Basilemorin / CC0
Boise, ID Weather on April 9
Boise hits 78°F record on April 9, 2016 despite cool typical spring day
April 9 in Boise typically brings mild spring conditions with average highs near 59°F and lows around 37°F, but the extremes tell a more dramatic story across 55 years of records. The date's record high of 78°F set in 2016 is a striking 19 degrees above normal, while the coldest April 9 on record dropped to 23°F in 1987, showing the unpredictability of Boise's transitional spring weather. This 55-degree span between record extremes illustrates how rapidly spring conditions can shift in the intermountain region.
What to Expect on April 9
Planning for April 9th in Boise, ID? Bring layers as temperatures can vary throughout the day.
Frequently Asked Questions
What was the warmest April 9 ever in Boise?
The warmest April 9 in Boise, ID reached 78°F in 2016. That is 19°F above the long-term average high of 59°F.
What was the coldest April 9 ever in Boise?
The coldest April 9 in Boise, ID dropped to 23°F in 1987. That is 14°F below the long-term average low of 37°F.
What is the average temperature on April 9 in Boise?
On April 9, Boise averages a high of 59°F and a low of 37°F based on 55 years of NOAA weather observations from BOISE AIR TERMINAL.
How many years of weather data are available for April 9 in Boise?
We have 55 years of weather records for April 9 in Boise, ID, sourced from NOAA's Global Historical Climatology Network. Records include daily high and low temperatures, precipitation, and snowfall data going back to 2025.
April 9 Weather History in Boise
| Year | High | Low | Precip | Snow |
|---|---|---|---|---|
| 2025 | 67°F | 41°F | 0" | -- |
| 2024 | 66°F | 40°F | 0" | -- |
| 2023 | 73°F | 42°F | 0" | -- |
| 2022 | 51°F | 32°F | 0" | -- |
| 2021 | 62°F | 28°F | 0" | -- |
| 2020 | 71°F | 39°F | 0" | -- |
| 2019 | 55°F | 43°F | 0.1" | -- |
| 2018 | 62°F | 34°F | 0" | -- |
| 2017 | 52°F | 29°F | 0" | -- |
| 2016 | 78°F | 48°F | 0" | -- |
| 2015 | 61°F | 33°F | 0" | -- |
| 2014 | 70°F | 44°F | 0" | -- |
| 2013 | 62°F | 37°F | 0" | -- |
| 2012 | 71°F | 44°F | 0" | -- |
| 2011 | 54°F | 37°F | 0.03" | -- |
| 2010 | 48°F | 25°F | 0" | -- |
| 2009 | 59°F | 40°F | 0" | -- |
| 2008 | 51°F | 33°F | 0.25" | -- |
| 2007 | 55°F | 38°F | 0.18" | -- |
| 2006 | 54°F | 37°F | 0" | -- |
| 2005 | 56°F | 36°F | 0" | -- |
| 2004 | 67°F | 40°F | 0" | -- |
| 2003 | 70°F | 42°F | 0" | -- |
| 2002 | 61°F | 46°F | 0.38" | -- |
| 2001 | 50°F | 26°F | 0" | -- |
| 2000 | 58°F | 45°F | 0.64" | -- |
| 1999 | 45°F | 28°F | 0" | -- |
| 1998 | 59°F | 42°F | 0.05" | -- |
| 1997 | 61°F | 31°F | 0" | -- |
| 1996 | 74°F | 52°F | 0" | -- |
| 1995 | 50°F | 34°F | 0.03" | -- |
| 1994 | 50°F | 42°F | 0.64" | -- |
| 1993 | 55°F | 37°F | 0" | -- |
| 1992 | 61°F | 45°F | 0.28" | -- |
| 1991 | 54°F | 35°F | 0.46" | -- |
| 1990 | 63°F | 30°F | 0" | -- |
| 1989 | 59°F | 33°F | 0" | -- |
| 1988 | 57°F | 28°F | 0" | -- |
| 1987 | 58°F | 23°F | 0" | -- |
| 1986 | 64°F | 40°F | 0" | -- |
| 1985 | 74°F | 44°F | 0" | -- |
| 1984 | 46°F | 31°F | 0" | -- |
| 1983 | 56°F | 41°F | 0" | -- |
| 1982 | 54°F | 32°F | 0" | -- |
| 1981 | 52°F | 33°F | 0" | -- |
| 1980 | 56°F | 38°F | 0.03" | -- |
| 1979 | 52°F | 33°F | 1.19" | -- |
| 1978 | 62°F | 36°F | 0" | -- |
| 1977 | 59°F | 38°F | 0" | -- |
| 1976 | 59°F | 44°F | 0" | -- |
| 1975 | 48°F | 35°F | 0.25" | 0.3" |
| 1974 | 59°F | 40°F | 0.53" | -- |
| 1973 | 63°F | 41°F | 0" | -- |
| 1972 | 54°F | 35°F | 0" | -- |
| 1971 | 68°F | 45°F | 0" | -- |
Based on 55 years of data from NOAA station: BOISE AIR TERMINAL
How Has April 9 Changed?
The last decade has been 1.5°F warmer on this date compared to 20-30 years ago.
Monthly Climate Averages
Historical temperature and precipitation averages for Boise, ID, based on 55+ years of weather data.
Temperatures in Fahrenheit. Precipitation and snowfall in inches.