Weather on September 5
Boise, ID
55 Years of Data
Avg High
85°F
Avg Low
55°F
Warmest
1998
84°F avg
Coldest
2015
53°F avg
About This Date
September 5th in Boise, ID typically brings warm fall weather, with average highs around 85°F and lows near 55°F — a 30°F daily swing. Over 55 years of records, the warmest September 5th was in 1998 (84°F average), while the coldest was 2015 (53°F) — a 31°F range across recorded history. Rain or other precipitation has occurred on about 16% of September 5th dates historically, with the wettest September 5th recording 1.17" of rain. The last decade has been 7.2°F warmer on this date compared to 20-30 years ago.
The last decade has been 7.2°F warmer on this date compared to 20-30 years ago.
Planning for September 5th in Boise, ID? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
1.0°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 92° | 66° | 79° | — | — |
| 2024 | 95° | 63° | 79° | — | — |
| 2023 | 84° | 57° | 71° | — | — |
| 2022 | 95° | 62° | 79° | — | — |
| 2021 | 93° | 55° | 74° | — | — |
| 2020 | 100° | 64° | 82° | — | — |
| 2019 | 99° | 70° | 84° | — | — |
| 2018 | 96° | 56° | 76° | — | — |
| 2017 | 90° | 66° | 78° | — | — |
| 2016 | 71° | 44° | 58° | — | — |
| 2015coldest | 63° | 44° | 53° | — | — |
| 2014 | 81° | 49° | 65° | — | — |
| 2013 | 86° | 63° | 74° | 0.18" | — |
| 2012 | 91° | 55° | 73° | — | — |
| 2011 | 90° | 53° | 71° | — | — |
| 2010 | 68° | 48° | 58° | — | — |
| 2009 | 92° | 66° | 79° | — | — |
| 2008 | 77° | 49° | 63° | — | — |
| 2007 | 69° | 51° | 60° | 0.18" | — |
| 2006 | 95° | 65° | 80° | — | — |
| 2005 | 81° | 51° | 66° | — | — |
| 2004 | 74° | 50° | 62° | — | — |
| 2003 | 92° | 67° | 79° | — | — |
| 2002 | 88° | 59° | 73° | — | — |
| 2001 | 79° | 51° | 65° | 0.05" | — |
| 2000 | 64° | 48° | 56° | 0.13" | — |
| 1999 | 89° | 54° | 71° | — | — |
| 1998warmest | 93° | 76° | 84° | — | — |
| 1997 | 92° | 62° | 77° | 0.2" | — |
| 1996 | 64° | 47° | 55° | 0.1" | — |
| 1995 | 82° | 54° | 68° | — | — |
| 1994 | 84° | 47° | 65° | — | — |
| 1993 | 87° | 51° | 69° | — | — |
| 1992 | 64° | 50° | 57° | 0.05" | — |
| 1991 | 94° | 54° | 74° | — | — |
| 1990 | 94° | 69° | 81° | — | — |
| 1989 | 74° | 49° | 61° | — | — |
| 1988 | 90° | 60° | 75° | — | — |
| 1987 | 82° | 50° | 66° | — | — |
| 1986 | 88° | 55° | 71° | — | — |
| 1985 | 79° | 53° | 66° | — | — |
| 1984 | 88° | 63° | 75° | — | — |
| 1983 | 75° | 48° | 62° | — | — |
| 1982 | 82° | 45° | 63° | — | — |
| 1981 | 79° | 50° | 64° | — | — |
| 1980 | 92° | 50° | 71° | — | — |
| 1979 | 87° | 51° | 69° | — | — |
| 1978 | 80° | 62° | 71° | 0.2" | — |
| 1977 | 89° | 53° | 71° | — | — |
| 1976 | 92° | 54° | 73° | — | — |
| 1975 | 88° | 47° | 67° | — | — |
| 1974 | 82° | 50° | 66° | — | — |
| 1973 | 93° | 56° | 74° | — | — |
| 1972 | 76° | 55° | 65° | 1.17" | — |
| 1971 | 93° | 58° | 75° | — | — |
55 years of data from BOISE AIR TERMINAL