O'Brien County, IA
Tuesday : a low of 58.7°F averaged over O'Brien County, IA, 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
- 70.2°F
- Warmest since 2025
- 38th warmest of 76
- Low
- 58.7°F
- Warmest since 1983
- 2nd warmest of 76
No measurable precipitation in the county average of O'Brien County, IA for 2 days to Tuesday 29 September 2026 (county average from NOAA gridded data, 1951 to 2026).
- Normal range, 32.7 to 50.1°F
Every year as a table
Every 29 September high of the county average in O'Brien County, IA since 1951: 70.2°F in 2026; the highest is 87.3°F, in 2021.
| Year | High, °F | Low, °F |
|---|---|---|
| 2026 | 70.2 | 58.7 |
| 2025 | 84.9 | 49.2 |
| 2024 | 86.4 | 49.7 |
| 2023 | 79.1 | 53.2 |
| 2022 | 66.1 | 35 |
| 2021 | 87.3 | 56.4 |
| 2020 | 59.3 | 39.5 |
| 2019 | 66.3 | 43.2 |
| 2018 | 54.7 | 35.9 |
| 2017 | 76 | 45.1 |
| 2016 | 61.9 | 42.1 |
| 2015 | 77.6 | 49.7 |
| 2014 | 80.6 | 55.7 |
| 2013 | 64.3 | 44 |
| 2012 | 77.3 | 39.5 |
| 2011 | 85 | 45.8 |
| 2010 | 74.5 | 49.4 |
| 2009 | 59.8 | 36.9 |
| 2008 | 72.1 | 48.6 |
| 2007 | 74.2 | 41.3 |
| 2006 | 56.2 | 36.9 |
| 2005 | 58.2 | 33.8 |
| 2004 | 66.4 | 38.3 |
| 2003 | 56.3 | 32.6 |
| 2002 | 61.9 | 47.2 |
| 2001 | 76 | 42.3 |
| 2000 | 81 | 48.2 |
| 1999 | 64.3 | 32.3 |
| 1998 | 82.9 | 53.5 |
| 1997 | 73 | 49.1 |
| 1996 | 65.2 | 40 |
| 1995 | 79.7 | 55.4 |
| 1994 | 70.9 | 39.7 |
| 1993 | 60.4 | 32.7 |
| 1992 | 57.8 | 30.7 |
| 1991 | 71.5 | 36.1 |
| 1990 | 67.4 | 44.7 |
| 1989 | 79.2 | 45.6 |
| 1988 | 63.2 | 52.9 |
| 1987 | 71.8 | 48.5 |
| 1986 | 77.6 | 50.9 |
| 1985 | 40.8 | 34.9 |
| 1984 | 49.1 | 28 |
| 1983 | 83.2 | 59.3 |
| 1982 | 75.8 | 57.2 |
| 1981 | 73.2 | 40.4 |
| 1980 | 77.5 | 51.6 |
| 1979 | 71.3 | 42.5 |
| 1978 | 73.6 | 46.3 |
| 1977 | 70.3 | 47.1 |
| 1976 | 62.7 | 36 |
| 1975 | 66.1 | 37.7 |
| 1974 | 62.6 | 30.1 |
| 1973 | 60.6 | 52.2 |
| 1972 | 58.7 | 33.7 |
| 1971 | 72.5 | 44.6 |
| 1970 | 75.9 | 41.8 |
| 1969 | 74.9 | 47.1 |
| 1968 | 61.4 | 43.4 |
| 1967 | 67.2 | 29.3 |
| 1966 | 66 | 44.2 |
| 1965 | 62.2 | 44.1 |
| 1964 | 66.9 | 36.5 |
| 1963 | 68.9 | 38.5 |
| 1962 | 66.3 | 40.3 |
| 1961 | 62.9 | 41.8 |
| 1960 | 65.5 | 41.1 |
| 1959 | 54.3 | 35.6 |
| 1958 | 72.8 | 49.7 |
| 1957 | 74.4 | 43.5 |
| 1956 | 65.2 | 37.8 |
| 1955 | 71.7 | 50.5 |
| 1954 | 64.7 | 51.4 |
| 1953 | 77.6 | 52.2 |
| 1952 | 81.4 | 43.1 |
| 1951 | 57.3 | 37.5 |
The month
September 2026 so far averaged 66.3°F in O'Brien County, IA, the warmest 1 to 29 September in the county average since 2024, tied 6th warmest of 76 (with 2024) (county average from NOAA gridded data, 1951 to 2026).
The month in words
- August 2026 averaged 70.7°F in O'Brien County, IA, the warmest August in the county average since 2023, tied 55th warmest of 132 (with 2016, 2011 and 1928) (county average from NOAA's monthly county data, 1895 to 2026).
- Tuesday 29 September 2026: a high of 70.2°F averaged over O'Brien County, IA, 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
Spencer, IA 21.8 mi, the nearest city with its own station