Buenos Aires weather in September 2025

Expect 19°C daytime maximum temperatures in the shade with on average 6 hours of sunshine per day in Buenos Aires in September. Check more long-term weather averages for Buenos Aires in September before you book your next holiday to Argentina in 2025/2026.

  • 19°C maximum daytime temperature in September in Buenos Aires19
    19°C max day temperature
  • 6 hours of sunshine per day
  • 7 days with some rainfall in September in Buenos Aires7
    7 days with some rainfall
  • 10°C minimum night-time temperature in September in Buenos Aires10
    10°C min night temperature
  • 12 hours of daylight per day in September in Buenos Aires12
    12 hours of daylight per day
  • No heat & humidity in September in Buenos Aires0
    No heat & humidity
  • 69 mm monthly rainfall in September in Buenos Aires69
    69 mm of monthly rainfall
  • UV (maximum) index 6 (High) in September in Buenos Aires6
    6 (High) UV index
  • 15°C sea temperature in September in Buenos Aires15
    15°C sea temperature

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The September weather guide for Argentina (Buenos Aires) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Metric (°C / mm)  |  Imperial (°F / inches)

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More about Buenos Aires

How hot is it in Buenos Aires in September?

Daytime temperatures usually reach 19°C in Buenos Aires in September, falling to 10°C at night.

How sunny is it in Buenos Aires in September?

There are normally 6 hours of bright sunshine each day in Buenos Aires in September - that's 54% of daylight hours.

How warm is the sea around Buenos Aires in September?

The average sea temperature around Buenos Aires in September is 15°C.

Does it rain in Buenos Aires in September?

There are usually 7 days with some rain in Buenos Aires in September and the average monthly rainfall is 69mm.

Buenos Aires September sunrise & sunset times

Browse the sunrise and sunset times for Buenos Aires in September 2025. Select a month to view Buenos Aires sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 07:12 18:35
Monday, 15th September 2025 06:53 18:45
Tuesday, 30th September 2025 06:31 18:56

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