São Luís Weather in September
Average highs run from 32°C on September 1 to 32°C on September 30, and lows from 25°C to 25°C. Normal precipitation for the month is 18 mm over about 3 wet days.
September day by day
The normal high and low for each date, in °C.
- Normal low
- Normal high
- Reanalysis extreme high
- Reanalysis extreme low
September at a glance
- Average high
- 32°C
- Average low
- 25°C
- Precipitation
- 18 mm
- Reanalysis high
- 35°CSep 9, 2012
- Reanalysis low
- 23°CSep 19, 1995
- Daylight
- 12 h 04 min to 12 h 08 min
- Cloud cover
- 28%
- Humidity
- 73%
- Dew point
- 22°C
- Wind
- 10.4 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 | Reanalysis high | Reanalysis low | Chance wet |
|---|---|---|---|---|---|
| Sep 1 | 32°C | 25°C | 34°C 2020 | 24°C 2000 | 13% |
| Sep 2 | 32°C | 25°C | 33°C 2016 | 24°C 2000 | 13% |
| Sep 3 | 32°C | 25°C | 33°C 2020 | 24°C 2000 | 12% |
| Sep 4 | 32°C | 25°C | 33°C 2017 | 24°C 2000 | 11% |
| Sep 5 | 32°C | 25°C | 33°C 2012 | 24°C 1996 | 11% |
| Sep 6 | 32°C | 25°C | 33°C 2017 | 24°C 1996 | 11% |
| Sep 7 | 32°C | 25°C | 33°C 2003 | 24°C 2002 | 11% |
| Sep 8 | 32°C | 25°C | 33°C 2012 | 24°C 1991 | 12% |
| Sep 9 | 32°C | 25°C | 35°C 2012 | 24°C 2006 | 11% |
| Sep 10 | 32°C | 25°C | 34°C 2012 | 24°C 2006 | 11% |
| Sep 11 | 32°C | 25°C | 34°C 2010 | 24°C 2006 | 12% |
| Sep 12 | 32°C | 25°C | 34°C 2007 | 24°C 1997 | 11% |
| Sep 13 | 32°C | 25°C | 34°C 2017 | 24°C 2005 | 11% |
| Sep 14 | 32°C | 25°C | 34°C 2017 | 24°C 2006 | 11% |
| Sep 15 | 32°C | 25°C | 35°C 2017 | 24°C 2011 | 10% |
| Sep 16 | 32°C | 25°C | 34°C 2017 | 24°C 2001 | 9% |
| Sep 17 | 32°C | 25°C | 34°C 2018 | 24°C 2001 | 9% |
| Sep 18 | 32°C | 25°C | 34°C 2017 | 24°C 2001 | 9% |
| Sep 19 | 32°C | 25°C | 34°C 2017 | 23°C 1995 | 10% |
| Sep 20 | 32°C | 25°C | 34°C 2013 | 24°C 1995 | 10% |
| Sep 21 | 32°C | 25°C | 33°C 2011 | 24°C 1993 | 9% |
| Sep 22 | 32°C | 25°C | 34°C 2010 | 24°C 2006 | 9% |
| Sep 23 | 32°C | 25°C | 34°C 2013 | 24°C 2006 | 8% |
| Sep 24 | 32°C | 25°C | 33°C 2010 | 24°C 1993 | 8% |
| Sep 25 | 32°C | 25°C | 33°C 2011 | 24°C 2006 | 8% |
| Sep 26 | 32°C | 25°C | 33°C 1998 | 24°C 2002 | 7% |
| Sep 27 | 32°C | 25°C | 33°C 2014 | 24°C 1991 | 7% |
| Sep 28 | 32°C | 25°C | 34°C 2009 | 25°C 1991 | 8% |
| Sep 29 | 32°C | 25°C | 33°C 1998 | 24°C 2006 | 8% |
| Sep 30 | 32°C | 25°C | 33°C 2003 | 24°C 2001 | 8% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (GMT-3).
- September 1
- sunrise 5:55 AM, sunset 5:59 PM
- September 30
- sunrise 5:43 AM, sunset 5:51 PM
Other months
Sources
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.