Weather on March 18
Boise, ID
55 Years of Data
Avg High
56°F
Avg Low
34°F
Warmest
2026
61°F avg
Coldest
2002
30°F avg
About This Date
March 18th in Boise, ID typically brings cool spring weather, with average highs around 56°F and lows near 34°F. Over 56 years of records, the warmest March 18th was in 2026 (61°F average), while the coldest was 2002 (30°F) — a 31°F range across recorded history. Precipitation has occurred on 23% of recorded March 18th dates, with snow falling 4% of the time. The last decade has been 2.5°F warmer on this date compared to 20-30 years ago.
The last decade has been 2.5°F warmer on this date compared to 20-30 years ago.
Planning for March 18th in Boise, ID? Bring layers as temperatures can vary throughout the day.
Warming Trend
0.9°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2026warmest | 80° | 42° | 61° | — | — |
| 2025 | 46° | 29° | 38° | — | — |
| 2024 | 70° | 39° | 54° | — | — |
| 2023 | 54° | 29° | 42° | — | — |
| 2022 | 60° | 35° | 48° | — | — |
| 2021 | 69° | 41° | 55° | — | — |
| 2020 | 49° | 36° | 42° | — | — |
| 2019 | 63° | 35° | 49° | — | — |
| 2018 | 51° | 35° | 43° | — | — |
| 2017 | 63° | 52° | 57° | — | — |
| 2016 | 53° | 28° | 41° | — | — |
| 2015 | 59° | 38° | 48° | — | — |
| 2014 | 48° | 26° | 37° | — | — |
| 2013 | 51° | 25° | 38° | — | — |
| 2012 | 41° | 34° | 37° | 0.43" | 0.4" |
| 2011 | 56° | 36° | 46° | — | — |
| 2010 | 55° | 33° | 44° | — | — |
| 2009 | 60° | 34° | 47° | — | — |
| 2008 | 53° | 39° | 46° | 0.41" | — |
| 2007 | 67° | 39° | 53° | — | — |
| 2006 | 49° | 32° | 40° | — | — |
| 2005 | 54° | 29° | 41° | — | — |
| 2004 | 72° | 46° | 59° | — | — |
| 2003 | 56° | 33° | 44° | — | — |
| 2002coldest | 40° | 20° | 30° | — | — |
| 2001 | 55° | 39° | 47° | — | — |
| 2000 | 54° | 30° | 42° | 0.15" | — |
| 1999 | 68° | 36° | 52° | — | — |
| 1998 | 53° | 25° | 39° | — | — |
| 1997 | 73° | 45° | 59° | — | — |
| 1996 | 57° | 30° | 44° | — | — |
| 1995 | 54° | 42° | 48° | 0.97" | — |
| 1994 | 62° | 41° | 52° | — | — |
| 1993 | 57° | 44° | 51° | 0.38" | — |
| 1992 | 57° | 28° | 43° | — | — |
| 1991 | 63° | 42° | 52° | — | — |
| 1990 | 69° | 39° | 54° | — | — |
| 1989 | 57° | 40° | 48° | 0.66" | — |
| 1988 | 62° | 29° | 45° | — | — |
| 1987 | 45° | 30° | 37° | 1.17" | — |
| 1986 | 51° | 31° | 41° | — | — |
| 1985 | 57° | 33° | 45° | — | — |
| 1984 | 50° | 26° | 38° | — | — |
| 1983 | 46° | 33° | 40° | 0.25" | — |
| 1982 | 49° | 31° | 40° | 0.81" | — |
| 1981 | 52° | 24° | 38° | — | — |
| 1980 | 49° | 33° | 41° | 0.74" | — |
| 1979 | 55° | 29° | 42° | — | — |
| 1978 | 68° | 37° | 53° | — | — |
| 1977 | 45° | 20° | 32° | 0.08" | 0.2" |
| 1976 | 59° | 39° | 49° | — | — |
| 1975 | 57° | 41° | 49° | 0.23" | — |
| 1974 | 53° | 32° | 43° | — | — |
| 1973 | 50° | 23° | 37° | — | — |
| 1972 | 57° | 44° | 51° | 1.4" | — |
| 1971 | 46° | 22° | 34° | — | — |
56 years of data from BOISE AIR TERMINAL