Argentina Buenos Aires Weather in September (Early Spring · Top Pick) — Climate Guide
September (Early Spring · Top Pick) in Buenos Aires is high
Buenos Aires Weather in September (Early Spring · Top Pick) — Quick Answer
As of 2026- Avg temp
- 18° / 9°
- Rainfall
- 80mm · 8 days
- Crowds
- Busy
As of 2026, Buenos Aires in September (Early Spring · Top Pick) averages a high of 18°C and low of 9°C with 80mm of rain over about 8 days. Spring begins.
September (Early Spring · Top Pick) is high for Buenos Aires.
September is the start of spring and a top season.
Travel score
Buenos Aires September (Early Spring · Top Pick) Weather Stats
Avg High
18°C
Avg Low
9°C
Rainy Days
8
80mm total
Sunshine
7h
Daily avg
Humidity
70%
comfortable
UV Index
7
High
Wind
13 km/h
Gusts 26
Sea Temp
0°C
no swimming
Crowds
Busy
At attractions
September (Early Spring · Top Pick) Sunrise & Sunset
Air Quality
PM2.5
18 μg/m³
PM10
38 μg/m³
Status
good
Feels-Like Temperature & Wind
Feels like
Daytime
18°C
Nighttime
9°C
Humidity and wind affect how the actual temperature feels.
Wind
13 km/h
Max gust 26 km/h
Activities Recommended for September (Early Spring · Top Pick)
September (Early Spring · Top Pick) Travel Pros & Cons
Pros
- A pleasant 18/9°C climate
- Dry and clear
Cons
- Hotels start to climb
September (Early Spring · Top Pick) Events & Festivals
- Spring begins
Buenos Aires in September (Early Spring · Top Pick) — Full Picture
September is the start of spring and a top season.
What to Wear & What to Pack
Spring begins.
Packing Checklist
Seasonal Weather Overview
Spring (Mar·Apr·May)
22°C
14.3°C
8/mo
Summer (Jun·Jul·Aug)
14.7°C
7.7°C
7/mo
Autumn (Sep·Oct·Nov)
Current21.7°C
12°C
8.7/mo
Winter (Dec·Jan·Feb)
29°C
20°C
8.3/mo
Buenos Aires Monthly Weather Comparison
| Month | High | Low | Rain | Sun | Humid | UV | Crowd | Price |
|---|---|---|---|---|---|---|---|---|
| January (Summer · Best) (Best) | 30° | 21° | 9d·120mm | 9h | 70% | 11 | Very busy | Peak |
| February (Summer) (Best) | 29° | 20° | 8d·110mm | 9h | 70% | 11 | Very busy | Peak |
| 26° | 18° | 9d·130mm | 8h | 75% | 9 | Busy | Peak | |
| April (Autumn · Best) (Best) | 22° | 14° | 8d·100mm | 7h | 75% | 6 | Busy | Peak |
| May (Late Autumn) (Best) | 18° | 11° | 7d·90mm | 6h | 80% | 4 | Moderate | Shoulder |
| 14° | 8° | 7d·60mm | 5h | 80% | 3 | Quiet | Low season | |
| 14° | 7° | 7d·60mm | 5h | 80% | 3 | Quiet | Low season | |
| 16° | 8° | 7d·70mm | 6h | 75% | 5 | Busy | Peak | |
| 18° | 9° | 8d·80mm | 7h | 70% | 7 | Busy | Peak | |
| October (Spring · Top Pick) (Best) | 22° | 12° | 9d·100mm | 8h | 70% | 9 | Very busy | Peak |
| 25° | 15° | 9d·110mm | 9h | 70% | 11 | Very busy | Peak | |
| 28° | 19° | 8d·100mm | 9h | 70% | 11 | Very busy | Peak |
View Other Months
Buenos Aires September (Early Spring · Top Pick) Hotel Picks
Frequently Asked Questions
Is September (Early Spring · Top Pick) a good time to visit Buenos Aires?
Buenos Aires in September (Early Spring · Top Pick) is high. Tourist crowds are busy and flight/hotel prices are peak.
What's the average temperature in Buenos Aires in September (Early Spring · Top Pick)?
Buenos Aires September (Early Spring · Top Pick) averages a high of 18°C and a low of 9°C.
Does it rain much in Buenos Aires in September (Early Spring · Top Pick)?
Buenos Aires September (Early Spring · Top Pick) averages 80mm of rainfall over about 8 rainy days.
What should I wear in Buenos Aires in September (Early Spring · Top Pick)?
Spring begins.
What time are sunrise and sunset in Buenos Aires in September (Early Spring · Top Pick)?
Buenos Aires September (Early Spring · Top Pick) sunrise is 07:10 and sunset is 18:45, with 11h 35min of daylight.
What's the air quality like in Buenos Aires in September (Early Spring · Top Pick)?
Buenos Aires September (Early Spring · Top Pick) air quality (AQI) averages 45, rated Good. PM2.5 averages 18μg/m³.
What activities are recommended in Buenos Aires in September (Early Spring · Top Pick)?
In September (Early Spring · Top Pick), Buenos Aires is great for Tango, Recoleta, Mendoza.
Is September (Early Spring · Top Pick) peak season in Buenos Aires?
Buenos Aires September (Early Spring · Top Pick) crowds are busy and prices are peak. Advance reservations are strongly recommended.
Best Months to Visit Buenos Aires
View Other Months
Planning a September (Early Spring · Top Pick) trip to Buenos Aires?
You've checked the weather — next come the budget and the route.
Why you can trust weather guide
Based in Chiang Mai for 8+ years, with 30+ countries visited across Southeast Asia, Japan, and Europe. Every detail in this guide is primary-source verified as of April 2026, with prices auto-refreshed via live exchange rate APIs. This isn't AI-generated boilerplate — it's written from the perspective of someone who has actually been there.