Weather on May 15
Boise, ID
55 Years of Data
Avg High
72°F
Avg Low
47°F
Warmest
2006
75°F avg
Coldest
1984
40°F avg
About This Date
May 15th in Boise, ID typically brings pleasant spring weather, with average highs around 72°F and lows near 47°F — a 25°F daily swing. Over 55 years of records, the warmest May 15th was in 2006 (75°F average), while the coldest was 1984 (40°F) — a 35°F range across recorded history. Rain or other precipitation has occurred on about 36% of May 15th dates historically, with the wettest May 15th recording 0.74" of rain. The last decade has been 2.3°F warmer on this date compared to 20-30 years ago.
The last decade has been 2.3°F warmer on this date compared to 20-30 years ago.
Planning for May 15th in Boise, ID? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.
Warming Trend
0.9°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 65° | 40° | 52° | — | — |
| 2024 | 78° | 47° | 62° | — | — |
| 2023 | 82° | 53° | 68° | 0.61" | — |
| 2022 | 85° | 50° | 67° | — | — |
| 2021 | 77° | 52° | 64° | — | — |
| 2020 | 65° | 45° | 55° | 0.03" | — |
| 2019 | 71° | 56° | 63° | — | — |
| 2018 | 78° | 56° | 67° | 0.48" | — |
| 2017 | 64° | 36° | 50° | — | — |
| 2016 | 62° | 51° | 57° | 0.46" | — |
| 2015 | 59° | 51° | 55° | 0.48" | — |
| 2014 | 85° | 52° | 68° | — | — |
| 2013 | 79° | 50° | 64° | — | — |
| 2012 | 81° | 56° | 68° | — | — |
| 2011 | 60° | 41° | 51° | 0.71" | — |
| 2010 | 80° | 51° | 66° | — | — |
| 2009 | 69° | 41° | 55° | — | — |
| 2008 | 82° | 55° | 69° | — | — |
| 2007 | 86° | 52° | 69° | — | — |
| 2006warmest | 93° | 57° | 75° | — | — |
| 2005 | 68° | 57° | 63° | 0.46" | — |
| 2004 | 71° | 49° | 60° | 0.48" | — |
| 2003 | 73° | 49° | 61° | — | — |
| 2002 | 69° | 41° | 55° | — | — |
| 2001 | 56° | 50° | 53° | 0.33" | — |
| 2000 | 76° | 44° | 60° | — | — |
| 1999 | 58° | 34° | 46° | — | — |
| 1998 | 55° | 41° | 48° | 0.46" | — |
| 1997 | 89° | 57° | 73° | — | — |
| 1996 | 70° | 56° | 63° | 0.64" | — |
| 1995 | 73° | 45° | 59° | 0.46" | — |
| 1994 | 78° | 53° | 66° | — | — |
| 1993 | 83° | 55° | 69° | — | — |
| 1992 | 82° | 62° | 72° | — | — |
| 1991 | 70° | 35° | 52° | — | — |
| 1990 | 63° | 28° | 45° | — | — |
| 1989 | 74° | 39° | 56° | — | — |
| 1988 | 91° | 43° | 67° | — | — |
| 1987 | 84° | 62° | 73° | 0.03" | — |
| 1986 | 62° | 32° | 47° | — | — |
| 1985 | 58° | 38° | 48° | 0.08" | — |
| 1984coldest | 45° | 36° | 40° | 0.15" | — |
| 1983 | 57° | 40° | 48° | 0.05" | — |
| 1982 | 70° | 47° | 58° | — | — |
| 1981 | 59° | 43° | 51° | 0.38" | — |
| 1980 | 65° | 47° | 56° | 0.74" | — |
| 1979 | 86° | 53° | 70° | — | — |
| 1978 | 71° | 44° | 58° | 0.05" | — |
| 1977 | 61° | 38° | 49° | — | — |
| 1976 | 73° | 33° | 53° | — | — |
| 1975 | 77° | 55° | 66° | — | — |
| 1974 | 53° | 31° | 42° | — | — |
| 1973 | 90° | 51° | 70° | — | — |
| 1972 | 83° | 57° | 70° | — | — |
| 1971 | 79° | 50° | 64° | 0.05" | — |
55 years of data from BOISE AIR TERMINAL