Grignon Weather in May
Average highs run from 13°C on May 1 to 17°C on May 31, and lows from 2°C to 7°C. Normal precipitation for the month is 99 mm over about 17 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
- 15°C
- Average low
- 4°C
- Precipitation
- 99 mm
- Reanalysis high
- 25°CMay 25, 2009
- Reanalysis low
- -4°CMay 15, 1995
- Daylight
- 14 h 19 min to 15 h 27 min
- Cloud cover
- 73%
- Humidity
- 76%
- Dew point
- 5°C
- Wind
- 6.1 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 | 13°C | 2°C | 21°C 2005 | -4°C 2016 | 54% |
| May 2 | 13°C | 3°C | 20°C 2005 | -2°C 2017 | 55% |
| May 3 | 13°C | 3°C | 19°C 2006 | -2°C 1996 | 56% |
| May 4 | 13°C | 3°C | 21°C 2003 | -4°C 1991 | 57% |
| May 5 | 13°C | 3°C | 19°C 2003 | -4°C 2019 | 58% |
| May 6 | 13°C | 3°C | 21°C 2003 | -4°C 2019 | 58% |
| May 7 | 14°C | 3°C | 21°C 2003 | -3°C 1991 | 58% |
| May 8 | 14°C | 3°C | 20°C 2020 | -4°C 1997 | 57% |
| May 9 | 14°C | 4°C | 20°C 2020 | -2°C 1997 | 56% |
| May 10 | 14°C | 4°C | 22°C 1998 | -2°C 2004 | 55% |
| May 11 | 14°C | 4°C | 23°C 2012 | 0°C 2006 | 56% |
| May 12 | 14°C | 4°C | 22°C 2015 | 0°C 2019 | 55% |
| May 13 | 14°C | 4°C | 23°C 2015 | -3°C 1995 | 54% |
| May 14 | 14°C | 4°C | 23°C 1992 | -4°C 1995 | 55% |
| May 15 | 14°C | 4°C | 21°C 1992 | -4°C 1995 | 56% |
| May 16 | 15°C | 4°C | 21°C 2000 | -3°C 2012 | 54% |
| May 17 | 15°C | 4°C | 23°C 2002 | -3°C 1991 | 52% |
| May 18 | 15°C | 4°C | 20°C 2006 | -2°C 1991 | 52% |
| May 19 | 15°C | 5°C | 20°C 2003 | -1°C 1991 | 51% |
| May 20 | 15°C | 5°C | 21°C 2009 | -2°C 1995 | 50% |
| May 21 | 15°C | 5°C | 22°C 2009 | -1°C 1995 | 49% |
| May 22 | 15°C | 5°C | 22°C 2007 | 0°C 1993 | 49% |
| May 23 | 16°C | 5°C | 24°C 2009 | -1°C 2013 | 50% |
| May 24 | 16°C | 5°C | 25°C 2009 | -3°C 2013 | 51% |
| May 25 | 16°C | 6°C | 25°C 2009 | -1°C 2013 | 51% |
| May 26 | 16°C | 6°C | 22°C 1993 | -1°C 2013 | 50% |
| May 27 | 16°C | 6°C | 23°C 2005 | -1°C 2013 | 52% |
| May 28 | 16°C | 6°C | 22°C 2005 | 1°C 2013 | 52% |
| May 29 | 17°C | 6°C | 24°C 2005 | -1°C 2013 | 52% |
| May 30 | 17°C | 6°C | 22°C 2001 | -1°C 2007 | 54% |
| May 31 | 17°C | 7°C | 24°C 2003 | -1°C 2006 | 56% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (GMT+2).
- May 1
- sunrise 6:23 AM, sunset 8:42 PM
- May 31
- sunrise 5:49 AM, sunset 9:16 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 2026-09-29. Sun and moon: computed with the NOAA solar equations and Meeus.