Weather on August 21
Green Bay, WI
55 Years of Data
Avg High
78°F
Avg Low
56°F
Warmest
1972
80°F avg
Coldest
2004
54°F avg
About This Date
August 21st in Green Bay, WI typically brings pleasant summer weather, with average highs around 78°F and lows near 56°F. Over 55 years of records, the warmest August 21st was in 1972 (80°F average), while the coldest was 2004 (54°F) — a 26°F range across recorded history. Rain or other precipitation has occurred on about 29% of August 21st dates historically, with the wettest August 21st recording 6.53" of rain. The last decade has been 2.2°F warmer on this date compared to 20-30 years ago.
The last decade has been 2.2°F warmer on this date compared to 20-30 years ago.
Planning for August 21st in Green Bay, WI? Great weather for outdoor activities.
Cooling Trend
0.4°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 77° | 57° | 67° | — | — |
| 2024 | 76° | 47° | 61° | — | — |
| 2023 | 76° | 57° | 66° | — | — |
| 2022 | 79° | 59° | 69° | — | — |
| 2021 | 84° | 64° | 74° | — | — |
| 2020 | 85° | 63° | 74° | — | — |
| 2019 | 81° | 58° | 69° | — | — |
| 2018 | 72° | 53° | 62° | 1.4" | — |
| 2017 | 80° | 62° | 71° | 0.03" | — |
| 2016 | 71° | 53° | 62° | — | — |
| 2015 | 79° | 49° | 64° | — | — |
| 2014 | 72° | 58° | 65° | 0.13" | — |
| 2013 | 87° | 65° | 76° | 4.14" | — |
| 2012 | 80° | 49° | 64° | — | — |
| 2011 | 76° | 52° | 64° | — | — |
| 2010 | 79° | 64° | 71° | — | — |
| 2009 | 68° | 56° | 62° | 0.58" | — |
| 2008 | 85° | 57° | 71° | 0.03" | — |
| 2007 | 73° | 62° | 68° | 0.05" | — |
| 2006 | 83° | 53° | 68° | — | — |
| 2005 | 73° | 51° | 62° | — | — |
| 2004coldest | 70° | 39° | 54° | — | — |
| 2003 | 85° | 61° | 73° | 1.65" | — |
| 2002 | 73° | 56° | 64° | 3.33" | — |
| 2001 | 80° | 54° | 67° | — | — |
| 2000 | 73° | 49° | 61° | — | — |
| 1999 | 81° | 53° | 67° | — | — |
| 1998 | 84° | 62° | 73° | — | — |
| 1997 | 68° | 51° | 60° | 0.03" | — |
| 1996 | 84° | 61° | 72° | — | — |
| 1995 | 86° | 60° | 73° | — | — |
| 1994 | 77° | 56° | 66° | — | — |
| 1993 | 78° | 49° | 63° | — | — |
| 1992 | 80° | 53° | 67° | — | — |
| 1991 | 80° | 53° | 67° | — | — |
| 1990 | 72° | 57° | 64° | — | — |
| 1989 | 82° | 53° | 68° | — | — |
| 1988 | 78° | 56° | 67° | — | — |
| 1987 | 81° | 63° | 72° | — | — |
| 1986 | 71° | 58° | 64° | — | — |
| 1985 | 70° | 53° | 61° | — | — |
| 1984 | 82° | 55° | 69° | 0.81" | — |
| 1983 | 72° | 61° | 66° | 6.53" | — |
| 1982 | 74° | 51° | 62° | — | — |
| 1981 | 80° | 49° | 64° | — | — |
| 1980 | 80° | 63° | 71° | — | — |
| 1979 | 78° | 59° | 69° | — | — |
| 1978 | 81° | 53° | 67° | — | — |
| 1977 | 73° | 50° | 62° | 0.79" | — |
| 1976 | 87° | 58° | 72° | — | — |
| 1975 | 82° | 64° | 73° | 0.1" | — |
| 1974 | 87° | 67° | 77° | 0.46" | — |
| 1973 | 72° | 50° | 61° | — | — |
| 1972warmest | 90° | 70° | 80° | 0.08" | — |
| 1971 | 82° | 57° | 70° | — | — |
55 years of data from GREEN BAY