São João do Piauí Weather in September
Average highs run from 36°C on September 1 to 38°C on September 30, and lows from 21°C to 23°C. Normal precipitation for the month is 6 mm over about 0 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
- 37°C
- Average low
- 21°C
- Precipitation
- 6 mm
- Reanalysis high
- 41°CSep 23, 1997
- Reanalysis low
- 17°CSep 13, 2006
- Daylight
- 11 h 57 min to 12 h 10 min
- Cloud cover
- 22%
- Humidity
- 41%
- Dew point
- 13°C
- Wind
- 23.4 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 | 36°C | 21°C | 38°C 1993 | 19°C 2006 | 1% |
| Sep 2 | 36°C | 21°C | 38°C 2014 | 18°C 2006 | 1% |
| Sep 3 | 36°C | 21°C | 39°C 2014 | 19°C 2017 | 1% |
| Sep 4 | 36°C | 21°C | 39°C 2014 | 19°C 2007 | 2% |
| Sep 5 | 36°C | 21°C | 39°C 2009 | 19°C 2012 | 2% |
| Sep 6 | 36°C | 21°C | 38°C 2015 | 18°C 2012 | 2% |
| Sep 7 | 36°C | 21°C | 39°C 1997 | 18°C 1991 | 2% |
| Sep 8 | 36°C | 21°C | 39°C 1997 | 18°C 1991 | 2% |
| Sep 9 | 36°C | 21°C | 40°C 1997 | 19°C 2006 | 3% |
| Sep 10 | 36°C | 21°C | 39°C 1997 | 20°C 1991 | 4% |
| Sep 11 | 36°C | 21°C | 39°C 1997 | 19°C 2007 | 4% |
| Sep 12 | 36°C | 21°C | 40°C 2001 | 19°C 2006 | 4% |
| Sep 13 | 36°C | 21°C | 39°C 2015 | 17°C 2006 | 4% |
| Sep 14 | 36°C | 21°C | 38°C 2012 | 18°C 2006 | 5% |
| Sep 15 | 37°C | 21°C | 38°C 2002 | 18°C 2006 | 5% |
| Sep 16 | 37°C | 21°C | 39°C 1997 | 19°C 2017 | 5% |
| Sep 17 | 37°C | 21°C | 39°C 2018 | 20°C 2011 | 5% |
| Sep 18 | 37°C | 21°C | 40°C 1993 | 20°C 2002 | 5% |
| Sep 19 | 37°C | 21°C | 39°C 1993 | 19°C 2011 | 5% |
| Sep 20 | 37°C | 22°C | 40°C 2009 | 18°C 2011 | 5% |
| Sep 21 | 37°C | 22°C | 40°C 2005 | 19°C 2011 | 4% |
| Sep 22 | 37°C | 22°C | 40°C 2014 | 19°C 2017 | 4% |
| Sep 23 | 37°C | 22°C | 41°C 1997 | 20°C 2017 | 4% |
| Sep 24 | 37°C | 22°C | 40°C 2013 | 19°C 2006 | 4% |
| Sep 25 | 37°C | 22°C | 40°C 2009 | 19°C 1999 | 3% |
| Sep 26 | 37°C | 22°C | 40°C 2013 | 19°C 1999 | 3% |
| Sep 27 | 38°C | 22°C | 40°C 2012 | 19°C 2006 | 3% |
| Sep 28 | 38°C | 22°C | 40°C 2019 | 20°C 2007 | 3% |
| Sep 29 | 38°C | 22°C | 40°C 2010 | 20°C 1999 | 4% |
| Sep 30 | 38°C | 23°C | 40°C 2009 | 20°C 2012 | 4% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (GMT-3).
- September 1
- sunrise 5:51 AM, sunset 5:48 PM
- September 30
- sunrise 5:34 AM, sunset 5:44 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 2026-09-25. Sun and moon: computed with the NOAA solar equations and Meeus.