Buenos Aires Weather in September
Average highs run from 19°C on September 1 to 21°C on September 30, and lows from 7°C to 9°C. Normal precipitation for the month is 72 mm over about 6 wet days.
September day by day
The normal high and low for each date, and the record, in °C.
- Normal low
- Normal high
- Record high
- Record low
September at a glance
- Average high
- 20°C
- Average low
- 8°C
- Precipitation
- 72 mm
- Record high
- 31°CSep 26, 2019
- Record low
- 0°CSep 13, 1976
- Daylight
- 11 h 23 min to 12 h 24 min
- Cloud cover
- 55%
- Humidity
- 76%
- Dew point
- 9°C
- Wind
- 15.8 km/h
Every day of the month
A wet day has at least 1 mm of precipitation in the reanalysis.
| Date | Normal high | Normal low | Record high | Record low | Chance wet |
|---|---|---|---|---|---|
| Sep 1 | 19°C | 7°C | 25°C 2015 | 1°C 2014 | 25% |
| Sep 2 | 19°C | 7°C | 23°C 2013 | 2°C 1974 | 25% |
| Sep 3 | 19°C | 7°C | 25°C 2012 | 4°C 2019 | 25% |
| Sep 4 | 19°C | 7°C | 21°C 2024 | 4°C 2006 | 24% |
| Sep 5 | 19°C | 7°C | 26°C 2004 | 2°C 1980 | 24% |
| Sep 6 | 19°C | 7°C | 26°C 1991 | 6°C 1996 | 24% |
| Sep 7 | 19°C | 7°C | 27°C 1995 | 4°C 1973 | 23% |
| Sep 8 | 19°C | 7°C | 27°C 2002 | 6°C 1996 | 22% |
| Sep 9 | 19°C | 7°C | 28°C 1981 | 5°C 2009 | 22% |
| Sep 10 | 19°C | 7°C | 25°C 2007 | 4°C 1976 | 22% |
| Sep 11 | 19°C | 7°C | 30°C 2013 | 4°C 2005 | 22% |
| Sep 12 | 20°C | 7°C | 26°C 2013 | 4°C 2005 | 22% |
| Sep 13 | 20°C | 7°C | 27°C 2011 | 0°C 1976 | 21% |
| Sep 14 | 20°C | 7°C | 24°C 1988 | 7°C 1988 | 20% |
| Sep 15 | 20°C | 8°C | 24°C 1996 | 4°C 1981 | 19% |
| Sep 16 | 20°C | 8°C | 27°C 2015 | 3°C 1980 | 20% |
| Sep 17 | 20°C | 8°C | 27°C 2023 | 5°C 1979 | 20% |
| Sep 18 | 20°C | 8°C | 26°C 2020 | 6°C 2013 | 20% |
| Sep 19 | 20°C | 8°C | 26°C 1999 | 7°C 1987 | 20% |
| Sep 20 | 20°C | 8°C | 26°C 1979 | 6°C 1995 | 22% |
| Sep 21 | 20°C | 8°C | 26°C 2017 | 7°C 2003 | 23% |
| Sep 22 | 20°C | 8°C | 24°C 2019 | 6°C 1984 | 23% |
| Sep 23 | 20°C | 8°C | 30°C 2018 | 0°C 1977 | 24% |
| Sep 24 | 20°C | 8°C | 24°C 1979 | 7°C 2000 | 26% |
| Sep 25 | 21°C | 8°C | 26°C 2004 | 5°C 2000 | 27% |
| Sep 26 | 20°C | 8°C | 31°C 2019 | 5°C 1992 | 28% |
| Sep 27 | 21°C | 9°C | 25°C 2011 | 7°C 1973 | 30% |
| Sep 28 | 21°C | 9°C | 23°C 1993 | 3°C 2009 | 30% |
| Sep 29 | 21°C | 9°C | 26°C 2007 | 5°C 2009 | 31% |
| Sep 30 | 21°C | 9°C | 23°C 2011 | 7°C 2013 | 32% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (GMT-3).
- September 1
- sunrise 7:12 AM, sunset 6:35 PM
- September 30
- sunrise 6:32 AM, sunset 6:56 PM
Other months
Sources
Records: NOAA GHCN-Daily, station ARM00087582, every year on file, quality-flagged values removed. Cloud, humidity, wind and sunshine, and temperature and precipitation: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-24. Sun and moon: computed with the NOAA solar equations and Meeus.