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MetSul Meteorologia warns that the cold air mass that affected Southern Brazil will have a short-lived influence. The weather will be stable between Monday and Thursday with sun and clear skies in Rio Grande do Sul, but a cold front arrives on Friday (1st), the Labor Day holiday, destabilizing the atmosphere with rain throughout the state. On Saturday (2nd), precipitation will intensify in the northern half with a risk of moderate to heavy rain between the Serra, Greater Porto Alegre, and the North Coast.
The mass of cold air that brought down temperatures in Southern Brazil in recent days will be short-lived. MetSul Meteorologia forecasts stable weather in Rio Grande do Sul between this Monday (27th) and Thursday (30th), with sunny days featuring long periods of clear skies and others with few clouds. The exception is the northernmost area of the state, which may experience instability effects from Santa Catarina and Paraná, with the possibility of rain in Gaúcho municipalities near the border between Wednesday and Thursday.
The major weather change, however, is scheduled for Friday (1st). A new cold front is expected to destabilize the atmosphere with rain throughout Rio Grande do Sul right on the Labor Day holiday. On Saturday (2nd), precipitation will intensify over the northern half of the state, with a risk of locally moderate to heavy rain between the Serra, Greater Porto Alegre, and the North Coast. For those who were planning to enjoy the long holiday weekend outdoors in the South, the forecast requires attention starting from Friday.
What to expect between Monday and Thursday in Rio Grande do Sul
The days between Monday (27th) and Thursday (30th) will be the most stable of the week in Rio Grande do Sul. The high atmospheric pressure accompanying the cold air mass ensures clear skies, predominant sun, and no rain in most of the state. The minimum temperatures will still be low in the early mornings, especially in the Serra and Campos de Cima da Serra, but the afternoons will be pleasant with maximums that gradually rise.
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The only exception is for Gaúcho municipalities near the border with Santa Catarina, in the Médio and Alto Uruguai areas. The instability that will be active in the coming days over Santa Catarina and Paraná may cause isolated rain in this strip between Wednesday and Thursday, but without significant volume and without affecting the rest of the state. For most Gaúchos, the four days will be of clear weather with an opportunity to enjoy the sun before the change that arrives on Friday.
The cold front arriving on Friday that changes the holiday scenario
Friday (1st) marks the transition. A new cold front is forming with the approach of another cold air mass and is expected to destabilize the atmosphere throughout Rio Grande do Sul, bringing rain that starts in the West and advances to other regions throughout the day. The Labor Day holiday, which is usually enjoyed for outdoor activities and barbecues, will be compromised by the change in weather.
MetSul indicates that Friday’s rain will not be localized: the instability is widespread and affects all regions of the state. For those who were planning travel or outdoor events, the recommendation is to have an alternative plan and follow the forecast updates throughout the week, as the exact positioning of the cold front could bring forward or delay the start of precipitation by a few hours.
Saturday with risk of heavy rain in the Serra, Porto Alegre, and North Coast
On Saturday (2nd), the rain continues in most regions of Rio Grande do Sul and intensifies over the northern half. MetSul warns of a risk of locally moderate to heavy precipitation between the Serra, Greater Porto Alegre, and the North Coast, areas that concentrate the majority of the Gaúcha population and are sensitive to high volumes of rain due to topography and urbanization.
The risk of heavy rain requires attention from residents in hillside areas and places that historically suffer from flooding. In the Campanha region and the South of the state, the weather is expected to improve throughout Saturday, as the new mass of cold air advances and pushes the instability to the North. The difference between the meteorological situation in the northern half and the southern half of the state will be significant throughout the day.
The sunny and cold Sunday that ends the stretch of instability
The new mass of cold air arriving from the South should bring a more widespread improvement in the weather on Sunday (3rd). The forecast is for a sunny day with cold early morning hours and mild temperatures in the afternoon, ending a weekend that began with rain on Friday and Saturday. According to available data, Sunday’s mass of cold air is not expected to be as intense as the one that was active at the beginning of the week.
For those living in Rio Grande do Sul, the week’s pattern summarizes what autumn is like in the region: a rapid alternation between sunny, cold days and rainy periods brought by cold fronts that follow one another at increasingly shorter intervals as winter approaches. MetSul will continue to update the forecast with regional details, and the Civil Defense can be contacted at 199 in situations of heavy rain or flooding.
How to prepare for the stretch of stable weather followed by rain
The window of good weather between Monday and Thursday is an opportunity to take care of outdoor tasks, check gutters and drains before Friday’s rain, and ensure that vulnerable structures are prepared for the weekend’s precipitation. For rural producers, the sunny days are ideal for harvesting and management tasks that cannot be done on wet soil, and Friday may already compromise field activities.
The general recommendation is to enjoy the sun in the coming days without forgetting that the instability returns quickly. Rio Grande do Sul is experiencing a period where the forecast changes every three or four days, and those who depend on the weather for work, leisure, or travel need to follow the daily updates from MetSul and Inmet to avoid being caught by surprise by Friday’s cold front.
Did you have plans for the Labor Day holiday, or will you have to change everything because of the rain? Tell us in the comments what the weather is like in your city and if you prefer this week’s dry cold or the rain coming this weekend.
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