Weather on August 21
Salt Lake City, UT
55 Years of Data
Avg High
90°F
Avg Low
63°F
Warmest
1992
85°F avg
Coldest
1974
63°F avg
About This Date
August 21st in Salt Lake City, UT typically brings hot summer weather, with average highs around 90°F and lows near 63°F — a 27°F daily swing. Over 55 years of records, the warmest August 21st was in 1992 (85°F average), while the coldest was 1974 (63°F) — a 22°F range across recorded history. Rain or other precipitation has occurred on about 20% of August 21st dates historically, with the wettest August 21st recording 1.3" of rain. The last decade has been 4.0°F warmer on this date compared to 20-30 years ago.
The last decade has been 4.0°F warmer on this date compared to 20-30 years ago.
Planning for August 21st in Salt Lake City, UT? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
1.4°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 93° | 71° | 82° | — | — |
| 2024 | 92° | 71° | 81° | — | — |
| 2023 | 87° | 70° | 78° | 0.03" | — |
| 2022 | 91° | 65° | 78° | — | — |
| 2021 | 87° | 57° | 72° | 1.3" | — |
| 2020 | 98° | 69° | 84° | — | — |
| 2019 | 99° | 67° | 83° | — | — |
| 2018 | 87° | 66° | 77° | 0.13" | — |
| 2017 | 93° | 69° | 81° | — | — |
| 2016 | 95° | 63° | 79° | — | — |
| 2015 | 95° | 67° | 81° | — | — |
| 2014 | 82° | 63° | 72° | — | — |
| 2013 | 94° | 71° | 82° | — | — |
| 2012 | 95° | 65° | 80° | — | — |
| 2011 | 95° | 71° | 83° | — | — |
| 2010 | 98° | 70° | 84° | — | — |
| 2009 | 100° | 64° | 82° | — | — |
| 2008 | 96° | 66° | 81° | — | — |
| 2007 | 89° | 60° | 75° | — | — |
| 2006 | 97° | 67° | 82° | — | — |
| 2005 | 93° | 63° | 78° | — | — |
| 2004 | 85° | 62° | 73° | — | — |
| 2003 | 93° | 69° | 81° | 0.46" | — |
| 2002 | 82° | 58° | 70° | — | — |
| 2001 | 82° | 60° | 71° | 0.1" | — |
| 2000 | 86° | 56° | 71° | — | — |
| 1999 | 86° | 63° | 74° | — | — |
| 1998 | 93° | 66° | 80° | 0.08" | — |
| 1997 | 96° | 69° | 83° | 0.03" | — |
| 1996 | 87° | 60° | 74° | — | — |
| 1995 | 90° | 66° | 78° | 0.38" | — |
| 1994 | 95° | 70° | 82° | — | — |
| 1993 | 80° | 57° | 69° | — | — |
| 1992warmest | 97° | 73° | 85° | — | — |
| 1991 | 97° | 63° | 80° | — | — |
| 1990 | 82° | 59° | 71° | — | — |
| 1989 | 89° | 58° | 73° | — | — |
| 1988 | 87° | 65° | 76° | — | — |
| 1987 | 88° | 63° | 75° | 0.28" | — |
| 1986 | 84° | 63° | 73° | 0.05" | — |
| 1985 | 91° | 65° | 78° | — | — |
| 1984 | 87° | 62° | 75° | — | — |
| 1983 | 81° | 55° | 68° | 0.53" | — |
| 1982 | 97° | 64° | 80° | — | — |
| 1981 | 93° | 66° | 80° | — | — |
| 1980 | 91° | 53° | 72° | — | — |
| 1979 | 87° | 56° | 71° | — | — |
| 1978 | 89° | 61° | 75° | — | — |
| 1977 | 88° | 67° | 77° | — | — |
| 1976 | 94° | 58° | 76° | — | — |
| 1975 | 78° | 53° | 66° | — | — |
| 1974coldest | 86° | 40° | 63° | — | — |
| 1973 | 87° | 65° | 76° | — | — |
| 1972 | 88° | 60° | 74° | — | — |
| 1971 | 93° | 67° | 80° | — | — |
55 years of data from SALT LAKE CITY SUB SEW