Oeiras Weather in May
Average highs run from 33°C on May 1 to 34°C on May 31, and lows from 22°C to 22°C. Normal precipitation for the month is 37 mm over about 6 wet days.
May day by day
The normal high and low for each date, in °C.
- Normal low
- Normal high
- Reanalysis extreme high
- Reanalysis extreme low
May at a glance
- Average high
- 34°C
- Average low
- 22°C
- Precipitation
- 37 mm
- Reanalysis high
- 39°CMay 1, 2016
- Reanalysis low
- 17°CMay 4, 2004
- Daylight
- 11 h 51 min to 11 h 44 min
- Cloud cover
- 51%
- Humidity
- 61%
- Dew point
- 19°C
- Wind
- 13.7 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 |
|---|---|---|---|---|---|
| May 1 | 33°C | 22°C | 39°C 2016 | 20°C 2004 | 35% |
| May 2 | 33°C | 22°C | 38°C 2016 | 19°C 1996 | 34% |
| May 3 | 33°C | 22°C | 37°C 2012 | 19°C 2004 | 32% |
| May 4 | 33°C | 22°C | 37°C 2016 | 17°C 2004 | 30% |
| May 5 | 33°C | 22°C | 37°C 2016 | 20°C 2019 | 30% |
| May 6 | 33°C | 22°C | 38°C 2017 | 20°C 2019 | 28% |
| May 7 | 33°C | 22°C | 38°C 1998 | 19°C 2003 | 26% |
| May 8 | 33°C | 22°C | 37°C 2017 | 20°C 2011 | 24% |
| May 9 | 33°C | 22°C | 38°C 2010 | 20°C 2007 | 22% |
| May 10 | 34°C | 22°C | 38°C 2012 | 20°C 1994 | 21% |
| May 11 | 34°C | 22°C | 37°C 2012 | 19°C 1997 | 20% |
| May 12 | 34°C | 22°C | 38°C 2012 | 19°C 1997 | 20% |
| May 13 | 34°C | 23°C | 38°C 1998 | 19°C 1997 | 20% |
| May 14 | 34°C | 22°C | 38°C 2012 | 20°C 1996 | 19% |
| May 15 | 34°C | 23°C | 38°C 1992 | 20°C 2008 | 20% |
| May 16 | 34°C | 23°C | 38°C 1993 | 20°C 2001 | 19% |
| May 17 | 34°C | 23°C | 37°C 2010 | 19°C 2001 | 20% |
| May 18 | 34°C | 23°C | 37°C 1998 | 20°C 2006 | 22% |
| May 19 | 34°C | 23°C | 37°C 2016 | 20°C 2004 | 22% |
| May 20 | 34°C | 22°C | 37°C 2018 | 19°C 1996 | 21% |
| May 21 | 34°C | 22°C | 37°C 2010 | 19°C 1997 | 21% |
| May 22 | 34°C | 22°C | 38°C 2013 | 20°C 1996 | 21% |
| May 23 | 34°C | 22°C | 38°C 2016 | 20°C 1996 | 20% |
| May 24 | 34°C | 22°C | 37°C 1992 | 20°C 1996 | 20% |
| May 25 | 34°C | 22°C | 37°C 2010 | 19°C 2000 | 19% |
| May 26 | 34°C | 22°C | 37°C 2010 | 20°C 2000 | 18% |
| May 27 | 34°C | 22°C | 38°C 1998 | 18°C 2000 | 16% |
| May 28 | 34°C | 22°C | 38°C 1998 | 19°C 2000 | 15% |
| May 29 | 34°C | 22°C | 38°C 1998 | 19°C 2000 | 15% |
| May 30 | 34°C | 22°C | 38°C 1998 | 18°C 1999 | 13% |
| May 31 | 34°C | 22°C | 37°C 1992 | 18°C 1995 | 12% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (GMT-3).
- May 1
- sunrise 5:50 AM, sunset 5:41 PM
- May 31
- sunrise 5:54 AM, sunset 5:38 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.