Weather on August 9
Boise, ID
55 Years of Data
Avg High
93°F
Avg Low
61°F
Warmest
2018
87°F avg
Coldest
1985
61°F avg
About This Date
August 9th in Boise, ID typically brings hot summer weather, with average highs around 93°F and lows near 61°F — a 32°F daily swing. Over 55 years of records, the warmest August 9th was in 2018 (87°F average), while the coldest was 1985 (61°F) — a 26°F range across recorded history. Rain or other precipitation has occurred on about 4% of August 9th dates historically. The last decade has been 1.2°F cooler on this date compared to 20-30 years ago.
The last decade has been 1.2°F cooler on this date compared to 20-30 years ago.
Planning for August 9th in Boise, ID? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
0.7°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 86° | 57° | 72° | — | — |
| 2024 | 97° | 71° | 84° | — | — |
| 2023 | 93° | 65° | 79° | — | — |
| 2022 | 99° | 76° | 87° | — | — |
| 2021 | 83° | 53° | 68° | — | — |
| 2020 | 88° | 58° | 73° | — | — |
| 2019 | 93° | 64° | 79° | 0.15" | — |
| 2018warmest | 106° | 69° | 87° | — | — |
| 2017 | 92° | 65° | 78° | — | — |
| 2016 | 75° | 57° | 66° | — | — |
| 2015 | 94° | 65° | 79° | — | — |
| 2014 | 93° | 65° | 79° | — | — |
| 2013 | 97° | 64° | 80° | — | — |
| 2012 | 98° | 65° | 81° | — | — |
| 2011 | 92° | 63° | 77° | — | — |
| 2010 | 90° | 67° | 78° | 0.18" | — |
| 2009 | 83° | 58° | 70° | — | — |
| 2008 | 92° | 68° | 80° | — | — |
| 2007 | 94° | 61° | 77° | — | — |
| 2006 | 85° | 61° | 73° | — | — |
| 2005 | 99° | 71° | 85° | — | — |
| 2004 | 94° | 60° | 77° | — | — |
| 2003 | 98° | 64° | 81° | — | — |
| 2002 | 83° | 55° | 69° | — | — |
| 2001 | 93° | 68° | 81° | — | — |
| 2000 | 102° | 67° | 84° | — | — |
| 1999 | 96° | 58° | 77° | — | — |
| 1998 | 97° | 66° | 81° | — | — |
| 1997 | 87° | 54° | 70° | — | — |
| 1996 | 98° | 62° | 80° | — | — |
| 1995 | 88° | 47° | 67° | — | — |
| 1994 | 91° | 53° | 72° | — | — |
| 1993 | 91° | 56° | 73° | — | — |
| 1992 | 90° | 51° | 70° | — | — |
| 1991 | 100° | 67° | 83° | — | — |
| 1990 | 100° | 68° | 84° | — | — |
| 1989 | 90° | 67° | 78° | — | — |
| 1988 | 95° | 58° | 76° | — | — |
| 1987 | 100° | 61° | 80° | — | — |
| 1986 | 98° | 60° | 79° | — | — |
| 1985coldest | 79° | 43° | 61° | — | — |
| 1984 | 101° | 60° | 80° | — | — |
| 1983 | 93° | 69° | 81° | — | — |
| 1982 | 94° | 63° | 78° | — | — |
| 1981 | 94° | 62° | 78° | — | — |
| 1980 | 84° | 49° | 66° | — | — |
| 1979 | 93° | 58° | 75° | — | — |
| 1978 | 99° | 64° | 81° | — | — |
| 1977 | 92° | 60° | 76° | — | — |
| 1976 | 79° | 48° | 63° | — | — |
| 1975 | 92° | 56° | 74° | — | — |
| 1974 | 81° | 48° | 64° | — | — |
| 1973 | 94° | 59° | 76° | — | — |
| 1972 | 101° | 66° | 83° | — | — |
| 1971 | 103° | 62° | 82° | — | — |
55 years of data from BOISE AIR TERMINAL