Washington County, WI
: September 2026 so far averaged 64.1°F in Washington County, WI, the warmest 1 to 29 September in the county average since 2024, tied 7th warmest of 76 (with 2019) (county average from NOAA gridded data, 1951 to 2026).
Last updated . This page normally updates every day; the latest update is late.
- High
- 74.7°F
- Warmest since 2025
- 13th warmest of 76
- Low
- 46.3°F
- Warmest since 2025
- 32nd warmest of 76
No measurable precipitation in the county average of Washington County, WI for 7 days to Tuesday 29 September 2026 (county average from NOAA gridded data, 1951 to 2026).
- Normal range, 54.5 to 77°F
Every year as a table
Every 29 September low of the county average in Washington County, WI since 1951: 46.3°F in 2026; the lowest is 29.3°F, in 1984 and 1951.
| Year | High, °F | Low, °F |
|---|---|---|
| 2026 | 74.7 | 46.3 |
| 2025 | 76.1 | 47.9 |
| 2024 | 76.6 | 54.3 |
| 2023 | 65 | 52.5 |
| 2022 | 56.1 | 33.1 |
| 2021 | 69.6 | 44.9 |
| 2020 | 58.4 | 42.3 |
| 2019 | 62.3 | 49.8 |
| 2018 | 53.1 | 33.7 |
| 2017 | 70.4 | 44.6 |
| 2016 | 62.3 | 49.4 |
| 2015 | 78.5 | 54.1 |
| 2014 | 78.5 | 49.7 |
| 2013 | 77.4 | 46.8 |
| 2012 | 69.1 | 39.1 |
| 2011 | 62.9 | 47.8 |
| 2010 | 68.6 | 47.3 |
| 2009 | 58.4 | 43.5 |
| 2008 | 63.6 | 49.8 |
| 2007 | 69.8 | 44.9 |
| 2006 | 56.2 | 36.9 |
| 2005 | 66.4 | 38.3 |
| 2004 | 62.5 | 37.1 |
| 2003 | 52.9 | 34.2 |
| 2002 | 69 | 46 |
| 2001 | 56.1 | 39.5 |
| 2000 | 63.8 | 40.7 |
| 1999 | 55.6 | 44.7 |
| 1998 | 73.2 | 49.3 |
| 1997 | 69.5 | 53.3 |
| 1996 | 60.4 | 47.2 |
| 1995 | 77 | 49.7 |
| 1994 | 62.3 | 40.6 |
| 1993 | 49.5 | 36.6 |
| 1992 | 54.6 | 31.3 |
| 1991 | 60.9 | 33.8 |
| 1990 | 61.7 | 44.6 |
| 1989 | 71.3 | 42.3 |
| 1988 | 62.3 | 50.4 |
| 1987 | 74.9 | 50.1 |
| 1986 | 74 | 60 |
| 1985 | 70 | 45.8 |
| 1984 | 50.5 | 29.3 |
| 1983 | 77.8 | 50.6 |
| 1982 | 69.6 | 48.9 |
| 1981 | 59 | 38.8 |
| 1980 | 64.8 | 45.9 |
| 1979 | 79.9 | 50.1 |
| 1978 | 62.9 | 43.2 |
| 1977 | 65 | 48.9 |
| 1976 | 64.4 | 41.2 |
| 1975 | 67.6 | 40.1 |
| 1974 | 64.5 | 42.2 |
| 1973 | 61 | 55.5 |
| 1972 | 65.7 | 39.9 |
| 1971 | 81 | 51.1 |
| 1970 | 59.2 | 36.3 |
| 1969 | 60.7 | 38.6 |
| 1968 | 65.9 | 42.4 |
| 1967 | 47.2 | 35.9 |
| 1966 | 61.1 | 47.2 |
| 1965 | 65.5 | 49.8 |
| 1964 | 62 | 31.7 |
| 1963 | 58.4 | 40.8 |
| 1962 | 61.8 | 35.2 |
| 1961 | 55.9 | 30.2 |
| 1960 | 60.3 | 44.9 |
| 1959 | 64.7 | 45.2 |
| 1958 | 64.5 | 40.1 |
| 1957 | 66.1 | 31.2 |
| 1956 | 71.3 | 52.6 |
| 1955 | 68.9 | 46.4 |
| 1954 | 71.3 | 54.2 |
| 1953 | 83.8 | 49.3 |
| 1952 | 76.8 | 51.3 |
| 1951 | 54.9 | 29.3 |
The month
August 2026 averaged 69.1°F in Washington County, WI, the warmest August in the county average since 2021, 44th warmest of 132 (county average from NOAA's monthly county data, 1895 to 2026).
The month in words
- Tuesday 29 September 2026: a high of 74.7°F averaged over Washington County, WI, the warmest 29 September in the county average since 2025, 13th warmest of 76 (county average from NOAA gridded data, 1951 to 2026).
- Tuesday 29 September 2026: a low of 46.3°F averaged over Washington County, WI, the warmest 29 September night in the county average since 2025, 32nd warmest of 76 (county average from NOAA gridded data, 1951 to 2026).
- Days of the month without a value
- 0
Nearby
Milwaukee, WI 34.4 mi, the nearest city with its own station