Weather on August 20
Des Moines, IA
55 Years of Data
Avg High
83°F
Avg Low
61°F
Warmest
2023
86°F avg
Coldest
2015
58°F avg
About This Date
August 20th in Des Moines, IA typically brings warm summer weather, with average highs around 83°F and lows near 61°F. Over 55 years of records, the warmest August 20th was in 2023 (86°F average), while the coldest was 2015 (58°F) — a 28°F range across recorded history. Rain or other precipitation has occurred on about 29% of August 20th dates historically, with the wettest August 20th recording 4.39" of rain. The last decade has been 4.3°F warmer on this date compared to 20-30 years ago.
The last decade has been 4.3°F warmer on this date compared to 20-30 years ago.
Planning for August 20th in Des Moines, IA? Stay hydrated and seek shade during peak afternoon hours.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 87° | 70° | 78° | — | — |
| 2024 | 77° | 59° | 68° | 0.23" | — |
| 2023warmest | 94° | 78° | 86° | — | — |
| 2022 | 75° | 63° | 69° | 0.03" | — |
| 2021 | 90° | 70° | 80° | — | — |
| 2020 | 83° | 55° | 69° | — | — |
| 2019 | 83° | 64° | 73° | 3.68" | — |
| 2018 | 77° | 65° | 71° | 2.08" | — |
| 2017 | 85° | 65° | 75° | 0.81" | — |
| 2016 | 87° | 64° | 76° | 4.39" | — |
| 2015coldest | 64° | 52° | 58° | 0.15" | — |
| 2014 | 83° | 64° | 73° | 0.58" | — |
| 2013 | 86° | 61° | 73° | — | — |
| 2012 | 83° | 54° | 68° | — | — |
| 2011 | 92° | 59° | 75° | 0.25" | — |
| 2010 | 90° | 67° | 78° | — | — |
| 2009 | 80° | 60° | 70° | 1.91" | — |
| 2008 | 87° | 61° | 74° | — | — |
| 2007 | 88° | 71° | 79° | — | — |
| 2006 | 73° | 57° | 65° | — | — |
| 2005 | 93° | 64° | 79° | 0.91" | — |
| 2004 | 70° | 48° | 59° | — | — |
| 2003 | 95° | 74° | 84° | — | — |
| 2002 | 76° | 49° | 62° | — | — |
| 2001 | 81° | 54° | 67° | — | — |
| 2000 | 75° | 62° | 69° | 0.18" | — |
| 1999 | 78° | 55° | 67° | — | — |
| 1998 | 89° | 69° | 79° | — | — |
| 1997 | 72° | 56° | 64° | — | — |
| 1996 | 81° | 64° | 72° | 0.43" | — |
| 1995 | 79° | 53° | 66° | — | — |
| 1994 | 87° | 57° | 72° | — | — |
| 1993 | 83° | 64° | 73° | — | — |
| 1992 | 76° | 50° | 63° | — | — |
| 1991 | 72° | 49° | 60° | — | — |
| 1990 | 82° | 69° | 76° | 0.03" | — |
| 1989 | 84° | 63° | 73° | — | — |
| 1988 | 86° | 66° | 76° | — | — |
| 1987 | 76° | 57° | 66° | 0.38" | — |
| 1986 | 80° | 58° | 69° | — | — |
| 1985 | 76° | 49° | 62° | — | — |
| 1984 | 83° | 55° | 69° | — | — |
| 1983 | 99° | 66° | 82° | — | — |
| 1982 | 83° | 67° | 75° | — | — |
| 1981 | 78° | 53° | 66° | — | — |
| 1980 | 92° | 73° | 82° | — | — |
| 1979 | 87° | 68° | 78° | 1.65" | — |
| 1978 | 84° | 51° | 68° | — | — |
| 1977 | 83° | 57° | 70° | — | — |
| 1976 | 88° | 60° | 74° | — | — |
| 1975 | 83° | 65° | 74° | — | — |
| 1974 | 85° | 68° | 76° | — | — |
| 1973 | 85° | 69° | 77° | — | — |
| 1972 | 93° | 71° | 82° | — | — |
| 1971 | 87° | 62° | 75° | — | — |
55 years of data from ANKENY