Weather on September 20
Milwaukee, WI
55 Years of Data
Avg High
72°F
Avg Low
54°F
Warmest
2021
76°F avg
Coldest
2006
48°F avg
About This Date
September 20th in Milwaukee, WI typically brings pleasant fall weather, with average highs around 72°F and lows near 54°F. Over 55 years of records, the warmest September 20th was in 2021 (76°F average), while the coldest was 2006 (48°F) — a 28°F range across recorded history. Rain or other precipitation has occurred on about 44% of September 20th dates historically, with the wettest September 20th recording 5.41" of rain. The last decade has been 5.4°F warmer on this date compared to 20-30 years ago.
The last decade has been 5.4°F warmer on this date compared to 20-30 years ago.
Planning for September 20th in Milwaukee, WI? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.
Warming Trend
2.0°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 79° | 66° | 72° | 0.2" | — |
| 2024 | 90° | 58° | 74° | 0.38" | — |
| 2023 | 70° | 58° | 64° | 0.08" | — |
| 2022 | 80° | 60° | 70° | 0.05" | — |
| 2021warmest | 80° | 71° | 76° | 0.2" | — |
| 2020 | 68° | 46° | 57° | — | — |
| 2019 | 79° | 64° | 71° | — | — |
| 2018 | 83° | 67° | 75° | 5.41" | — |
| 2017 | 86° | 58° | 72° | — | — |
| 2016 | 79° | 58° | 68° | — | — |
| 2015 | 69° | 50° | 60° | — | — |
| 2014 | 78° | 63° | 70° | 0.53" | — |
| 2013 | 75° | 60° | 68° | — | — |
| 2012 | 69° | 50° | 60° | — | — |
| 2011 | 75° | 49° | 62° | — | — |
| 2010 | 60° | 53° | 57° | 0.08" | — |
| 2009 | 75° | 53° | 64° | — | — |
| 2008 | 79° | 55° | 67° | — | — |
| 2007 | 80° | 56° | 68° | — | — |
| 2006coldest | 56° | 41° | 48° | — | — |
| 2005 | 83° | 56° | 69° | 0.41" | — |
| 2004 | 79° | 56° | 67° | — | — |
| 2003 | 67° | 43° | 55° | — | — |
| 2002 | 82° | 65° | 73° | 2.13" | — |
| 2001 | 62° | 53° | 58° | 0.2" | — |
| 2000 | 81° | 57° | 69° | — | — |
| 1999 | 81° | 49° | 65° | 1.55" | — |
| 1998 | 82° | 65° | 73° | — | — |
| 1997 | 61° | 47° | 54° | — | — |
| 1996 | 73° | 51° | 62° | 0.1" | — |
| 1995 | 59° | 48° | 54° | 0.3" | — |
| 1994 | 86° | 63° | 74° | — | — |
| 1993 | 61° | 58° | 59° | 1.88" | — |
| 1992 | 68° | 48° | 58° | 1.07" | — |
| 1991 | 59° | 39° | 49° | — | — |
| 1990 | 72° | 50° | 61° | — | — |
| 1989 | 76° | 56° | 66° | — | — |
| 1988 | 59° | 52° | 55° | 0.18" | — |
| 1987 | 58° | 52° | 55° | 1.65" | — |
| 1986 | 63° | 58° | 60° | — | — |
| 1985 | 79° | 59° | 69° | — | — |
| 1984 | 75° | 59° | 67° | — | — |
| 1983 | 74° | 45° | 59° | 1.22" | — |
| 1982 | 58° | 46° | 52° | 0.05" | — |
| 1981 | 65° | 49° | 57° | — | — |
| 1980 | 72° | 65° | 68° | 1.73" | — |
| 1979 | 79° | 52° | 65° | — | — |
| 1978 | 77° | 59° | 68° | 2.11" | — |
| 1977 | 57° | 48° | 53° | — | — |
| 1976 | 64° | 51° | 58° | 0.03" | — |
| 1975 | 56° | 50° | 53° | — | — |
| 1974 | 67° | 52° | 59° | — | — |
| 1973 | 59° | 39° | 49° | — | — |
| 1972 | 78° | 62° | 70° | 2.74" | — |
| 1971 | 66° | 51° | 59° | — | — |
55 years of data from W ALLIS