Weather on May 9
Boise, ID
55 Years of Data
Avg High
68°F
Avg Low
43°F
Warmest
2025
72°F avg
Coldest
2022
39°F avg
About This Date
May 9th in Boise, ID typically brings mild spring weather, with average highs around 68°F and lows near 43°F — a 25°F daily swing. Over 55 years of records, the warmest May 9th was in 2025 (72°F average), while the coldest was 2022 (39°F) — a 33°F range across recorded history. Precipitation has occurred on 24% of recorded May 9th dates, with snow falling 2% of the time. The last decade has been 3.4°F warmer on this date compared to 20-30 years ago.
The last decade has been 3.4°F warmer on this date compared to 20-30 years ago.
Planning for May 9th in Boise, ID? Great weather for outdoor activities.
Warming Trend
0.4°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025warmest | 88° | 57° | 72° | — | — |
| 2024 | 75° | 38° | 56° | — | — |
| 2023 | 62° | 42° | 52° | 0.48" | — |
| 2022coldest | 44° | 33° | 39° | 0.66" | 0.5" |
| 2021 | 63° | 36° | 49° | — | — |
| 2020 | 81° | 48° | 64° | — | — |
| 2019 | 68° | 49° | 58° | — | — |
| 2018 | 79° | 56° | 67° | — | — |
| 2017 | 74° | 44° | 59° | — | — |
| 2016 | 61° | 46° | 53° | — | — |
| 2015 | 76° | 45° | 60° | — | — |
| 2014 | 63° | 45° | 54° | 0.69" | — |
| 2013 | 84° | 52° | 68° | — | — |
| 2012 | 82° | 49° | 65° | — | — |
| 2011 | 62° | 39° | 51° | — | — |
| 2010 | 67° | 41° | 54° | — | — |
| 2009 | 67° | 38° | 52° | — | — |
| 2008 | 63° | 42° | 52° | — | — |
| 2007 | 85° | 54° | 69° | — | — |
| 2006 | 60° | 34° | 47° | — | — |
| 2005 | 60° | 45° | 52° | 1.14" | — |
| 2004 | 69° | 45° | 57° | — | — |
| 2003 | 55° | 45° | 50° | 0.03" | — |
| 2002 | 63° | 43° | 53° | — | — |
| 2001 | 70° | 47° | 58° | — | — |
| 2000 | 62° | 49° | 55° | 0.36" | — |
| 1999 | 52° | 29° | 40° | — | — |
| 1998 | 62° | 47° | 54° | — | — |
| 1997 | 84° | 46° | 65° | — | — |
| 1996 | 66° | 35° | 51° | — | — |
| 1995 | 72° | 44° | 58° | 0.03" | — |
| 1994 | 86° | 48° | 67° | — | — |
| 1993 | 69° | 37° | 53° | — | — |
| 1992 | 65° | 41° | 53° | — | — |
| 1991 | 56° | 37° | 46° | — | — |
| 1990 | 71° | 33° | 52° | — | — |
| 1989 | 83° | 53° | 68° | 0.08" | — |
| 1988 | 67° | 44° | 55° | — | — |
| 1987 | 87° | 52° | 69° | — | — |
| 1986 | 65° | 39° | 52° | 0.1" | — |
| 1985 | 69° | 39° | 54° | — | — |
| 1984 | 66° | 51° | 59° | — | — |
| 1983 | 49° | 37° | 43° | — | — |
| 1982 | 56° | 37° | 46° | 0.08" | — |
| 1981 | 72° | 38° | 55° | — | — |
| 1980 | 55° | 44° | 50° | 0.28" | — |
| 1979 | 61° | 39° | 50° | — | — |
| 1978 | 78° | 48° | 63° | 0.38" | — |
| 1977 | 66° | 40° | 53° | 0.2" | — |
| 1976 | 80° | 48° | 64° | — | — |
| 1975 | 73° | 50° | 62° | — | — |
| 1974 | 65° | 50° | 57° | — | — |
| 1973 | 67° | 44° | 55° | — | — |
| 1972 | 63° | 33° | 48° | — | — |
| 1971 | 72° | 47° | 59° | — | — |
55 years of data from BOISE AIR TERMINAL