Buenos Aires records about 1147mm of rain across roughly 98 wet days a year, which is a 27% chance on an average day. March is the wettest month at 155mm (14% of the annual total) and June the driest at 50mm. Local rain type: thunderstorms. Always carry one — Buenos Aires thunderstorms are sudden and dramatic, especially in summer (December-March). A compact umbrella and waterproof phone case are essential.
Chance of rain on an average day: 27%
Rainfall climatology for Buenos Aires. The live hour-by-hour answer for today loads at the top of this page from Open-Meteo and refreshes through the day — the figures below describe a typical year, not today.
Last updated: · Live forecast data refreshes hourly.
| Annual rainfall | 1147mm |
| Rain days per year | 98 |
| Odds on an average day | 27% |
| Wettest month | March — 155mm over 13 days |
| Driest month | June — 50mm over 4 days |
| Rain type | thunderstorms |
| Best dry window | June and July (winter) bring the least rainfall with cool, crisp conditions. |
| Worst rain window | February and March bring the heaviest summer storms with high humidity. |
March delivers 210% more rain than June (155mm vs 50mm). That gap is the difference between planning around showers and ignoring them.
No single month holds more than 14% of the annual total, so rain in Buenos Aires is spread through the year — there is no season you can rely on being dry.
Buenos Aires rain arrives in short, heavy bursts — shelter and timing matter more than gear.
Rain falls on about 13 days in March against 4 in June — the frequency swing matters more for planning than the millimetre totals.
Climate normals. Use them to judge whether today's live forecast at the top of the page is typical or unusual for the season.
| Month | Rainfall | Rain days | Chance on a given day | Highs |
|---|---|---|---|---|
| January | 122mm | 10 | 33% | 30°C |
| February | 123mm | 10 | 33% | 30°C |
| March | 155mm | 13 | 43% | 28°C |
| April | 107mm | 9 | 30% | 24°C |
| May | 74mm | 6 | 20% | 21°C |
| June | 50mm | 4 | 13% | 17°C |
| July | 53mm | 5 | 17% | 15°C |
| August | 63mm | 5 | 17% | 15°C |
| September | 73mm | 6 | 20% | 17°C |
| October | 119mm | 10 | 33% | 21°C |
| November | 108mm | 9 | 30% | 24°C |
| December | 103mm | 9 | 30% | 28°C |
Rain probability is the chance that at least 0.2mm falls at your location — not how long it rains. For Buenos Aires we combine the hourly probability curve, expected volume in millimetres, and the city's own rainfall record into a single umbrella verdict.
| Factor | Weight | What it measures |
|---|---|---|
| Hourly probability | 40% | Peak and sustained chance of measurable rain across the next 24 hours. |
| Expected volume | 30% | Total millimetres, which separates a passing shower from a genuine soaking. |
| Timing & duration | 20% | When rain starts, when it eases, and the longest continuous dry window. |
| Local rain type | 10% | Drizzle, brief showers, thunderstorms or monsoon — each needs different gear. |
Live hourly values come from Open-Meteo and refresh through the day. Monthly rainfall figures are climate normals, so they describe a typical year rather than a forecast.
Buenos Aires records rain on roughly 98 days a year — about a 27% chance on any given day — totalling around 1147mm.
March, with about 155mm over 13 rain days. That is 14% of the entire year's rainfall in a single month.
June is the driest month at 50mm across roughly 4 days. June and July (winter) bring the least rainfall with cool, crisp conditions.
Always carry one — Buenos Aires thunderstorms are sudden and dramatic, especially in summer (December-March). A compact umbrella and waterproof phone case are essential.
No. Probability is the chance that at least 0.2mm of rain falls at your location at some point in the period. Check the expected millimetres alongside it: 40% with 0.4mm is a passing shower, 40% with 12mm is a soaking.