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Buenos Aires weather by month
Historical averages 2016–2025 · not a forecast
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When is the best time to visit Buenos Aires?
For a warm holiday, the best week has been 4–10 January (Weather Index 96). Favourable start dates for a 7-day trip run from 30 December to 9 January. January is warmest (28°C), August is driest and January, November and December have the most sun.
- Warmest
- January 28°C
- Coolest
- July 14°C
- Driest
- August 17% rain-day chance
- Wettest
- March and April 28% rain-day chance
- Sunniest
- January, November and December 12 hours a day
A rain day has 1 mm or more, snow included, so a short shower counts. Monthly averages below give the amounts.
Monthly averages in Buenos Aires
Buenos Aires historical monthly estimates, 2016–2025. Temperatures and sunshine are daily averages.
| Month | High (°C) | Low (°C) | Rain-day chance (%) | Expected rain days | Precipitation (mm/month) | Sunshine (hours/day) |
|---|---|---|---|---|---|---|
| January | 28.0 | 21.3 | 22.9 | 7.1 | 63.6 | 12.5 |
| February | 27.4 | 20.6 | 27.1 | 7.6 | 86.7 | 11.4 |
| March | 25.0 | 18.8 | 28.1 | 8.7 | 108.6 | 10.3 |
| April | 21.4 | 15.5 | 27.7 | 8.3 | 102.2 | 8.6 |
| May | 17.3 | 11.7 | 22.3 | 6.9 | 68.0 | 7.8 |
| June | 14.7 | 8.8 | 20.3 | 6.1 | 43.6 | 7.6 |
| July | 13.8 | 8.2 | 24.2 | 7.5 | 60.7 | 7.5 |
| August | 15.8 | 9.3 | 16.8 | 5.2 | 58.9 | 8.6 |
| September | 17.8 | 11.5 | 19.7 | 5.9 | 65.5 | 9.3 |
| October | 20.6 | 13.9 | 27.1 | 8.4 | 84.1 | 10.5 |
| November | 24.1 | 16.9 | 26.3 | 7.9 | 78.1 | 11.6 |
| December | 26.6 | 19.2 | 24.5 | 7.6 | 76.6 | 12.5 |
Each month averages its own days. Precipitation includes snow. About the data
Sources
Open-Meteo · 1 Jan 2016 – 31 Dec 2025
- Open-Meteo Historical Weather API
- Local days, 2016–2025, every year weighted equally. Each weekly chart averages its own seven days, without smoothing.
- Shading shows the 10th–90th percentile of past days, not forecast confidence.
- A rain day has at least 1 mm, snow included. The last weekly period has eight days.
- Wind is the average daytime (10:00–18:00) maximum, not gusts. Daylight is calculated from latitude. Missing readings stay blank.
- Mugginess (dew point) comes from the original daily summaries, on UTC days.
- The live two-week forecast comes from the Open-Meteo Weather Forecast API. The Weather Index does not use it.