Oeiras Weather in September
Average highs run from 37°C on September 1 to 38°C on September 30, and lows from 22°C to 24°C. Normal precipitation for the month is 3 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
- 23°C
- Precipitation
- 3 mm
- Reanalysis high
- 41°CSep 29, 2020
- Reanalysis low
- 18°CSep 13, 2006
- Daylight
- 11 h 59 min to 12 h 09 min
- Cloud cover
- 29%
- Humidity
- 38%
- Dew point
- 13°C
- Wind
- 19.4 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 | 37°C | 22°C | 38°C 1993 | 20°C 2018 | 1% |
| Sep 2 | 37°C | 22°C | 38°C 2014 | 20°C 1999 | 1% |
| Sep 3 | 37°C | 22°C | 39°C 2014 | 20°C 2017 | 1% |
| Sep 4 | 37°C | 22°C | 39°C 2014 | 20°C 2017 | 1% |
| Sep 5 | 37°C | 22°C | 39°C 2015 | 20°C 2017 | 1% |
| Sep 6 | 37°C | 23°C | 39°C 2015 | 19°C 2012 | 1% |
| Sep 7 | 37°C | 23°C | 39°C 2015 | 20°C 2010 | 1% |
| Sep 8 | 37°C | 23°C | 39°C 1993 | 19°C 2006 | 1% |
| Sep 9 | 37°C | 23°C | 39°C 1997 | 20°C 2006 | 2% |
| Sep 10 | 37°C | 23°C | 39°C 1997 | 20°C 2006 | 2% |
| Sep 11 | 37°C | 23°C | 39°C 1997 | 20°C 2007 | 2% |
| Sep 12 | 37°C | 23°C | 40°C 2001 | 20°C 2006 | 2% |
| Sep 13 | 37°C | 23°C | 39°C 2015 | 18°C 2006 | 3% |
| Sep 14 | 37°C | 23°C | 39°C 2012 | 19°C 2006 | 3% |
| Sep 15 | 37°C | 23°C | 39°C 2002 | 21°C 2017 | 3% |
| Sep 16 | 37°C | 23°C | 40°C 2016 | 20°C 2017 | 3% |
| Sep 17 | 37°C | 23°C | 40°C 2018 | 21°C 2011 | 3% |
| Sep 18 | 37°C | 23°C | 40°C 2018 | 20°C 2011 | 4% |
| Sep 19 | 38°C | 23°C | 39°C 2018 | 20°C 2011 | 4% |
| Sep 20 | 38°C | 23°C | 40°C 2020 | 19°C 2011 | 4% |
| Sep 21 | 38°C | 24°C | 40°C 2005 | 20°C 2011 | 5% |
| Sep 22 | 38°C | 24°C | 40°C 2012 | 21°C 2017 | 5% |
| Sep 23 | 38°C | 24°C | 40°C 2008 | 21°C 2006 | 5% |
| Sep 24 | 38°C | 24°C | 40°C 2013 | 21°C 2006 | 4% |
| Sep 25 | 38°C | 24°C | 40°C 2011 | 21°C 2017 | 4% |
| Sep 26 | 38°C | 24°C | 40°C 2013 | 21°C 2007 | 5% |
| Sep 27 | 38°C | 24°C | 40°C 1997 | 21°C 2006 | 5% |
| Sep 28 | 38°C | 24°C | 40°C 2020 | 20°C 2006 | 5% |
| Sep 29 | 38°C | 24°C | 41°C 2020 | 21°C 2006 | 5% |
| Sep 30 | 38°C | 24°C | 40°C 2020 | 21°C 2006 | 6% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (GMT-3).
- September 1
- sunrise 5:49 AM, sunset 5:48 PM
- September 30
- sunrise 5:34 AM, sunset 5:43 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.