Buenos Aires Observatorio weather by month
Averages and records for each calendar month at Buenos Aires Observatorio, Argentina, from 1908 to 2026. The warmest month is January, averaging 29.9°C; the coolest is July at 15.1°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 29.9°C | 19.0°C | 43.3°C29 January 1957 | 5.9°C17 January 1924 | 103 / 110 |
| February | 28.7°C | 18.4°C | 38.7°C13 February 1944 | 4.2°C20 February 1910 | 103 / 110 |
| March | 26.5°C | 16.5°C | 38.9°C12 March 2023 | 2.8°C30 March 1964 | 102 / 110 |
| April | 22.5°C | 12.9°C | 34.3°C4 April 2004 | −2.3°C26 April 1922 | 102 / 109 |
| May | 18.9°C | 9.9°C | 31.0°C15 May 1935 | −2.4°C20 May 1909 | 102 / 109 |
| June | 15.5°C | 7.1°C | 28.5°C14 June 1951 | −5.3°C14 June 1967 | 101 / 108 |
| July | 15.1°C | 6.7°C | 30.2°C29 July 1979 | −5.4°C9 July 1918 | 100 / 108 |
| August | 16.9°C | 7.7°C | 33.7°C24 August 1996 | −4.0°C8 August 1948 | 102 / 108 |
| September | 18.9°C | 9.5°C | 35.3°C11 September 2013 | −2.4°C14 September 1925 | 103 / 110 |
| October | 21.8°C | 12.1°C | 36.3°C27 October 2021 | −2.0°C2 October 1911 | 103 / 110 |
| November | 25.2°C | 14.8°C | 36.8°C27 November 1955 | 1.6°C4 November 1914 | 103 / 110 |
| December | 28.2°C | 17.4°C | 41.5°C14 December 2024 | 3.7°C8 December 1923 | 103 / 110 |
Years shows the number behind the average high, then the number holding a record for that month. They differ because a year contributes an average only when the month has at least 25 days of readings, while a single reading is enough to set a record. The average low is withheld on the same 25-day rule and is counted separately again; it is shown as a dash where the archive cannot support it. Across the twelve months here the averages rest on 100 to 103 years each.
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Every figure on this page is computed from Meteostat and its data providers observations stored per station, per year, per month. Nothing is modelled, interpolated or estimated, and a month the archive never covered is left out rather than filled in. A station appears here only once all twelve months carry an average from at least 10 years. See how this is built.