Weather on September 4
Boise, ID
55 Years of Data
Avg High
86°F
Avg Low
54°F
Warmest
1998
83°F avg
Coldest
2016
58°F avg
About This Date
September 4th in Boise, ID typically brings warm fall weather, with average highs around 86°F and lows near 54°F — a 32°F daily swing. Over 55 years of records, the warmest September 4th was in 1998 (83°F average), while the coldest was 2016 (58°F) — a 25°F range across recorded history. Rain or other precipitation has occurred on about 13% of September 4th dates historically, with the wettest September 4th recording 0.58" of rain. The last decade has been 3.7°F warmer on this date compared to 20-30 years ago.
The last decade has been 3.7°F warmer on this date compared to 20-30 years ago.
Planning for September 4th in Boise, ID? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
1.1°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 95° | 66° | 81° | — | — |
| 2024 | 87° | 55° | 71° | — | — |
| 2023 | 75° | 59° | 67° | 0.05" | — |
| 2022 | 98° | 60° | 79° | — | — |
| 2021 | 90° | 51° | 70° | — | — |
| 2020 | 102° | 63° | 82° | — | — |
| 2019 | 96° | 62° | 79° | — | — |
| 2018 | 88° | 54° | 71° | — | — |
| 2017 | 98° | 67° | 82° | — | — |
| 2016coldest | 65° | 51° | 58° | 0.03" | — |
| 2015 | 74° | 49° | 61° | — | — |
| 2014 | 76° | 44° | 60° | — | — |
| 2013 | 93° | 63° | 78° | 0.58" | — |
| 2012 | 86° | 53° | 70° | — | — |
| 2011 | 89° | 55° | 72° | — | — |
| 2010 | 89° | 60° | 75° | — | — |
| 2009 | 91° | 56° | 73° | — | — |
| 2008 | 78° | 50° | 64° | — | — |
| 2007 | 87° | 57° | 72° | 0.03" | — |
| 2006 | 95° | 63° | 79° | — | — |
| 2005 | 81° | 54° | 67° | — | — |
| 2004 | 76° | 46° | 61° | — | — |
| 2003 | 92° | 63° | 77° | — | — |
| 2002 | 93° | 56° | 74° | — | — |
| 2001 | 90° | 62° | 76° | — | — |
| 2000 | 73° | 47° | 60° | 0.58" | — |
| 1999 | 78° | 48° | 63° | — | — |
| 1998warmest | 99° | 67° | 83° | — | — |
| 1997 | 90° | 57° | 73° | — | — |
| 1996 | 84° | 53° | 69° | — | — |
| 1995 | 90° | 66° | 78° | — | — |
| 1994 | 73° | 44° | 59° | — | — |
| 1993 | 90° | 60° | 75° | — | — |
| 1992 | 73° | 48° | 61° | 0.03" | — |
| 1991 | 90° | 53° | 71° | — | — |
| 1990 | 98° | 58° | 78° | — | — |
| 1989 | 85° | 48° | 66° | — | — |
| 1988 | 88° | 54° | 71° | — | — |
| 1987 | 77° | 41° | 59° | — | — |
| 1986 | 90° | 55° | 72° | — | — |
| 1985 | 82° | 48° | 65° | — | — |
| 1984 | 95° | 56° | 75° | — | — |
| 1983 | 80° | 46° | 63° | — | — |
| 1982 | 77° | 52° | 64° | — | — |
| 1981 | 82° | 50° | 66° | — | — |
| 1980 | 84° | 45° | 64° | — | — |
| 1979 | 79° | 48° | 63° | — | — |
| 1978 | 93° | 63° | 78° | 0.05" | — |
| 1977 | 93° | 56° | 74° | — | — |
| 1976 | 92° | 55° | 73° | — | — |
| 1975 | 81° | 43° | 62° | — | — |
| 1974 | 90° | 55° | 72° | — | — |
| 1973 | 88° | 49° | 68° | — | — |
| 1972 | 88° | 55° | 71° | — | — |
| 1971 | 79° | 47° | 63° | — | — |
55 years of data from BOISE AIR TERMINAL