Buenos Aires weather in March
In March, Buenos Aires has daytime highs averaging 25 °C, nights around 18 °C, with 7.6 wet days, and a sea temperature of 23 °C. Figures are 1991–2020 climate normals.
- 24.6°C Average high
- 18.3°C Average low
- 7.6days Wet days
- 100mm Rainfall
- 23.4°C Sea temperature
- 12h Daylight
Daily temperatures through March
How March develops
Averages for the first, middle and last part of the month, from daily 1991–2020 normals. Chance of rain is the share of years in which that calendar day recorded more than 1 mm.
| Days | Avg high | Avg low | Chance of rain |
|---|---|---|---|
| 1–10 March | 25.8 °C | 19.5 °C | 25 % |
| 11–20 March | 24.6 °C | 18.4 °C | 25 % |
| 21–31 March | 23.5 °C | 17.0 °C | 23 % |
- Average highs fall from 25.8 °C early in March to 23.5 °C by the end of it.
What to expect
| Measure | Typical March | Share of the month |
|---|---|---|
| Days above 25 °C | 14 of 31 | 44 % |
| Days above 30 °C | 0.8 of 31 | 2 % |
| Days below 0 °C | 0 of 31 | 0 % |
| Days with more than 1 mm rain | 7.6 of 31 | 24 % |
Conditions in March
| Measure | Average |
|---|---|
| Mean temperature | 21 °C |
| Record high (1991–2020) | 34 °C |
| Record low (1991–2020) | 9.3 °C |
| Relative humidity | 74 % |
| Wind speed | 22 km/h |
| Cloud cover | 41 % |
Where Buenos Aires ranks in March
| Ranking | Position | Value |
|---|---|---|
| Places with the best weather in South America in March | 36thof 50 | 85/100 |
March compared with the months around it
| Month | Avg high | Rainfall | Cloud |
|---|---|---|---|
| January | 27.7 °C | 88 mm | 38 % |
| February | 26.5 °C | 98 mm | 40 % |
| March | 24.6 °C | 100 mm | 41 % |
| April | 21.0 °C | 104 mm | 47 % |
| May | 17.3 °C | 76 mm | 55 % |
See all twelve months for Buenos Aires
- March is the 4th warmest month here.
- It is the 10th driest month of the year.
- It ranks 4th for least cloud cover.
- Days last about 12 hours from sunrise to sunset.
- It rains on 7.6 of 31 days — 24 % of the month.
- Nights are about 6.3 °C cooler than the middle of the day.
- The hottest March day on record since 1991 reached 34 °C, 8.9 °C above the usual daytime high.
- Beach score: 84 / 100 — see how this is calculated.
Nearby destinations in March
| Destination | Avg high | Wet days | Sea |
|---|---|---|---|
| Buenos Aires | 25 °C | 7.6 | 23 |
| Avellaneda | 25 °C | 7 | 23 |
| Merlo | 26 °C | 7 | – |
QuestionsMarch in Buenos Aires, answered
How warm is Buenos Aires in March?
Daily highs average 25 °C and nights fall to about 18 °C, a spread of 6.3 °C between afternoon and dawn. That makes March the 4th warmest month of the year here.
Does it rain much in Buenos Aires in March?
March averages 100 mm of rain, spread over about 8 of the 31 days — 24 % of the month. Cloud cover averages 41 % of the sky.
Is the sea warm enough to swim in March?
The sea averages 23 °C off Buenos Aires in March. Most people find water below 20 °C bracing and above 25 °C comfortable for a long swim; this figure is a monthly surface average, so a sheltered bay on a still afternoon can be warmer.
How long are the days in March?
Buenos Aires averages 12 hours between sunrise and sunset in March. Day length is computed from latitude and date, so it is exact rather than modelled — but it says nothing about how much of that time is sunny.
Data sources and method
- ERA5 / ERA5-Land reanalysis — Copernicus Climate Change Service (C3S), ECMWF. Copernicus Licence
- Open-Meteo — Open-Meteo.com. CC BY 4.0
- NOAA OISST v2.1 — NOAA Physical Sciences Laboratory. Public domain
- GeoNames — GeoNames.org. CC BY 4.0
- Normal period
- 1991–2020
- Dataset version
- era5-1991-2020-scores1.1
- Last processed
Measured values come from ERA5 reanalysis and are reproduced unchanged. Calculated by us: daylight hours, beach and comfort scores, monthly rankings, threshold day counts, chance of a wet day by date, ten-day averages within the month. Full formulas are on the methodology page.
Contains modified Copernicus Climate Change Service information 2026. Neither the European Commission nor ECMWF is responsible for any use that may be made of the Copernicus information or data it contains.