The highest day temperature in September 2026 was 76°F. The lowest night temperature was 39°F. The average values for day and night temperatures during September were 61.3°F и 51.5°F respectivly.

The average sea surface temperature in September 2026 for Buenos Aires was 62.4°F. The maximum and minimum values were 60.0°F and 66.4°F respectively.

Most of the days in September are sunny but you can also expect cloudy and gloomy days.

Precipitation total in September for Buenos Aires is 2.6 in.

The average wind speed in September is 10.5 mph. This value is relatively stable throughout the year.

We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for Buenos Aires in September is 8.0 hours.