a quicker reduction in wind intensity, which contributes to more stable nights and favors a greater drop in temperature in the following early mornings.
Trend for the Beginning of May in Southern Brazil
Between the end of April and the beginning of May, the predominant scenario will be stable weather under the influence of the high-pressure system, with no rain and predominantly stable conditions in most of Southern Brazil.
Thus, the sequence of days should maintain the pattern of cold nights and mild afternoons, with this behavior continuing at least at the beginning of the month, without immediate indications of significant changes in atmospheric conditions.
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