Ada County, ID
An ordinary day in Ada County, ID: was cooler than 44 of 75 earlier years in the county average (county average from NOAA gridded data, 1951 to 2026).
Last updated . This page normally updates every day; the latest update is late.
- High
- 74.9°F
- Coldest since 2023
- 32nd coldest of 76
- Low
- 45.9°F
- Warmest since 2025
- 33rd warmest of 76
No measurable precipitation in the county average of Ada County, ID for 10 days to Tuesday 29 September 2026 (county average from NOAA gridded data, 1951 to 2026).
- Normal range, 68.9 to 85.2°F
Every year as a table
Every 29 September low of the county average in Ada County, ID since 1951: 45.9°F in 2026; the lowest is 30.5°F, in 1999.
| Year | High, °F | Low, °F |
|---|---|---|
| 2026 | 74.9 | 45.9 |
| 2025 | 84.1 | 49.3 |
| 2024 | 87.2 | 46.8 |
| 2023 | 69.5 | 41.6 |
| 2022 | 86.2 | 52.9 |
| 2021 | 62.3 | 39.2 |
| 2020 | 74.8 | 42.8 |
| 2019 | 52.6 | 37.2 |
| 2018 | 81.4 | 46.2 |
| 2017 | 76.7 | 42.8 |
| 2016 | 88.8 | 51.4 |
| 2015 | 82.3 | 47.6 |
| 2014 | 66.2 | 51.3 |
| 2013 | 70.7 | 47.4 |
| 2012 | 82.6 | 48.8 |
| 2011 | 77.6 | 46.5 |
| 2010 | 88.9 | 49.2 |
| 2009 | 77.5 | 47.6 |
| 2008 | 83.1 | 44 |
| 2007 | 69.7 | 38 |
| 2006 | 82.6 | 45.1 |
| 2005 | 76.8 | 38.7 |
| 2004 | 82.6 | 49 |
| 2003 | 88.1 | 51.3 |
| 2002 | 71 | 40.2 |
| 2001 | 75.9 | 47.4 |
| 2000 | 80.6 | 47.2 |
| 1999 | 64.8 | 30.5 |
| 1998 | 81.3 | 47.9 |
| 1997 | 76.5 | 39.9 |
| 1996 | 83 | 45 |
| 1995 | 69.2 | 45.5 |
| 1994 | 83.7 | 51.2 |
| 1993 | 82.1 | 44.3 |
| 1992 | 84.9 | 44.3 |
| 1991 | 70.4 | 53 |
| 1990 | 82.3 | 50.3 |
| 1989 | 85.6 | 52.8 |
| 1988 | 69.1 | 37.2 |
| 1987 | 74.5 | 36.9 |
| 1986 | 57.9 | 38.8 |
| 1985 | 59.6 | 31.2 |
| 1984 | 67.4 | 34.6 |
| 1983 | 63.6 | 37.8 |
| 1982 | 57.5 | 39.2 |
| 1981 | 65.4 | 44.5 |
| 1980 | 76.4 | 44.7 |
| 1979 | 81.1 | 47.9 |
| 1978 | 77.6 | 44.8 |
| 1977 | 71.3 | 51.6 |
| 1976 | 80.8 | 48.2 |
| 1975 | 76 | 43.4 |
| 1974 | 78.8 | 37.3 |
| 1973 | 78 | 44.7 |
| 1972 | 63.7 | 34 |
| 1971 | 56.2 | 36.8 |
| 1970 | 81.7 | 41.8 |
| 1969 | 80.1 | 48.5 |
| 1968 | 74.6 | 44.5 |
| 1967 | 87.4 | 51.9 |
| 1966 | 79.6 | 47.8 |
| 1965 | 64.6 | 36 |
| 1964 | 77.6 | 43.4 |
| 1963 | 89.3 | 54.1 |
| 1962 | 62.7 | 38.5 |
| 1961 | 66.2 | 37.6 |
| 1960 | 79.8 | 48.6 |
| 1959 | 55.1 | 35.7 |
| 1958 | 77.5 | 47.1 |
| 1957 | 81.2 | 52.2 |
| 1956 | 70.4 | 36.9 |
| 1955 | 62.8 | 32.7 |
| 1954 | 60.5 | 32.9 |
| 1953 | 70.4 | 39 |
| 1952 | 80.5 | 42.7 |
| 1951 | 75.7 | 49.1 |
The month
September 2026 so far averaged 63.7°F in Ada County, ID, the coldest 1 to 29 September in the county average since 2019, tied 37th coldest of 76 (with 2019 and 1956) (county average from NOAA gridded data, 1951 to 2026).
The month in words
- August 2026 averaged 77°F in Ada County, ID, the warmest August in the county average since 2022, 4th warmest of 132 (county average from NOAA's monthly county data, 1895 to 2026).
- Tuesday 29 September 2026: a high of 74.9°F averaged over Ada County, ID, the coldest 29 September day in the county average since 2023, 32nd coldest of 76 (county average from NOAA gridded data, 1951 to 2026).
- Tuesday 29 September 2026: a low of 45.9°F averaged over Ada County, ID, the warmest 29 September night in the county average since 2025, 33rd warmest of 76 (county average from NOAA gridded data, 1951 to 2026).
- Days of the month without a value
- 0
Nearby
Boise, ID 8.0 mi, the nearest city with its own station