What to expect in Buenos Aires in September
September is a strong choice for Buenos Aires: 18° / 9°, with manageable crowds at the big attractions and prices close to the yearly average.
Buenos Aires weather in September
Typical conditions in Buenos Aires during September, based on long-run climate normals rather than any single year. Treat it as a planning guide, not a forecast.
| Average high | 18°C 64°F |
|---|---|
| Average low | 9°C 48°F |
| Rainfall | Moderate 40/100 |
| Total rainfall | 72 mm2.8 in |
| Rainy days | 7 |
| Daylight | 11 h 52 min |
| How it feels | Mild — layers weather |
Average highs sit around 18°C with lows near 9°C. Rainfall is moderate; the odd shower is likely.
Crowds & demand
Crowd levels are Moderate for Buenos Aires — manageable crowds at the big attractions.
Prices & value
This month counts as shoulder season: prices close to the yearly average.
What to pack
Layers you can shed: 18°C by day and about 9°C after dark is a two-jacket kind of month.
What it costs
Costs in September sit around the yearly average for Buenos Aires — neither a bargain nor a squeeze. Booking a few weeks out is usually enough. Compared with the most expensive month of the year, you are looking at roughly 31% less.
Who this month suits
- Travellers who want the most reliable weather
- Anyone travelling on a budget
- People who would rather have space than perfect conditions
Events & what’s on
No major festivals fall in September, so the destination feels like its everyday self.
Buenos Aires in September compared with nearby months
If your dates are flexible by a few weeks, this is what shifting them actually buys you.
| Month | Temp | Crowds | Price | Score |
|---|---|---|---|---|
| July | 14° / 6° | Low | $ | 62 |
| August | 16° / 7° | Moderate | $ | 62 |
| September · This month | 18° / 9° | Moderate | $$ | 61 |
| October | 21° / 11° | Moderate | $$ | 59 |
| November | 24° / 14° | Moderate | $$ | 60 |
These months score higher for Buenos Aires on the same blend of weather, crowds and price. Same destination, better odds.
Or go somewhere else in September
If the destination is negotiable but the month is not, these places are at their best in September.
Figures are climate normals and modelled estimates — a planning guide, not a forecast. We separate fact, estimate and recommendation. Updated October 2026
