Union County, SD
Tuesday : a low of 61.5°F averaged over Union County, SD, the warmest 29 September night in the county average since 1983, 2nd warmest of 76 (county average from NOAA gridded data, 1951 to 2026).
Last updated . This page normally updates every day; the latest update is late.
- High
- 70.9°F
- Warmest since 2025
- 38th warmest of 76
- Low
- 61.5°F
- Warmest since 1983
- 2nd warmest of 76
No measurable precipitation in the county average of Union County, SD for 2 days to Tuesday 29 September 2026 (county average from NOAA gridded data, 1951 to 2026).
- Normal range, 33.9 to 51.1°F
Every year as a table
Every 29 September high of the county average in Union County, SD since 1951: 70.9°F in 2026; the highest is 90.7°F, in 2021.
| Year | High, °F | Low, °F |
|---|---|---|
| 2026 | 70.9 | 61.5 |
| 2025 | 85.7 | 48.2 |
| 2024 | 88.5 | 49.5 |
| 2023 | 83.3 | 53.7 |
| 2022 | 69.3 | 38.4 |
| 2021 | 90.7 | 59.5 |
| 2020 | 62.1 | 38.7 |
| 2019 | 66.7 | 43.7 |
| 2018 | 54.9 | 37.4 |
| 2017 | 76.3 | 44.2 |
| 2016 | 64 | 40 |
| 2015 | 76.2 | 49 |
| 2014 | 81.1 | 57.9 |
| 2013 | 69.7 | 44.8 |
| 2012 | 78.4 | 36.2 |
| 2011 | 83.9 | 45.1 |
| 2010 | 76.1 | 50 |
| 2009 | 62.7 | 34.9 |
| 2008 | 74.6 | 46.3 |
| 2007 | 77 | 41.7 |
| 2006 | 58.2 | 38 |
| 2005 | 62.3 | 34.1 |
| 2004 | 69 | 38.2 |
| 2003 | 58.5 | 33.9 |
| 2002 | 63.4 | 48.6 |
| 2001 | 76.9 | 44.5 |
| 2000 | 83.6 | 48.9 |
| 1999 | 66.1 | 31.7 |
| 1998 | 85.6 | 52.8 |
| 1997 | 74.2 | 50.9 |
| 1996 | 67.7 | 41.2 |
| 1995 | 81.6 | 57.2 |
| 1994 | 74 | 40.7 |
| 1993 | 63.1 | 33.4 |
| 1992 | 58.7 | 33.4 |
| 1991 | 76 | 40.2 |
| 1990 | 68.1 | 47.1 |
| 1989 | 80 | 44 |
| 1988 | 64.4 | 55.7 |
| 1987 | 73.2 | 47.8 |
| 1986 | 80.7 | 50 |
| 1985 | 40.1 | 35.8 |
| 1984 | 50.4 | 24.4 |
| 1983 | 85.2 | 62.3 |
| 1982 | 81.3 | 58.2 |
| 1981 | 76 | 43.3 |
| 1980 | 79.1 | 53.2 |
| 1979 | 72.9 | 43.3 |
| 1978 | 77.6 | 47.4 |
| 1977 | 72.6 | 50.2 |
| 1976 | 63.3 | 34.6 |
| 1975 | 65.5 | 38.5 |
| 1974 | 63.3 | 33.3 |
| 1973 | 61.7 | 51.4 |
| 1972 | 58.7 | 34.7 |
| 1971 | 74.3 | 45.8 |
| 1970 | 79.1 | 42.4 |
| 1969 | 76 | 47.9 |
| 1968 | 65.9 | 44.5 |
| 1967 | 69 | 31.6 |
| 1966 | 66.6 | 45.2 |
| 1965 | 57.7 | 44.9 |
| 1964 | 67.8 | 36.8 |
| 1963 | 70.7 | 39.7 |
| 1962 | 66.2 | 43.7 |
| 1961 | 67.9 | 40.2 |
| 1960 | 69 | 43.1 |
| 1959 | 57.6 | 38.2 |
| 1958 | 75.8 | 47.9 |
| 1957 | 75.7 | 46.7 |
| 1956 | 68.6 | 40.9 |
| 1955 | 74.4 | 48.1 |
| 1954 | 69 | 50.1 |
| 1953 | 79.7 | 53.2 |
| 1952 | 82 | 44.4 |
| 1951 | 62.3 | 36 |
The month
September 2026 so far averaged 68.2°F in Union County, SD, the warmest 1 to 29 September in the county average since 2005, 3rd warmest of 76 (county average from NOAA gridded data, 1951 to 2026).
The month in words
- August 2026 averaged 72.3°F in Union County, SD, the warmest August in the county average since 2023, tied 59th warmest of 132 (with 1961) (county average from NOAA's monthly county data, 1895 to 2026).
- Tuesday 29 September 2026: a high of 70.9°F averaged over Union County, SD, the warmest 29 September in the county average since 2025, 38th warmest of 76 (county average from NOAA gridded data, 1951 to 2026).
- Days of the month without a value
- 0
Nearby
Sioux City, IA 33.3 mi, the nearest city with its own station