Cascais Weather in May
Average highs run from 18°C on May 1 to 20°C on May 31, and lows from 14°C to 16°C. Normal precipitation for the month is 40 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
- 19°C
- Average low
- 15°C
- Precipitation
- 40 mm
- Reanalysis high
- 28°CMay 30, 2019
- Reanalysis low
- 10°CMay 4, 1991
- Daylight
- 13 h 50 min to 14 h 41 min
- Cloud cover
- 53%
- Humidity
- 79%
- Dew point
- 13°C
- Wind
- 20.5 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 | 18°C | 14°C | 25°C 1994 | 11°C 2001 | 25% |
| May 2 | 18°C | 14°C | 23°C 1994 | 11°C 2004 | 26% |
| May 3 | 18°C | 14°C | 24°C 2016 | 11°C 1991 | 26% |
| May 4 | 18°C | 14°C | 23°C 1995 | 10°C 1991 | 26% |
| May 5 | 18°C | 14°C | 21°C 2005 | 11°C 2010 | 27% |
| May 6 | 18°C | 14°C | 23°C 2005 | 11°C 1991 | 26% |
| May 7 | 18°C | 14°C | 22°C 2017 | 12°C 2004 | 26% |
| May 8 | 18°C | 14°C | 23°C 2007 | 12°C 2004 | 25% |
| May 9 | 19°C | 14°C | 21°C 2015 | 12°C 1991 | 25% |
| May 10 | 19°C | 14°C | 24°C 2011 | 12°C 1991 | 25% |
| May 11 | 19°C | 14°C | 24°C 2011 | 12°C 1991 | 26% |
| May 12 | 19°C | 15°C | 28°C 2019 | 11°C 1991 | 25% |
| May 13 | 19°C | 15°C | 28°C 2019 | 12°C 2010 | 25% |
| May 14 | 19°C | 15°C | 25°C 2014 | 13°C 2018 | 25% |
| May 15 | 19°C | 15°C | 25°C 2012 | 13°C 1991 | 24% |
| May 16 | 19°C | 15°C | 25°C 2017 | 13°C 2013 | 24% |
| May 17 | 19°C | 15°C | 25°C 2015 | 13°C 2013 | 24% |
| May 18 | 19°C | 15°C | 24°C 2007 | 13°C 2013 | 23% |
| May 19 | 19°C | 15°C | 24°C 2010 | 12°C 2013 | 22% |
| May 20 | 20°C | 15°C | 26°C 2010 | 11°C 2013 | 21% |
| May 21 | 20°C | 15°C | 26°C 2003 | 13°C 2013 | 21% |
| May 22 | 20°C | 15°C | 26°C 2003 | 13°C 2013 | 21% |
| May 23 | 20°C | 15°C | 25°C 2017 | 13°C 2016 | 21% |
| May 24 | 20°C | 15°C | 26°C 2011 | 13°C 2014 | 20% |
| May 25 | 20°C | 15°C | 25°C 1999 | 14°C 2013 | 19% |
| May 26 | 20°C | 16°C | 25°C 2020 | 13°C 2014 | 17% |
| May 27 | 20°C | 16°C | 27°C 2006 | 13°C 2003 | 16% |
| May 28 | 20°C | 16°C | 28°C 2006 | 13°C 2013 | 15% |
| May 29 | 20°C | 16°C | 27°C 2009 | 13°C 2013 | 15% |
| May 30 | 20°C | 16°C | 28°C 2019 | 13°C 2013 | 14% |
| May 31 | 20°C | 16°C | 26°C 2012 | 14°C 2013 | 14% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (GMT+1).
- May 1
- sunrise 6:40 AM, sunset 8:30 PM
- May 31
- sunrise 6:15 AM, sunset 8:56 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.