Verdict: Excellent month
Buenos Aires Weather in September
September hits the sweet spot in Buenos Aires — highs around 18°C (64°F), ideal for a full day on foot. Rain is occasional — about 6 wet days in a typical year. Overall, September is one of the best months of the year to be in Buenos Aires.
Average high
18°C / 64°F
Average low
11°C / 52°F
Rain days
~6
Precipitation
63 mm
What to pack for Buenos Aires in September
- Layers — t-shirts under a light jacket or sweater
- Comfortable walking shoes — every guide on this site assumes you'll use them
September against the rest of the year
Warmest in Buenos Aires: Jan (29°C / 84°F) · Coolest: Jul (14°C / 57°F) · Wettest: Mar (~9 rain days)
29°
21°
Jan
28°
20°
Feb
26°
19°
Mar
21°
15°
Apr
17°
10°
May
15°
8°
Jun
14°
7°
Jul
16°
9°
Aug
18°
11°
Sep
21°
13°
Oct
25°
17°
Nov
27°
19°
Dec
Daily highs / lows in °C · bars show rain days per month · ERA5 climate normals (2020–2024)