Weather on September 8
Boise, ID
55 Years of Data
Avg High
83°F
Avg Low
53°F
Warmest
2024
85°F avg
Coldest
1976
55°F avg
About This Date
September 8th in Boise, ID typically brings warm fall weather, with average highs around 83°F and lows near 53°F — a 30°F daily swing. Over 55 years of records, the warmest September 8th was in 2024 (85°F average), while the coldest was 1976 (55°F) — a 30°F range across recorded history. Rain or other precipitation has occurred on about 16% of September 8th dates historically, with the wettest September 8th recording 1.8" of rain. The last decade has been 4.2°F warmer on this date compared to 20-30 years ago.
The last decade has been 4.2°F warmer on this date compared to 20-30 years ago.
Planning for September 8th 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 | 89° | 61° | 75° | — | — |
| 2024warmest | 98° | 71° | 85° | 0.05" | — |
| 2023 | 85° | 59° | 72° | — | — |
| 2022 | 85° | 56° | 70° | — | — |
| 2021 | 93° | 62° | 78° | — | — |
| 2020 | 70° | 47° | 58° | — | — |
| 2019 | 73° | 56° | 64° | 0.81" | — |
| 2018 | 85° | 63° | 74° | — | — |
| 2017 | 92° | 67° | 79° | — | — |
| 2016 | 77° | 50° | 64° | — | — |
| 2015 | 80° | 50° | 65° | — | — |
| 2014 | 89° | 59° | 74° | — | — |
| 2013 | 83° | 58° | 70° | — | — |
| 2012 | 95° | 59° | 77° | — | — |
| 2011 | 91° | 62° | 77° | — | — |
| 2010 | 68° | 55° | 62° | 0.03" | — |
| 2009 | 77° | 46° | 62° | — | — |
| 2008 | 82° | 51° | 67° | — | — |
| 2007 | 78° | 50° | 64° | — | — |
| 2006 | 88° | 65° | 76° | — | — |
| 2005 | 95° | 56° | 75° | — | — |
| 2004 | 87° | 55° | 71° | — | — |
| 2003 | 70° | 52° | 61° | 0.05" | — |
| 2002 | 74° | 44° | 59° | — | — |
| 2001 | 72° | 46° | 59° | — | — |
| 2000 | 80° | 54° | 67° | — | — |
| 1999 | 84° | 49° | 66° | — | — |
| 1998 | 87° | 64° | 76° | 0.23" | — |
| 1997 | 86° | 57° | 72° | — | — |
| 1996 | 87° | 55° | 71° | — | — |
| 1995 | 72° | 41° | 56° | — | — |
| 1994 | 93° | 56° | 74° | — | — |
| 1993 | 85° | 46° | 65° | — | — |
| 1992 | 77° | 52° | 64° | — | — |
| 1991 | 78° | 52° | 65° | 0.03" | — |
| 1990 | 91° | 60° | 76° | — | — |
| 1989 | 79° | 46° | 62° | — | — |
| 1988 | 85° | 42° | 63° | — | — |
| 1987 | 86° | 50° | 68° | — | — |
| 1986 | 72° | 52° | 62° | 1.8" | — |
| 1985 | 77° | 50° | 64° | 0.86" | — |
| 1984 | 83° | 50° | 66° | — | — |
| 1983 | 79° | 48° | 63° | — | — |
| 1982 | 92° | 55° | 73° | — | — |
| 1981 | 90° | 57° | 73° | — | — |
| 1980 | 81° | 51° | 66° | 0.05" | — |
| 1979 | 92° | 60° | 76° | — | — |
| 1978 | 68° | 41° | 55° | — | — |
| 1977 | 72° | 48° | 60° | — | — |
| 1976coldest | 73° | 37° | 55° | — | — |
| 1975 | 90° | 50° | 70° | — | — |
| 1974 | 88° | 58° | 73° | — | — |
| 1973 | 79° | 48° | 63° | — | — |
| 1972 | 87° | 54° | 70° | — | — |
| 1971 | 86° | 51° | 69° | — | — |
55 years of data from BOISE AIR TERMINAL