September 9 in Sion, through the years

Typical high: 25°. Hottest: 27.4° (2017). Coldest night: 16.4° (1997).

YEARHIGHLOWRAIN
2025 23.9° 18.5° 10.6 mm
2024 26° 20.1° 7.3 mm
2023 26.2° 19.1° 5.4 mm
2022 25.8° 18.5° 17 mm
2021 25.5° 18.6° 17.2 mm
2020 26.6° 17.8° 29 mm
2019 25.4° 19.3° 7.4 mm
2018 25.3° 17.5° 18.2 mm
2017 27.4° 18.2° 4.7 mm
2016 26.5° 19° 2.1 mm
2015 25.9° 17.2° 1.5 mm
2014 24° 18.9° 9 mm
2013 24.7° 17.3° 12.7 mm
2012 26.1° 18.2° 2.2 mm
2011 25.7° 18.2° 35.8 mm
2010 26.4° 19.3° 8.5 mm
2009 23.4° 18.2° 8.8 mm
2008 23.5° 17.8° 5.5 mm
2007 25.6° 18.8° 5.1 mm
2006 24.5° 17.8° 13.2 mm
2005 24° 18.4° 9.7 mm
2004 23.2° 17.8° 3.1 mm
2003 23.9° 18.6° 2.9 mm
2002 24° 18.1° 13.1 mm
2001 21.1° 18° 9.9 mm
2000 23.1° 18.8° 8.5 mm
1999 24.6° 16.7° 5 mm
1998 25.4° 17.9° 6.9 mm
1997 26.3° 16.4° 9.9 mm
1996 25.5° 16.6° 3.4 mm
Source: ERA5 reanalysis (Copernicus C3S)

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