Chatou Weather in September
Average highs run from 24°C on September 1 to 20°C on September 30, and lows from to 10°C. Normal precipitation for the month is 41 mm over about 9 wet days.
September day by day
The normal high and low for each date, and the record, in °C.
- Normal low
- Normal high
- Record high
- Record low
September at a glance
- Average high
- 22°C
- Precipitation
- 41 mm
- Record high
- 36°CSep 9, 1911
- Record low
- 3°CSep 20, 1952
- Daylight
- 13 h 26 min to 11 h 44 min
- Cloud cover
- 63%
- Humidity
- 77%
- Dew point
- 11°C
- Wind
- 14.4 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 | Record high | Record low | Chance wet |
|---|---|---|---|---|---|
| Sep 1 | 24°C | 33°C 1953 | 6°C 1934 | 28% | |
| Sep 2 | 23°C | 14°C | 35°C 1911 | 4°C 1918 | 29% |
| Sep 3 | 23°C | 13°C | 34°C 1929 | 7°C 1909 | 28% |
| Sep 4 | 23°C | 13°C | 34°C 1929 | 7°C 1923 | 29% |
| Sep 5 | 23°C | 34°C 1911 | 8°C 1925 | 30% | |
| Sep 6 | 22°C | 33°C 2023 | 6°C 1909 | 30% | |
| Sep 7 | 22°C | 33°C 1911 | 6°C 1925 | 31% | |
| Sep 8 | 23°C | 13°C | 35°C 2023 | 7°C 1931 | 33% |
| Sep 9 | 24°C | 13°C | 36°C 1911 | 7°C 1912 | 33% |
| Sep 10 | 24°C | 13°C | 35°C 2023 | 5°C 1912 | 33% |
| Sep 11 | 23°C | 33°C 1919 | 5°C 1924 | 32% | |
| Sep 12 | 22°C | 33°C 1911 | 6°C 1931 | 32% | |
| Sep 13 | 22°C | 33°C 2016 | 4°C 1903 | 33% | |
| Sep 14 | 21°C | 34°C 2020 | 4°C 1902 | 32% | |
| Sep 15 | 21°C | 33°C 1947 | 5°C 1908 | 32% | |
| Sep 16 | 22°C | 33°C 1961 | 7°C 1923 | 33% | |
| Sep 17 | 21°C | 31°C 1961 | 6°C 1938 | 33% | |
| Sep 18 | 21°C | 32°C 1961 | 5°C 2010 | 34% | |
| Sep 19 | 21°C | 33°C 1947 | 4°C 2010 | 34% | |
| Sep 20 | 21°C | 11°C | 30°C 1987 | 3°C 1952 | 34% |
| Sep 21 | 22°C | 10°C | 28°C 2019 | 5°C 1952 | 34% |
| Sep 22 | 21°C | 28°C 1985 | 5°C 1912 | 33% | |
| Sep 23 | 22°C | 11°C | 28°C 1915 | 4°C 1911 | 33% |
| Sep 24 | 21°C | 30°C 1983 | 4°C 1931 | 35% | |
| Sep 25 | 20°C | 11°C | 27°C 1907 | 4°C 1912 | 36% |
| Sep 26 | 20°C | 11°C | 28°C 1946 | 3°C 1912 | 38% |
| Sep 27 | 20°C | 11°C | 29°C 1946 | 3°C 1912 | 38% |
| Sep 28 | 20°C | 11°C | 29°C 1946 | 4°C 1939 | 40% |
| Sep 29 | 20°C | 12°C | 28°C 2011 | 5°C 1924 | 41% |
| Sep 30 | 20°C | 10°C | 29°C 2011 | 3°C 2018 | 43% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (GMT+2).
- September 1
- sunrise 7:08 AM, sunset 8:34 PM
- September 30
- sunrise 7:49 AM, sunset 7:33 PM
Other months
Sources
Records: NOAA GHCN-Daily, station FRM00007150, every year on file, quality-flagged values removed. Cloud, humidity, wind and sunshine: 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.