Prepare your coat at the beach: extratropical cyclone will create a cold front and cause a radical change on the coast of SP, with over 60mm of rain, lightning, strong winds, rough seas, and a sharp drop of up to 10°C on the holiday.

Written by Alisson Ficher

Published on 29/04/2026 at 16:52

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Abrupt weather change expected to surprise tourists on the São Paulo coast during the holiday, with heat initially and intense storms on Sunday, including heavy rain, strong winds, rough seas, and a sharp drop in temperature in a short period.

The extended Labor Day holiday begins with predominant sun and heat on the São Paulo coast, but the forecast indicates a **marked change in weather between Saturday, May 2, and Sunday, May 3**, requiring attention due to the rapid transformation of atmospheric conditions.

With the approach of meteorological systems coming from the South of the country, **a cold front associated with an extratropical cyclone** is expected to advance along the coast, causing heavy rain, lightning, wind gusts, and a significant change in sea conditions throughout the weekend.

Given this scenario, residents, tourists, and drivers circulating through Baixada Santista, the North Coast, and mountain regions need to redouble precautions, as Sunday concentrates the most critical period, with potential for high accumulated rainfall in a short interval.

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Cold front changes weather on the São Paulo coast

While the first half of the holiday maintains typical characteristics of warm days, Friday, May 1, and Saturday, May 2, are expected to register high temperatures, with **maximums ranging between 26°C and 32°C** in different points of the coastal strip.

The change begins to take shape with the advance of a cold front over the South and Southeast, driven by an extratropical cyclone offshore, while a cold air mass advances in the rear and intensifies the thermal contrast.

Gradually, cloudiness increases over the São Paulo coast, winds begin to blow from other directions, and high humidity creates favorable conditions for the formation of instability areas, making the transition noticeable from Saturday night.

Sunday concentrates higher risk of storms

On Sunday, May 3, the scenario changes more forcefully, being considered the period of greatest attention for the entire coastal strip, especially due to the intensification of atmospheric instabilities forecast for the day.

According to Climatempo, there is a possibility of **heavy rain with accumulations exceeding 60 mm in a few hours**, a condition that increases the risk of flooding, flash floods, and other disruptions in urban areas and more vulnerable regions.

In hillside areas, riverbanks, or neighborhoods with a history of flooding, monitoring should be constant, as saturated soil and concentrated rainfall increase the likelihood of occurrences associated with excess water.

Furthermore, the combination of atmospheric instability favors the occurrence of **lightning and wind gusts**, which requires extra caution on beaches, marinas, and open areas, where exposure during storms poses a greater risk.

Rough seas and risk of heavy swell on the coast

Parallel to the weather changes, sea behavior also tends to alter throughout the weekend, influenced by the low-pressure system acting over the ocean, which intensifies sea agitation.

Under these conditions, there is a **risk of heavy swell and difficulty for navigation**, especially for small vessels, in addition to greater danger for bathers in areas with strong waves and more intense currents.

In stretches of the coastline considered more vulnerable, the advance of waves can occur during periods of high tide, amplifying impacts on coastal structures and requiring extra caution from those frequenting these areas.

Temperature drop surprises after heat

After two days of more intense heat, the arrival of cold air causes a significant change in the thermal pattern of the São Paulo coast, especially from Sunday, when the perceived temperature already begins to drop more noticeably.

In this context, maximums should be close to **23°C, representing a drop of up to 10°C compared to previous days**, a difference that becomes even more evident due to the presence of humid wind and reduced sun exposure.

The thermal sensation tends to be even lower, which requires preparation from those traveling to the beach, as the contrast between the days can surprise those expecting to maintain the same climatic pattern as the beginning of the holiday.

On Monday, May 4, although the cold front begins to gradually move away, the polar air mass still acts over the region, keeping the weather cooler and preventing the immediate return of higher temperatures.

Highways require attention on holiday return

With the change in weather conditions, the return from the coast may occur under intense rain, wet roads, and reduced visibility, factors that increase the risk of accidents, especially on mountain stretches.

Drivers using the Anchieta-Imigrantes System, the Rio-Santos highway, and other roads in the region should maintain constant attention, considering the possibility of fog, strong winds, and water accumulation on the road.

Given these conditions, it is essential to follow updates from authorities, respect signage, and avoid travel during periods of heaviest rainfall, reducing exposure to risk situations.

Furthermore, announcements from the Civil Defense and meteorological services should be observed frequently, especially in unstable scenarios, when rapid changes can occur within a few hours.

In situations of intense rain, the guidance remains focused on prevention, avoiding flooded areas, not crossing flash floods, and seeking safe places until conditions improve.

Prepare your coat at the beach: extratropical cyclone will create a cold front and cause a radical change on the coast of SP, with over 60mm of rain, lightning, strong winds, rough seas, and a sharp drop of up to 10°C on the holiday.

Abrupt weather change expected to surprise tourists on the São Paulo coast during the holiday, with heat initially and intense storms on Sunday, including heavy rain, strong winds, rough seas, and a sharp drop in temperature in a short period.

Cold front changes weather on the São Paulo coast

Sunday concentrates higher risk of storms

Rough seas and risk of heavy swell on the coast

Temperature drop surprises after heat

Highways require attention on holiday return

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Prepare your coat at the beach: extratropical cyclone will create a cold front and cause a radical change on the coast of SP, with over 60mm of rain, lightning, strong winds, rough seas, and a sharp drop of up to 10°C on the holiday.

Abrupt weather change expected to surprise tourists on the São Paulo coast during the holiday, with heat initially and intense storms on Sunday, including heavy rain, strong winds, rough seas, and a sharp drop in temperature in a short period.

Cold front changes weather on the São Paulo coast

Sunday concentrates higher risk of storms

Rough seas and risk of heavy swell on the coast

Temperature drop surprises after heat

Highways require attention on holiday return

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Great Atlantic Sargassum Belt has ceased to be a climatic phenomenon and has become a biological system that feeds on itself, with 8,000 kilometers in length, 37 million tons of algae, and scientists confirm that it is now permanent.

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Brazil will harvest a record crop of up to 357 million tons of grains, but it does not have the capacity to store a large part of it. The storage deficit has reached the highest level in history and is equivalent to almost the entire production of Argentina.

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