The autumn and spring are characterized by fluctuating temperatures and quickly changing weather. [32] With a mean precipitation of 384.8 mm (15.15 in), it is the rainiest season. The city is hot and humid during the summer months of December to March, with temperatures in the low to mid-80s (about 28 °C). [48] Warm, humid air penetrates the city, higher solar radiation and frequent synoptic weather disturbances from the west occur during the end of the winter. [6] Although it is polar maritime (this is a cool, moist air mass that forms from oceans located in the subantarctic and antarctic regions at the southern tip of South America), it becomes modified as it passes over the South American continent, becoming drier as it arrives at Buenos Aires. At the central observatory,[note 1] the highest recorded temperature is 43.3 °C (109.9 °F) while the lowest recorded temperature is −5.4 °C (22.3 °F). [40] The greatest risk for tornadoes occurs in the summer season due to the favourable conditions. While nights do cool off considerably during the summer, it won’t hurt to do like the locals and chug lemonade or buy a big cone of ice cream. Thanks to its proximity to the Rio de la Plata, it has moderate temperatures most of the year. [42] Periods of rainy weather occur although these are usually of short duration. [17] Because the Sudestada brings the highest wind speeds (particularly when these winds are combined with the astronomical tides), the Sudestada is responsible for floods that occur in low-lying areas. Winter in central part is mostly cold and summer heat is often accompanied by thunderstorms and tornadoes. [11] The Sudestada winds are formed when a high pressure system located in southern Argentina interacts with a low pressure system over Uruguay and southern Brazil. From June till August are … During this time tourism in Buenos Aires is at its peak and prices will be as well. The jacaranda trees’ neon violet boughs hang over the streets, and the humidity decreases to its lowest levels of the year. Spring and fall are transition seasons characterized by changeable weather. [5] The average high is 29.1 °C (84.4 °F) while the average low is 19.3 °C (66.7 °F). [23] The average heat island is in summer than in winter. Gloves are recommended but not essential. [24] In contrast, the urban heat island effect during nights is the most intense in January than in July. [32] This is due to hot temperatures and high insolation that lead to the development of a low pressure system called the Chaco Low situated over northern Argentina that interacts with the South Atlantic High to generate a pressure gradient that brings moist easterly winds to the region, favouring precipitation, which mostly occurs in the form of convective thunderstorms. [48], According to the central observatory, which has one of the most reliable and oldest records in South America,[2] the highest temperature in Buenos Aires, 43.3 °C (109.9 °F), was recorded on 29 January 1957 while the lowest temperature recorded is −5.4 °C (22.3 °F) on 9 July 1918. The summer months in Buenos Aires last from December to February, this time of year can feel overbearingly hot and humid at times due to the lack of breeze. Buenos Aires and the Pampas have a temperate climate which means it' can be pretty cold in winter, but hot and humid in summer. Summer is the rainiest season in Buenos Aires, so expect showers with your sunshine. The is a great deal of rainfall in Buenos Aires, even in the driest month. [65] On the other hand, 1916 has been the driest year, with a mean annual precipitation of 504 mm (19.8 in). The coastal location results in a strong maritime influence, causing extreme temperatures (hot or cold) to be rare. [5] [50] The warmest year on record is 2017, with a mean annual temperature of 18.7 °C (65.7 °F) or 18.8 °C (65.8 °F). Flugh.) Some shorts, pants, T-shirts, and a light jacket or hoodie. [18][19][20][21] Flooding impacts the neighbourhoods La Boca and Barracas which are in the southern parts of the city, more low-lying and inhabited by poor people (of low socioeconomic status). [35][36] In extreme cases, these power shortages during heat waves can cause traffic jams and protests, such as the December 2013 heat wave (longest heat wave ever recorded in Buenos Aires)[37] where increased energy demand lead to energy shortages and power cuts, protests against the government over the lack of service, and traffic jams as a result of these protests. [3] In autumn and summer, it produces storms that are generally located north of the city and produces strong winds from the south or southeast that can occasionally lead to the swelling of the Río de la Plata, flooding coastal areas. [23] On average, Buenos Aires is warmer than the surrounding areas by 1.5 to 3.5 °C (2.7 to 6.3 °F) owing to the urban heat island. Daylight hours in summer range between thirteen hours per day in October to fourteen hours per day in November, December, January and February. [52], The year with the maximum precipitation was 1900, when the city received 2,024 mm (79.7 in) of precipitation. [15][16][17] Winters are cloudy while relative humidity is very high, often 90% or higher, making the weather dull, grey and cool. After months of cold and gray skies, temps began rising to the 60s and 70s Fahrenheit. Chance of rain 80%. Spring and fall are the best seasons to visit weather-wise, with balmy temperatures, plenty of sunshine, and plants exploding with colors in all barrios (neighborhoods) of the city. [2] This is due to the city center having higher temperatures than the surrounding areas owing to the urban heat island effect. [48][49] This is popularly known as the Santa Rosa Storm, around 30 August. I wouldn't be discouraged that it is their winter. Find out more about our data sources. January is the hottest month in Buenos Aires with an average temperature of 24.5°C (76°F) and the coldest is July at 11.5°C (53°F) with the most daily sunshine hours at 9 in February. While nights do cool off considerably during the summer, it won’t hurt to do like the locals and chug lemonade or buy a big cone of ice cream. [25][26] During an El Niño year, precipitation is higher,[26] with a significant increase in precipitation from November to January. There is also a wet season here from December to March when it can be uncomfortably humid. What to pack: Tank tops, shorts, or any light, reflective clothing. 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