Weather on August 15
Boise, ID
55 Years of Data
Avg High
90°F
Avg Low
60°F
Warmest
2023
88°F avg
Coldest
1976
60°F avg
About This Date
August 15th in Boise, ID typically brings hot summer weather, with average highs around 90°F and lows near 60°F — a 30°F daily swing. Over 55 years of records, the warmest August 15th was in 2023 (88°F average), while the coldest was 1976 (60°F) — a 28°F range across recorded history. Rain or other precipitation has occurred on about 11% of August 15th dates historically, with the wettest August 15th recording 0.61" of rain. The last decade has been 1.2°F warmer on this date compared to 20-30 years ago.
The last decade has been 1.2°F warmer on this date compared to 20-30 years ago.
Planning for August 15th in Boise, ID? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
1.3°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 92° | 62° | 77° | — | — |
| 2024 | 87° | 63° | 75° | — | — |
| 2023warmest | 104° | 71° | 88° | — | — |
| 2022 | 99° | 62° | 80° | — | — |
| 2021 | 98° | 66° | 82° | — | — |
| 2020 | 98° | 58° | 78° | — | — |
| 2019 | 90° | 60° | 75° | — | — |
| 2018 | 98° | 63° | 80° | — | — |
| 2017 | 87° | 55° | 71° | — | — |
| 2016 | 99° | 65° | 82° | — | — |
| 2015 | 83° | 58° | 70° | — | — |
| 2014 | 87° | 62° | 75° | — | — |
| 2013 | 99° | 61° | 80° | — | — |
| 2012 | 97° | 64° | 80° | — | — |
| 2011 | 82° | 61° | 71° | — | — |
| 2010 | 92° | 63° | 77° | — | — |
| 2009 | 73° | 48° | 61° | — | — |
| 2008 | 93° | 68° | 81° | — | — |
| 2007 | 100° | 63° | 81° | — | — |
| 2006 | 92° | 65° | 78° | — | — |
| 2005 | 92° | 57° | 74° | — | — |
| 2004 | 93° | 67° | 80° | — | — |
| 2003 | 97° | 70° | 83° | — | — |
| 2002 | 95° | 58° | 76° | — | — |
| 2001 | 98° | 74° | 86° | — | — |
| 2000 | 91° | 60° | 76° | — | — |
| 1999 | 78° | 48° | 63° | — | — |
| 1998 | 96° | 67° | 81° | — | — |
| 1997 | 90° | 61° | 75° | — | — |
| 1996 | 98° | 66° | 82° | — | — |
| 1995 | 95° | 58° | 76° | — | — |
| 1994 | 95° | 58° | 76° | — | — |
| 1993 | 69° | 52° | 60° | 0.08" | — |
| 1992 | 93° | 75° | 84° | — | — |
| 1991 | 90° | 68° | 79° | 0.05" | — |
| 1990 | 95° | 69° | 82° | — | — |
| 1989 | 83° | 56° | 69° | — | — |
| 1988 | 83° | 52° | 67° | — | — |
| 1987 | 75° | 46° | 61° | — | — |
| 1986 | 97° | 59° | 78° | — | — |
| 1985 | 87° | 55° | 71° | — | — |
| 1984 | 93° | 62° | 78° | — | — |
| 1983 | 78° | 63° | 70° | 0.13" | — |
| 1982 | 89° | 54° | 71° | — | — |
| 1981 | 96° | 62° | 79° | — | — |
| 1980 | 82° | 59° | 71° | — | — |
| 1979 | 83° | 57° | 70° | — | — |
| 1978 | 89° | 52° | 70° | 0.33" | — |
| 1977 | 96° | 61° | 78° | — | — |
| 1976coldest | 70° | 51° | 60° | 0.61" | — |
| 1975 | 93° | 57° | 75° | — | — |
| 1974 | 87° | 52° | 69° | — | — |
| 1973 | 97° | 59° | 78° | — | — |
| 1972 | 84° | 65° | 74° | 0.13" | — |
| 1971 | 95° | 59° | 77° | — | — |
55 years of data from BOISE AIR TERMINAL