September 1 in Boulder, through the years

Typical high: 20.9°. Hottest: 31° (2023). Coldest night: (2004).

YEARHIGHLOWRAIN
2025 21.9° 5.1° 0 mm
2024 22.2° 8.7° 0 mm
2023 31° 13.4° 0 mm
2022 19.5° 0 mm
2021 26.5° 10.7° 0.1 mm
2020 18.9° 11.2° 0 mm
2019 25.9° 6.6° 0 mm
2018 15.7° 5.4° 0 mm
2017 18.3° 8.4° 0.5 mm
2016 15.8° 8.7° 0 mm
2015 12.2° 4.8° 0 mm
2014 17.5° 9.1° 0 mm
2013 25.1° 12.4° 0 mm
2012 23.8° 11.8° 0 mm
2011 26.5° 9.1° 0 mm
2010 12° 7.5° 14.3 mm
2009 22.5° 3.5° 0 mm
2008 17.9° 4.1° 0 mm
2007 23.4° 0 mm
2006 22.1° 11.9° 2.2 mm
2005 18.6° 5.6° 0 mm
2004 18.4° 0 mm
2003 19.4° 4.8° 0 mm
2002 21.9° 10.9° 2.1 mm
2001 18.4° 7.3° 0 mm
2000 16.8° 0 mm
1999 28.2° 13° 0.1 mm
1998 28.7° 9.3° 0 mm
1997 20.5° 5.3° 0.5 mm
1996 18.2° 7.7° 0 mm
Source: ERA5 reanalysis (Copernicus C3S)

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