Of course, it is unusual for residents of the northern hemisphere, but the "coldest" weather in Buenos Aires for a week is in June (this is the local winter).
If you choose to travel between June and August, bring warm clothes. During the day in these months the temperature is +11-12°C, and at night it drops to +8°C. Minus values are very rare here, although they do happen (up to -5°C). Snow is almost a fantasy, but it does happen, so before traveling, check the weather forecast for Buenos Aires for the next few days.
The hottest time is January, February. If you look at the Buenos Aires weather reports for 14 days in January, you will see that the average temperature is +25-30°C. At this time it is sweltering, plus heavy precipitation is likely.
Spring season reigns from September to December. For example, November weather in Buenos Aires for 5 days promises a comfortable +20°C. Autumn, and in Argentina is the time from March to May, the average temperature is +18°C. Approximately the same weather in Buenos Aires for 3 days is guaranteed in spring, with average temperatures ranging from +15°C in September to +20°C in November. Please note that spring and fall rains are common in the city, but they tend to be short-lived.
The tourist season in Argentina runs from October through May. But don't be too quick to say, "That's it, I'm only going to Buenos Aires in the 'high' season!".
In summer (December, January, February), for example, although it's sweltering, there are plenty of entertainment events, including the famous carnivals (that's when it's best to go to Buenos Aires!), so you won't be bored.
Winter is a good option for those looking for a cheaper time to travel to Buenos Aires (don't forget it's June-August).
