Weather on June 21
Boise, ID
55 Years of Data
Avg High
84°F
Avg Low
54°F
Warmest
1988
84°F avg
Coldest
1984
55°F avg
About This Date
June 21st in Boise, ID typically brings warm summer weather, with average highs around 84°F and lows near 54°F — a 30°F daily swing. Over 55 years of records, the warmest June 21st was in 1988 (84°F average), while the coldest was 1984 (55°F) — a 29°F range across recorded history. Rain or other precipitation has occurred on about 9% of June 21st dates historically. The last decade has been 3.0°F cooler on this date compared to 20-30 years ago.
The last decade has been 3.0°F cooler on this date compared to 20-30 years ago.
Planning for June 21st in Boise, ID? Stay hydrated and seek shade during peak afternoon hours.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 67° | 43° | 55° | — | — |
| 2024 | 94° | 56° | 75° | — | — |
| 2023 | 73° | 43° | 58° | — | — |
| 2022 | 83° | 51° | 67° | — | — |
| 2021 | 96° | 64° | 80° | — | — |
| 2020 | 82° | 60° | 71° | — | — |
| 2019 | 67° | 44° | 55° | — | — |
| 2018 | 82° | 58° | 70° | — | — |
| 2017 | 86° | 62° | 74° | — | — |
| 2016 | 83° | 60° | 71° | — | — |
| 2015 | 90° | 63° | 76° | — | — |
| 2014 | 86° | 54° | 70° | — | — |
| 2013 | 70° | 51° | 60° | — | — |
| 2012 | 96° | 59° | 78° | — | — |
| 2011 | 88° | 56° | 72° | — | — |
| 2010 | 72° | 48° | 60° | — | — |
| 2009 | 66° | 51° | 59° | — | — |
| 2008 | 101° | 65° | 83° | 0.03" | — |
| 2007 | 96° | 64° | 80° | — | — |
| 2006 | 79° | 51° | 65° | — | — |
| 2005 | 101° | 68° | 84° | — | — |
| 2004 | 86° | 56° | 71° | — | — |
| 2003 | 69° | 45° | 57° | — | — |
| 2002 | 86° | 63° | 74° | — | — |
| 2001 | 99° | 58° | 78° | — | — |
| 2000 | 92° | 56° | 74° | — | — |
| 1999 | 76° | 64° | 70° | — | — |
| 1998 | 82° | 51° | 67° | — | — |
| 1997 | 86° | 55° | 71° | — | — |
| 1996 | 69° | 51° | 60° | 0.05" | — |
| 1995 | 68° | 49° | 58° | — | — |
| 1994 | 97° | 56° | 76° | — | — |
| 1993 | 84° | 55° | 70° | 0.1" | — |
| 1992 | 96° | 60° | 78° | — | — |
| 1991 | 81° | 41° | 61° | — | — |
| 1990 | 93° | 57° | 75° | — | — |
| 1989 | 74° | 40° | 57° | — | — |
| 1988warmest | 101° | 67° | 84° | 0.05" | — |
| 1987 | 80° | 55° | 68° | — | — |
| 1986 | 77° | 48° | 63° | — | — |
| 1985 | 83° | 49° | 66° | — | — |
| 1984coldest | 66° | 44° | 55° | — | — |
| 1983 | 76° | 48° | 62° | — | — |
| 1982 | 85° | 60° | 72° | — | — |
| 1981 | 79° | 46° | 62° | — | — |
| 1980 | 90° | 54° | 72° | — | — |
| 1979 | 81° | 53° | 67° | 0.1" | — |
| 1978 | 84° | 52° | 68° | — | — |
| 1977 | 82° | 52° | 67° | — | — |
| 1976 | 74° | 52° | 63° | — | — |
| 1975 | 77° | 46° | 62° | — | — |
| 1974 | 88° | 57° | 72° | — | — |
| 1973 | 98° | 65° | 81° | — | — |
| 1972 | 80° | 54° | 67° | — | — |
| 1971 | 97° | 60° | 78° | — | — |
55 years of data from BOISE AIR TERMINAL