Weather on August 18
Madison, WI
55 Years of Data
Avg High
81°F
Avg Low
57°F
Warmest
1988
87°F avg
Coldest
1977
56°F avg
About This Date
August 18th in Madison, WI typically brings warm summer weather, with average highs around 81°F and lows near 57°F. Over 55 years of records, the warmest August 18th was in 1988 (87°F average), while the coldest was 1977 (56°F) — a 31°F range across recorded history. Rain or other precipitation has occurred on about 35% of August 18th dates historically, with the wettest August 18th recording 3.18" of rain. The last decade has been 3.4°F warmer on this date compared to 20-30 years ago.
The last decade has been 3.4°F warmer on this date compared to 20-30 years ago.
Planning for August 18th in Madison, WI? Stay hydrated and seek shade during peak afternoon hours. Consider bringing rain gear or an umbrella.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 78° | 64° | 71° | 0.2" | — |
| 2024 | 80° | 66° | 73° | — | — |
| 2023 | 74° | 49° | 61° | — | — |
| 2022 | 83° | 55° | 69° | — | — |
| 2021 | 85° | 60° | 72° | — | — |
| 2020 | 86° | 57° | 72° | — | — |
| 2019 | 80° | 64° | 72° | 1.5" | — |
| 2018 | 80° | 62° | 71° | 0.94" | — |
| 2017 | 76° | 63° | 69° | 0.15" | — |
| 2016 | 82° | 64° | 73° | — | — |
| 2015 | 85° | 65° | 75° | 1.75" | — |
| 2014 | 77° | 58° | 67° | — | — |
| 2013 | 80° | 50° | 65° | — | — |
| 2012 | 74° | 46° | 60° | 0.03" | — |
| 2011 | 84° | 51° | 68° | — | — |
| 2010 | 71° | 57° | 64° | — | — |
| 2009 | 81° | 62° | 71° | 0.15" | — |
| 2008 | 87° | 62° | 75° | — | — |
| 2007 | 75° | 54° | 64° | — | — |
| 2006 | 70° | 58° | 64° | 0.89" | — |
| 2005 | 84° | 56° | 70° | 0.08" | — |
| 2004 | 79° | 51° | 65° | — | — |
| 2003 | 86° | 53° | 70° | — | — |
| 2002 | 80° | 53° | 67° | — | — |
| 2001 | 79° | 59° | 69° | — | — |
| 2000 | 64° | 55° | 60° | 0.05" | — |
| 1999 | 83° | 58° | 70° | — | — |
| 1998 | 84° | 61° | 72° | 0.89" | — |
| 1997 | 65° | 49° | 57° | 0.81" | — |
| 1996 | 80° | 57° | 69° | — | — |
| 1995 | 89° | 70° | 79° | — | — |
| 1994 | 84° | 51° | 68° | 0.94" | — |
| 1993 | 90° | 62° | 76° | — | — |
| 1992 | 79° | 39° | 59° | 0.03" | — |
| 1991 | 84° | 60° | 72° | — | — |
| 1990 | 81° | 67° | 74° | 3.18" | — |
| 1989 | 83° | 45° | 64° | — | — |
| 1988warmest | 105° | 70° | 87° | — | — |
| 1987 | 80° | 56° | 68° | 0.13" | — |
| 1986 | 77° | 57° | 67° | — | — |
| 1985 | 84° | 57° | 71° | — | — |
| 1984 | 82° | 59° | 71° | — | — |
| 1983 | 92° | 62° | 77° | — | — |
| 1982 | 86° | 55° | 71° | — | — |
| 1981 | 76° | 45° | 60° | — | — |
| 1980 | 72° | — | — | — | — |
| 1979 | 74° | 55° | 64° | 3.18" | — |
| 1978 | 85° | 64° | 74° | 0.08" | — |
| 1977coldest | 73° | 39° | 56° | — | — |
| 1976 | 79° | 49° | 64° | — | — |
| 1975 | 82° | 59° | 71° | 0.2" | — |
| 1974 | 78° | 52° | 65° | — | — |
| 1973 | 87° | 58° | 72° | — | — |
| 1972 | 94° | 73° | 83° | — | — |
| 1971 | 82° | 57° | 70° | — | — |
55 years of data from UW ARBORETUM - MADISON