Weather on September 21 at Arches
Arches National Park
Based on 54 years of data from Moab, UT
Elevation Note: Arches sits at 4,500 ft. Expect temperatures 16°F cooler than the data shown below, which comes from Moab, UT at a lower elevation.
Planning Your Visit
September 21st in Arches National Park (via Moab, UT) typically brings warm fall weather, with average highs around 85°F and lows near 51°F — a 34°F daily swing. Over 54 years of records, the warmest September 21st was in 2014 (79°F average), while the coldest was 1978 (52°F) — a 27°F range across recorded history. Rain or other precipitation has occurred on about 17% of September 21st dates historically, with the wettest September 21st recording 1.12" of rain. The last decade has been 3.1°F warmer on this date compared to 20-30 years ago.
The last decade has been 3.1°F warmer on this date compared to 20-30 years ago.
Planning for September 21st in Arches? Stay hydrated and seek shade during peak afternoon hours.
Year by Year History
| Year | High | Low | Precip | Snow |
|---|---|---|---|---|
| 2025 | 86°F | 58°F | 0" | 0" |
| 2024 | 82°F | 54°F | 0" | 0" |
| 2023 | 84°F | 66°F | 0" | 0" |
| 2022 | 97°F | 55°F | 0.33" | 0" |
| 2021 | 83°F | 42°F | 0" | 0" |
| 2020 | 91°F | 54°F | 0" | 0" |
| 2019 | 77°F | 44°F | 0" | 0" |
| 2018 | 87°F | 47°F | 0" | 0" |
| 2017 | 86°F | 68°F | 0" | 0" |
| 2016 | 81°F | 59°F | 0" | 0" |
| 2015 | 90°F | 46°F | 0" | 0" |
| 2014 | 94°F | 65°F | 0.61" | 0" |
| 2013 | 88°F | 52°F | 0" | 0" |
| 2012 | 90°F | 47°F | 0" | 0" |
| 2011 | 89°F | 51°F | 0" | 0" |
| 2010 | 92°F | 53°F | 0" | 0" |
| 2009 | 83°F | 49°F | 0" | 0" |
| 2008 | 88°F | 59°F | 0" | 0" |
| 2007 | 88°F | 63°F | 0" | 0" |
| 2006 | 67°F | 44°F | 0.05" | 0" |
| 2005 | 91°F | 48°F | 0.05" | 0" |
| 2004 | 71°F | 48°F | 1.12" | 0" |
| 2003 | 87°F | 43°F | 0" | 0" |
| 2002 | 87°F | 46°F | 0" | 0" |
| 2001 | 95°F | 49°F | 0" | 0" |
| 2000 | 90°F | 52°F | 0.03" | 0" |
| 1999 | 83°F | 46°F | 0" | 0" |
| 1998 | 88°F | 55°F | 0" | -- |
| 1997 | 76°F | 56°F | 0.61" | 0" |
| 1996 | 87°F | 39°F | 0" | 0" |
| 1995 | 82°F | 44°F | 0" | 0" |
| 1994 | 85°F | 47°F | 0" | 0" |
| 1993 | 91°F | 62°F | 0" | 0" |
| 1992 | 89°F | 55°F | 0" | 0" |
| 1991 | 95°F | 51°F | 0" | 0" |
| 1989 | 84°F | 47°F | 0" | 0" |
| 1988 | 88°F | 60°F | 0.08" | 0" |
| 1987 | 92°F | 42°F | 0" | 0" |
| 1986 | 87°F | 46°F | 0" | 0" |
| 1985 | 76°F | 49°F | 0" | 0" |
| 1984 | 87°F | 58°F | 0.08" | 0" |
| 1983 | 68°F | 41°F | 0" | 0" |
| 1982 | 89°F | 58°F | 0" | 0" |
| 1981 | 93°F | 54°F | 0" | 0" |
| 1980 | 85°F | 51°F | 0" | 0" |
| 1979 | 86°F | 54°F | 0" | 0" |
| 1978 | 72°F | 32°F | 0" | 0" |
| 1977 | 84°F | 53°F | 0" | 0" |
| 1976 | 88°F | 51°F | 0" | 0" |
| 1975 | 82°F | 55°F | 0" | 0" |
| 1974 | 89°F | 51°F | 0" | 0" |
| 1973 | 89°F | 56°F | 0" | 0" |
| 1972 | 78°F | 45°F | 0" | 0" |
| 1971 | 71°F | 52°F | 0" | 0" |