Grignon Weather in August
Average highs run from 22°C on August 1 to 19°C on August 31, and lows from 11°C to 9°C. Normal precipitation for the month is 77 mm over about 12 wet days.
August day by day
The normal high and low for each date, in °C.
- Normal low
- Normal high
- Reanalysis extreme high
- Reanalysis extreme low
August at a glance
- Average high
- 21°C
- Average low
- 10°C
- Precipitation
- 77 mm
- Reanalysis high
- 31°CAug 7, 1991
- Reanalysis low
- 1°CAug 28, 1998
- Daylight
- 14 h 45 min to 13 h 21 min
- Cloud cover
- 56%
- Humidity
- 70%
- Dew point
- 9°C
- Wind
- 5.8 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 |
|---|---|---|---|---|---|
| Aug 1 | 22°C | 11°C | 28°C 2017 | 6°C 1993 | 41% |
| Aug 2 | 22°C | 11°C | 28°C 2017 | 6°C 2002 | 42% |
| Aug 3 | 22°C | 11°C | 29°C 2003 | 7°C 2006 | 42% |
| Aug 4 | 21°C | 11°C | 29°C 2003 | 6°C 2009 | 43% |
| Aug 5 | 21°C | 11°C | 31°C 2003 | 5°C 2020 | 42% |
| Aug 6 | 21°C | 11°C | 31°C 2003 | 6°C 2010 | 42% |
| Aug 7 | 21°C | 11°C | 31°C 1991 | 5°C 2010 | 41% |
| Aug 8 | 21°C | 11°C | 30°C 2003 | 4°C 2005 | 41% |
| Aug 9 | 21°C | 11°C | 30°C 2003 | 4°C 2007 | 41% |
| Aug 10 | 21°C | 11°C | 30°C 2003 | 4°C 2007 | 41% |
| Aug 11 | 21°C | 11°C | 31°C 2003 | 4°C 2016 | 40% |
| Aug 12 | 21°C | 11°C | 31°C 2003 | 5°C 2017 | 39% |
| Aug 13 | 21°C | 11°C | 31°C 2003 | 5°C 2006 | 40% |
| Aug 14 | 21°C | 10°C | 26°C 2003 | 5°C 2006 | 39% |
| Aug 15 | 21°C | 10°C | 27°C 2009 | 3°C 2006 | 38% |
| Aug 16 | 21°C | 10°C | 28°C 2003 | 5°C 2005 | 38% |
| Aug 17 | 21°C | 10°C | 27°C 2009 | 5°C 2014 | 39% |
| Aug 18 | 21°C | 10°C | 29°C 2012 | 6°C 1995 | 38% |
| Aug 19 | 21°C | 10°C | 31°C 2012 | 6°C 1994 | 36% |
| Aug 20 | 21°C | 10°C | 30°C 2009 | 6°C 2007 | 36% |
| Aug 21 | 21°C | 10°C | 30°C 2012 | 5°C 2007 | 36% |
| Aug 22 | 21°C | 10°C | 28°C 2011 | 4°C 2004 | 36% |
| Aug 23 | 21°C | 10°C | 27°C 2011 | 5°C 2007 | 37% |
| Aug 24 | 21°C | 10°C | 28°C 2009 | 2°C 2008 | 38% |
| Aug 25 | 21°C | 10°C | 28°C 2000 | 4°C 1998 | 38% |
| Aug 26 | 20°C | 10°C | 28°C 2000 | 4°C 2018 | 37% |
| Aug 27 | 20°C | 9°C | 26°C 1991 | 3°C 1998 | 37% |
| Aug 28 | 20°C | 9°C | 27°C 2003 | 1°C 1998 | 35% |
| Aug 29 | 20°C | 9°C | 27°C 2017 | 3°C 1998 | 35% |
| Aug 30 | 20°C | 9°C | 27°C 2017 | 2°C 1995 | 35% |
| Aug 31 | 19°C | 9°C | 27°C 2016 | 1°C 1995 | 35% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (GMT+2).
- August 1
- sunrise 6:18 AM, sunset 9:03 PM
- August 31
- sunrise 6:54 AM, sunset 8:15 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.