Grignon Weather in July
Average highs run from 20°C on July 1 to 22°C on July 31, and lows from 10°C to 11°C. Normal precipitation for the month is 82 mm over about 13 wet days.
July day by day
The normal high and low for each date, in °C.
- Normal low
- Normal high
- Reanalysis extreme high
- Reanalysis extreme low
July at a glance
- Average high
- 21°C
- Average low
- 10°C
- Precipitation
- 82 mm
- Reanalysis high
- 31°CJul 20, 2003
- Reanalysis low
- 2°CJul 13, 1993
- Daylight
- 15 h 39 min to 14 h 47 min
- Cloud cover
- 56%
- Humidity
- 72%
- Dew point
- 10°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 |
|---|---|---|---|---|---|
| Jul 1 | 20°C | 10°C | 26°C 2015 | 6°C 2014 | 45% |
| Jul 2 | 20°C | 10°C | 26°C 1994 | 5°C 1996 | 44% |
| Jul 3 | 20°C | 10°C | 29°C 2015 | 2°C 1996 | 45% |
| Jul 4 | 20°C | 10°C | 27°C 2015 | 6°C 2005 | 45% |
| Jul 5 | 20°C | 10°C | 29°C 2015 | 5°C 2007 | 44% |
| Jul 6 | 20°C | 10°C | 27°C 1991 | 5°C 1993 | 44% |
| Jul 7 | 20°C | 10°C | 28°C 2015 | 4°C 1993 | 45% |
| Jul 8 | 20°C | 10°C | 27°C 2017 | 3°C 1996 | 44% |
| Jul 9 | 20°C | 10°C | 29°C 2010 | 3°C 1996 | 43% |
| Jul 10 | 20°C | 10°C | 26°C 2010 | 4°C 2014 | 42% |
| Jul 11 | 20°C | 10°C | 28°C 1991 | 3°C 1993 | 41% |
| Jul 12 | 20°C | 10°C | 27°C 2011 | 4°C 1993 | 40% |
| Jul 13 | 20°C | 10°C | 27°C 2003 | 2°C 1993 | 39% |
| Jul 14 | 20°C | 10°C | 28°C 2003 | 4°C 2016 | 38% |
| Jul 15 | 20°C | 10°C | 29°C 2003 | 3°C 2001 | 38% |
| Jul 16 | 20°C | 10°C | 27°C 2003 | 3°C 2001 | 38% |
| Jul 17 | 21°C | 10°C | 27°C 1994 | 3°C 2000 | 40% |
| Jul 18 | 21°C | 10°C | 26°C 2014 | 5°C 2009 | 39% |
| Jul 19 | 21°C | 10°C | 28°C 2003 | 5°C 2011 | 38% |
| Jul 20 | 21°C | 11°C | 31°C 2003 | 5°C 2011 | 39% |
| Jul 21 | 21°C | 11°C | 28°C 2003 | 4°C 2001 | 40% |
| Jul 22 | 21°C | 11°C | 28°C 2004 | 5°C 2008 | 39% |
| Jul 23 | 21°C | 11°C | 29°C 2019 | 4°C 1993 | 40% |
| Jul 24 | 21°C | 11°C | 30°C 2019 | 5°C 2011 | 40% |
| Jul 25 | 21°C | 11°C | 30°C 2019 | 4°C 2011 | 40% |
| Jul 26 | 21°C | 11°C | 27°C 2003 | 6°C 1993 | 40% |
| Jul 27 | 21°C | 11°C | 28°C 2005 | 4°C 1993 | 41% |
| Jul 28 | 21°C | 11°C | 29°C 2005 | 8°C 2010 | 42% |
| Jul 29 | 21°C | 11°C | 27°C 2009 | 7°C 2014 | 42% |
| Jul 30 | 22°C | 11°C | 26°C 2020 | 6°C 2007 | 42% |
| Jul 31 | 22°C | 11°C | 28°C 2020 | 4°C 2007 | 42% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (GMT+2).
- July 1
- sunrise 5:49 AM, sunset 9:28 PM
- July 31
- sunrise 6:17 AM, sunset 9:04 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.