December brings 28°C daytime highs, 103mm of precipitation across about 9 wet days and 14.3 hours of daylight — best for beach days, swimming and reliable sunshine. The strongest run of the year is November to January. March is the quietest month: quiet and local, and still good for beach days, swimming and quiet and local.
Long-run climate normals for Buenos Aires. Month ratings compare months within Buenos Aires only — they are not a ranking of Buenos Aires against other destinations, and they are not a forecast for a specific year.
Last updated: · Live forecast data refreshes hourly.
| Best month | December — Beach days, Swimming, Reliable sunshine |
| Best 3-month window | November–January |
| Quietest month | March — Quiet and local |
| Driest month | June — 50mm |
| Wettest month | March — 155mm |
| Warmest / coolest | January 30°C / August 15°C |
| Seasonality | Fairly even across the year |
| Annual rainfall | 1147mm over roughly 98 rain days |
March gets roughly 50% more precipitation than December — 155mm against 103mm. That difference, more than temperature, is what changes how a day here feels.
Daytime highs only move 15°C across the whole year (15–30°C), so timing matters far less here than rainfall does.
December gives you 14.3 hours of daylight against just 9.7 in June — a 5-hour difference in how much you can actually fit into a day.
June is the driest month at 50mm across roughly 4 wet days, while March peaks at 155mm.
May is almost as good as December, but usually quieter and cheaper. If your dates are flexible, it is the easier trip.
Buenos Aires stays fairly consistent all year, so there is no month you need to avoid. What you plan to do matters more than when you go.
Ratings compare months within Buenos Aires, not against destinations worldwide: five stars means the best time to be here, not that Buenos Aires beats anywhere else. Tags describe what the conditions actually suit.
| Month | Rating | High / Low | Precipitation | Wet days | Sun | Daylight | Best for |
|---|---|---|---|---|---|---|---|
| January | ★★★★☆ | 30°C / 21°C | 122mm | 10 | 11h | 14.1h | Beach days · Swimming · Reliable sunshine |
| February | ★★★★☆ | 30°C / 21°C | 123mm | 10 | 11h | 13.3h | Beach days · Swimming · Reliable sunshine |
| March | ★★☆☆☆ | 28°C / 19°C | 155mm | 13 | 5h | 12.2h | Beach days · Swimming · Quiet and local |
| April | ★★★☆☆ | 24°C / 16°C | 107mm | 9 | 4h | 11.1h | Hiking · Cycling · Low-angle light |
| May | ★★★★★ | 21°C / 12°C | 74mm | 6 | 6h | 10.2h | Hiking · Cycling · Low-angle light |
| June | ★★★★☆ | 17°C / 9°C | 50mm | 4 | 5h | 9.7h | Hiking · Cycling · Low-angle light |
| July | ★★★★☆ | 15°C / 7°C | 53mm | 5 | 8h | 9.9h | Hiking · Cycling · Low-angle light |
| August | ★★★★☆ | 15°C / 7°C | 63mm | 5 | 8h | 10.7h | Hiking · Cycling · Low-angle light |
| September | ★★★★☆ | 17°C / 9°C | 73mm | 6 | 5h | 11.8h | Hiking · Cycling · Spring greenery |
| October | ★★★★☆ | 21°C / 12°C | 119mm | 10 | 6h | 12.9h | Hiking · Cycling · Spring greenery |
| November | ★★★★☆ | 24°C / 16°C | 108mm | 9 | 4h | 13.8h | Hiking · Cycling |
| December | ★★★★★ | 28°C / 19°C | 103mm | 9 | 11h | 14.3h | Beach days · Swimming · Reliable sunshine |
| You are planning | Pick | Why |
|---|---|---|
| Sun & beach days | December | 11h daily sunshine, 28°C highs and only 9 rain days. |
| City walking & sightseeing | June | 17°C highs with 9.7h of daylight — long days without heat fatigue. |
| Photography & light | December | 11h of sun and 14.3h daylight give the widest window for golden-hour work. |
| Value & fewer crowds | January | Scores 70/100 — close to peak conditions but outside the busiest window. |
| Cooler-weather travel | June | 17°C highs and 9°C nights suit anyone who dislikes heat. |
Each month in Buenos Aires is described from long-run climate normals and then rated relative to the other eleven months in the same city. A five-star January in a cold destination means January is one of the best times to be there — not that it beats a Mediterranean summer.
| Factor | Weight | What it measures |
|---|---|---|
| Temperature | Described | Average daytime high and overnight low for the month, shown as measured rather than judged. |
| Precipitation | Described | Monthly millimetres and wet-day count, labelled as snow or rain/snow where temperatures make that the likely phase. |
| Sunshine & daylight | Described | Average daily sunshine hours and astronomical daylight length at mid-month, from the city’s latitude. |
| “Best for” tags | Derived | Applied only when the conditions genuinely support the activity — snow depth-friendly cold for skiing, 13–24°C and low rain risk for hiking, dark evenings at high latitude for aurora. A month with few strong use cases gets fewer tags rather than padded ones. |
| Star rating | Relative | Ranks the month against the other eleven months in the same city. Never a comparison between cities. |
Figures are long-run climate averages, not a forecast for a specific year. Where a month lacks sourced rainfall or humidity, the value is modelled from temperature range and rain frequency.
December is the best all-round month in Buenos Aires: 28°C highs, 103mm of precipitation and 14.3 hours of daylight, which suits beach days, swimming and reliable sunshine. The strongest three-month window is November to January.
March — 28°C highs, 155mm of precipitation over roughly 13 days and 12.2 hours of daylight. It is the cheapest and least crowded time to go, and it still works for beach days, swimming and quiet and local.
June is the driest month at 50mm over about 4 rain days, against 155mm in March. Across the year Buenos Aires records around 1147mm.
Yes — conditions in Buenos Aires stay fairly even all year, so there is no month you need to avoid. What you plan to do matters more than when you go.
Daylight ranges from 9.7 hours in June to 14.3 hours in December, calculated from the city's latitude.