Weather on August 20
Des Moines, IA
55 Years of Data
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 56 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 1.73" 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 |
|---|---|---|---|---|---|
| 2026 | 85° | 65° | 75° | — | — |
| 2025 | 87° | 70° | 78° | — | — |
| 2024 | 77° | 59° | 68° | 0.09" | — |
| 2023warmest | 94° | 78° | 86° | — | — |
| 2022 | 75° | 63° | 69° | 0.01" | — |
| 2021 | 90° | 70° | 80° | — | — |
| 2020 | 83° | 55° | 69° | — | — |
| 2019 | 83° | 64° | 73° | 1.45" | — |
| 2018 | 77° | 65° | 71° | 0.82" | — |
| 2017 | 85° | 65° | 75° | 0.32" | — |
| 2016 | 87° | 64° | 76° | 1.73" | — |
| 2015coldest | 64° | 52° | 58° | 0.06" | — |
| 2014 | 83° | 64° | 73° | 0.23" | — |
| 2013 | 86° | 61° | 73° | — | — |
| 2012 | 83° | 54° | 68° | — | — |
| 2011 | 92° | 59° | 75° | 0.1" | — |
| 2010 | 90° | 67° | 78° | — | — |
| 2009 | 80° | 60° | 70° | 0.75" | — |
| 2008 | 87° | 61° | 74° | — | — |
| 2007 | 88° | 71° | 79° | — | — |
| 2006 | 73° | 57° | 65° | — | — |
| 2005 | 93° | 64° | 79° | 0.36" | — |
| 2004 | 70° | 48° | 59° | — | — |
| 2003 | 95° | 74° | 84° | — | — |
| 2002 | 76° | 49° | 62° | — | — |
| 2001 | 81° | 54° | 67° | — | — |
| 2000 | 75° | 62° | 69° | 0.07" | — |
| 1999 | 78° | 55° | 67° | — | — |
| 1998 | 89° | 69° | 79° | — | — |
| 1997 | 72° | 56° | 64° | — | — |
| 1996 | 81° | 64° | 72° | 0.17" | — |
| 1995 | 79° | 53° | 66° | — | — |
| 1994 | 87° | 57° | 72° | — | — |
| 1993 | 83° | 64° | 73° | — | — |
| 1992 | 76° | 50° | 63° | — | — |
| 1991 | 72° | 49° | 60° | — | — |
| 1990 | 82° | 69° | 76° | 0.01" | — |
| 1989 | 84° | 63° | 73° | — | — |
| 1988 | 86° | 66° | 76° | — | — |
| 1987 | 76° | 57° | 66° | 0.15" | — |
| 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° | 0.65" | — |
| 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° | — | — |
Des Moines, IA Temperature Range by Month
Average monthly highs and lows. The shaded band shows the typical daily temperature range.
Des Moines, IA Monthly Precipitation
Average rainfall and snowfall per month, in inches.
Des Moines, IA Daily Temperature Calendar
Average daily high temperature for every day of the year. Each cell is the climatological mean for that calendar day across 55 years of NOAA data.
Best Time to Visit Des Moines, IA
Most pleasant months in Des Moines, IA: May, June, September.
What to expect on August 20th
This page shows what actually happened each year. For the odds — typical high and low, and how often it stays dry — see the climatological outlook for this date.
August 20th outlook →