Mariano Roque Alonso Weather in September
Average highs run from 29°C on September 1 to 30°C on September 30, and lows from 15°C to 17°C. Normal precipitation for the month is 78 mm over about 9 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
- 30°C
- Average low
- 16°C
- Precipitation
- 78 mm
- Record high
- 42°CSep 27, 2020
- Record low
- 3°CSep 2, 2002
- Daylight
- 11 h 37 min to 12 h 18 min
- Cloud cover
- 53%
- Humidity
- 64%
- Dew point
- 14°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 | 29°C | 15°C | 37°C 1999 | 6°C 2011 | 19% |
| Sep 2 | 29°C | 15°C | 36°C 1995 | 3°C 2002 | 19% |
| Sep 3 | 29°C | 15°C | 37°C 2021 | 4°C 2002 | 18% |
| Sep 4 | 29°C | 15°C | 38°C 2004 | 7°C 2006 | 18% |
| Sep 5 | 29°C | 15°C | 37°C 2004 | 4°C 2006 | 19% |
| Sep 6 | 29°C | 15°C | 38°C 2003 | 3°C 2006 | 21% |
| Sep 7 | 29°C | 15°C | 38°C 2003 | 4°C 2008 | 22% |
| Sep 8 | 29°C | 15°C | 38°C 2004 | 6°C 2016 | 23% |
| Sep 9 | 29°C | 15°C | 38°C 2022 | 6°C 1974 | 23% |
| Sep 10 | 29°C | 15°C | 38°C 2007 | 5°C 1996 | 22% |
| Sep 11 | 29°C | 15°C | 37°C 2008 | 7°C 1996 | 23% |
| Sep 12 | 29°C | 16°C | 36°C 1995 | 6°C 2003 | 25% |
| Sep 13 | 30°C | 16°C | 37°C 2016 | 7°C 1983 | 25% |
| Sep 14 | 30°C | 16°C | 39°C 2021 | 4°C 1990 | 26% |
| Sep 15 | 30°C | 16°C | 38°C 2007 | 5°C 1990 | 26% |
| Sep 16 | 30°C | 16°C | 34°C 2009 | 4°C 1980 | 26% |
| Sep 17 | 30°C | 16°C | 40°C 2012 | 3°C 2001 | 28% |
| Sep 18 | 30°C | 16°C | 39°C 2012 | 5°C 1980 | 29% |
| Sep 19 | 30°C | 16°C | 36°C 2023 | 8°C 2005 | 29% |
| Sep 20 | 30°C | 16°C | 37°C 2024 | 5°C 1995 | 29% |
| Sep 21 | 30°C | 16°C | 36°C 2017 | 5°C 2002 | 29% |
| Sep 22 | 30°C | 16°C | 39°C 1988 | 7°C 1998 | 29% |
| Sep 23 | 30°C | 16°C | 38°C 2015 | 7°C 1980 | 30% |
| Sep 24 | 30°C | 16°C | 40°C 2003 | 4°C 2013 | 32% |
| Sep 25 | 30°C | 17°C | 40°C 2023 | 8°C 2007 | 33% |
| Sep 26 | 30°C | 17°C | 38°C 2023 | 7°C 2000 | 33% |
| Sep 27 | 30°C | 17°C | 42°C 2020 | 10°C 1992 | 32% |
| Sep 28 | 30°C | 17°C | 35°C 2020 | 7°C 1984 | 33% |
| Sep 29 | 30°C | 17°C | 38°C 1999 | 7°C 1984 | 34% |
| Sep 30 | 30°C | 17°C | 37°C 2002 | 4°C 1973 | 35% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (GMT-3).
- September 1
- sunrise 7:02 AM, sunset 6:39 PM
- September 30
- sunrise 6:31 AM, sunset 6:49 PM
Other months
Sources
Records: NOAA GHCN-Daily, station PAM00086218, 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 2026-09-25. Sun and moon: computed with the NOAA solar equations and Meeus.