Weather on May 20
Boise, ID
55 Years of Data
About This Date
May 20th in Boise, ID typically brings pleasant spring weather, with average highs around 71°F and lows near 46°F — a 25°F daily swing. Over 56 years of records, the warmest May 20th was in 2023 (76°F average), while the coldest was 1971 (43°F) — a 33°F range across recorded history. Rain or other precipitation has occurred on about 36% of May 20th dates historically, with the wettest May 20th recording 2.03" of rain. The last decade has been 1.5°F cooler on this date compared to 20-30 years ago.
The last decade has been 1.5°F cooler on this date compared to 20-30 years ago.
Planning for May 20th in Boise, ID? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2026 | 75° | 47° | 61° | — | — |
| 2025 | 66° | 46° | 56° | — | — |
| 2024 | 68° | 43° | 55° | — | — |
| 2023warmest | 92° | 60° | 76° | — | — |
| 2022 | 65° | 38° | 51° | — | — |
| 2021 | 63° | 40° | 51° | — | — |
| 2020 | 51° | 45° | 48° | 2.03" | — |
| 2019 | 62° | 48° | 55° | 0.99" | — |
| 2018 | 72° | 56° | 64° | 0.51" | — |
| 2017 | 77° | 52° | 64° | — | — |
| 2016 | 55° | 45° | 50° | 0.2" | — |
| 2015 | 70° | 54° | 62° | 0.23" | — |
| 2014 | 75° | 42° | 59° | — | — |
| 2013 | 74° | 43° | 58° | — | — |
| 2012 | 84° | 56° | 70° | — | — |
| 2011 | 76° | 49° | 62° | — | — |
| 2010 | 60° | 43° | 51° | 0.18" | — |
| 2009 | 68° | 45° | 56° | — | — |
| 2008 | 88° | 48° | 68° | 0.84" | — |
| 2007 | 71° | 52° | 61° | 0.08" | — |
| 2006 | 78° | 59° | 69° | 0.74" | — |
| 2005 | 68° | 49° | 58° | 0.18" | — |
| 2004 | 70° | 45° | 57° | 0.18" | — |
| 2003 | 74° | 43° | 58° | — | — |
| 2002 | 61° | 44° | 52° | — | — |
| 2001 | 67° | 45° | 56° | — | — |
| 2000 | 79° | 49° | 64° | — | — |
| 1999 | 78° | 53° | 66° | 0.1" | — |
| 1998 | 71° | 46° | 59° | — | — |
| 1997 | 83° | 52° | 67° | — | — |
| 1996 | 64° | 39° | 52° | — | — |
| 1995 | 80° | 43° | 61° | — | — |
| 1994 | 63° | 49° | 56° | 0.18" | — |
| 1993 | 83° | 59° | 71° | 0.1" | — |
| 1992 | 69° | 51° | 60° | — | — |
| 1991 | 66° | 44° | 55° | — | — |
| 1990 | 65° | 48° | 56° | 0.56" | — |
| 1989 | 75° | 42° | 59° | — | — |
| 1988 | 80° | 40° | 60° | — | — |
| 1987 | 65° | 38° | 51° | — | — |
| 1986 | 80° | 54° | 67° | 0.13" | — |
| 1985 | 70° | 47° | 58° | 1.42" | — |
| 1984 | 70° | 47° | 58° | — | — |
| 1983 | 73° | 40° | 56° | — | — |
| 1982 | 74° | 34° | 54° | — | — |
| 1981 | 65° | 48° | 56° | 0.71" | — |
| 1980 | 88° | 53° | 70° | — | — |
| 1979 | 80° | 40° | 60° | — | — |
| 1978 | 78° | 45° | 61° | — | — |
| 1977 | 70° | 40° | 55° | — | — |
| 1976 | 66° | 34° | 50° | — | — |
| 1975 | 66° | 38° | 52° | — | — |
| 1974 | 63° | 45° | 54° | — | — |
| 1973 | 67° | 48° | 57° | 0.03" | — |
| 1972 | 75° | 51° | 63° | 0.18" | — |
| 1971coldest | 54° | 33° | 43° | — | — |
Boise, ID Temperature Range by Month
Average monthly highs and lows. The shaded band shows the typical daily temperature range.
Boise, ID Monthly Precipitation
Average rainfall and snowfall per month, in inches.
Boise, ID Daily Temperature Calendar
Average daily high temperature for every day of the year. Each cell is the climatological mean for that calendar day across 55 years of NOAA data.
Best Time to Visit Boise, ID
Boise, ID has no months that meet our "pleasant" threshold — every season has tradeoffs.