Tuesday marks the peak of the third heatwave that will hit the AMBA throughout the week

The Greater Buenos Aires Area is preparing for a stressful week dominated by the third heatwave of the summer season. The weather event will last from Monday through Friday, when a cold front will finally arrive bringing scarce rainfall. Tuesday will be the most critical day, reaching extreme temperatures of up to 36°C that will challenge the population’s heat tolerance.

This heatwave stands out not only for its maximum temperatures but mainly for the persistence of high nighttime temperatures that will keep the mercury above 26°C for four consecutive days, compromising sleep quality and accumulating physical exhaustion among residents.

Monday: The start of intense heat in Buenos Aires

Monday, February 2, marks the beginning of this thermally aggressive period. The day will start with a low of 23°C and mostly clear skies, accompanied by moderate northward winds. From midday, high clouds will allow solar radiation to penetrate without significant obstacles, pushing temperatures up to 34°C in a sweltering afternoon.

Monday night will be particularly warm, with lows around 29°C due to sustained tropical air circulation. Just after midnight, there will be a slight temperature drop, allowing somewhat more tolerable sleeping conditions. This will be the first day in a series where rest will be compromised by persistent heat.

Tuesday: Extreme temperatures and the thermal breaking point

Tuesday, February 3, will be the most intense day of the week, with maximum temperatures reaching 36°C. It will start with a low of 24°C and partly cloudy skies, but as the morning progresses, atmospheric instability will increase with southeast winds favoring the formation of mid-level clouds.

The peak of heat will occur in the afternoon, with the thermometer climbing relentlessly under an unforgiving sun. Although isolated showers are possible, they will be insufficient to provide significant relief. The night will close with 28°C, still very high but with cooler air circulation from the east offering a slight respite compared to the previous day.

Wednesday: First break in a series of extreme days

Wednesday, February 4, will bring the first notable thermal easing of the week. Without significant cold air drops, but with increased cloud cover partially shading the sun, highs will drop to 31°C. This figure, while still high, will be a relief compared to the previous days.

The morning will start at 24°C with easterly winds. During the day, cloudiness will intensify, limiting solar radiation and allowing air to circulate more freely. The night will see a significant thermal decrease with lows of 26°C, although the persistence of mild winds will keep temperatures relatively high throughout the early morning hours.

Thursday: Return of extreme heat and threat of nocturnal storms

Thursday, February 5, marks the return of the summer heat offensive. Summer will regain ground with a day dominated by warm winds from the early hours. The morning will start at 25°C with mostly cloudy skies, though moderate northeast winds will not prevent temperatures from rising.

In the afternoon, the mercury will climb again to 34°C, almost replicating Monday’s conditions with less cloud cover. By night, the arrival of a weak cold front signals the upcoming climate change. There is a risk of isolated storms before midnight, when the cooling process will finally begin. The night will end with 29°C.

Friday: Relief arrives with scarce rainfall

Friday, February 6, marks the desired turning point. After days of suffocating heat, the first precipitation of the week will arrive, although weather models warn of very poor accumulations that will disappoint those expecting significant downpours.

The day will start with instability, a low of 24°C, and cloudy skies, accompanied by moderate southeast winds bringing cooler air from the river. Highs will be around 30°C, contained by rain, persistent cloud cover, and river breezes. Although relative humidity will remain high, creating a perceived temperature higher than the thermometer indicates, this day will be a notable relief compared to the previous days. The night will be considerably more comfortable with lows of 23°C.

Weekend: Consolidation of thermal improvement

Saturday, February 7, will maintain the thermal calm achieved on Friday, with lows of 22°C and highs of 30°C under a sunny afternoon. Sunday, February 8, may see a slight increase in temperatures, but a new cold air intrusion before sunset will bring additional rainfall and a temperature drop that will definitively end this episode of extreme heat.

Overall analysis: The longest-lasting heatwave of the season

This third heatwave is shaping up to be the longest in the summer of 2025-2026 in the AMBA. While previous episodes were characterized by extreme maximum temperatures, this event stands out for its overall thermal persistence, especially during nighttime hours.

The critical factor is not only the peak temperatures (with Tuesday reaching 36°C) but also the consistently high minimums over four consecutive days. Nighttime temperatures between 26 and 29°C prevent effective rest and accumulate physiological fatigue among the population.

For those working outdoors, especially during daytime shifts, Tuesday and Thursday will pose the greatest challenges. Precautions should be taken: stay constantly hydrated, seek shade regularly, and avoid sun exposure between 12 and 4 p.m. when radiation is most intense.

The arrival of the cold front on Friday, although with modest rainfall, will bring the much-needed relief. By the weekend, conditions will normalize significantly, offering respite after a particularly demanding week for the health and well-being of AMBA residents.