March is one of the cooler months of the year in Boise, with average highs near 10.7°C and lows around -0.4°C (mean 5.1°C). It is a relatively wet time of year, averaging 47 mm of rainfall and 66% relative humidity across the period.
March is one of the cooler months of the year in Boise. Across 45 years of records, the warmest March in Boise was 2015 — when the month averaged 8.7°C — while the coldest was 2023 at 1°C. Typical March days reach 10.7°C with nights near -0.4°C. The long-term March temperature trend is broadly flat.
March is a relatively wet time of year in Boise, averaging 47 mm of rainfall. The wettest March on record was 2017 with 109 mm, while the driest was 1994 at 6 mm.
Relative humidity in Boise during March averages 66%. The most humid March was 1983 at 76%, and the least humid was 1994 at 55%.
March receives about 4 kWh/m²/day of solar energy in Boise. The sunniest Marchs were 1992 and 2021 at 4.7 kWh/m²/day, and the cloudiest was 2011 at 3.1.
Average wind speed in Boise during March is 2.3 m/s. The windiest March was 2006 at 2.8 m/s, while the calmest was 1992 at 1.7 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 4.6°C | 5.5°C | 5.2°C | 5.7°C | 4.8°C | +0.2°C |
| Avg High | 10.0°C | 11.3°C | 10.7°C | 11.1°C | 10.2°C | +0.2°C |
| Avg Low | -0.8°C | -0.3°C | -0.4°C | 0.2°C | -0.5°C | +0.3°C |
| Avg Rain | 54 mm | 38 mm | 38 mm | 55 mm | 51 mm | -3 mm |
March temperatures in Boise have risen by about 0.6°C between 1981–1985 and 2021–2025.
March has ranged from a record low of -10°C (1989) to a record high of 23.4°C (2015).
Rainfall in March is a relatively wet time of year, averaging 47 mm, with a wettest year of 109 mm.
A good time to visit Boise
March is a good time to visit Boise, with days averaging 10.7°C and nights around -0.4°C (mean 5.1°C, cooler than Boise's yearly average) and moderate rainfall. August and July are marginally more temperate, but March still suits most travellers.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 11.5°C | 6.0°C | 0.6°C | 23.3°C | -3.6°C | 51 mm | 70% | 2.3 m/s | 3.9 |
| 2024 | 9.8°C | 4.7°C | -0.5°C | 19.3°C | -8.4°C | 64 mm | 69% | 2 m/s | 4 |
| 2023 ❄️ | 5.4°C | 1.0°C | -3.4°C | 10.4°C | -7.4°C | 100 mm | 74% | 2.7 m/s | 3.4 |
| 2022 | 12.1°C | 6.4°C | 0.6°C | 22.2°C | -7.2°C | 16 mm | 64% | 2.4 m/s | 4.2 |
| 2021 | 11.4°C | 5.3°C | -0.8°C | 22.1°C | -4.4°C | 20 mm | 61% | 2.4 m/s | 4.7 |
| 2020 | 11.0°C | 5.6°C | 0.3°C | 19.3°C | -4.2°C | 52 mm | 64% | 2 m/s | 4.1 |
| 2019 | 9.9°C | 4.7°C | -0.4°C | 17.0°C | -4.8°C | 25 mm | 66% | 2 m/s | 4.1 |
| 2018 | 9.3°C | 4.2°C | -0.9°C | 18.1°C | -6.3°C | 69 mm | 68% | 2.4 m/s | 4 |
| 2017 🌧️ | 12.2°C | 7.0°C | 1.8°C | 21.0°C | -4.4°C | 109 mm | 73% | 2.3 m/s | 3.5 |
| 2016 | 11.5°C | 6.0°C | 0.6°C | 18.9°C | -3.7°C | 61 mm | 69% | 2.6 m/s | 3.8 |
| 2015 🔥 | 14.6°C | 8.7°C | 2.8°C | 23.4°C | -4.6°C | 17 mm | 58% | 2 m/s | 4.5 |
| 2014 | 11.2°C | 5.7°C | 0.2°C | 20.6°C | -4.4°C | 67 mm | 66% | 2.3 m/s | 4 |
| 2013 | 11.7°C | 5.8°C | -0.1°C | 22.1°C | -5.5°C | 16 mm | 58% | 2.3 m/s | 4.4 |
| 2012 | 11.4°C | 5.7°C | 0.0°C | 22.2°C | -6.8°C | 70 mm | 68% | 2.6 m/s | 3.4 |
| 2011 | 8.8°C | 3.9°C | -1.0°C | 17.0°C | -5.2°C | 80 mm | 74% | 2.6 m/s | 3.1 |
| 2010 | 10.8°C | 4.9°C | -1.1°C | 17.9°C | -5.6°C | 39 mm | 65% | 2.7 m/s | 4.1 |
| 2009 | 8.5°C | 3.3°C | -2.0°C | 19.5°C | -8.3°C | 45 mm | 65% | 2.6 m/s | 3.7 |
| 2008 | 8.1°C | 3.0°C | -2.0°C | 14.8°C | -5.6°C | 41 mm | 66% | 2.3 m/s | 4 |
| 2007 | 13.6°C | 7.2°C | 0.8°C | 22.1°C | -5.5°C | 14 mm | 62% | 2.3 m/s | 4.4 |
| 2006 | 8.1°C | 3.3°C | -1.4°C | 16.4°C | -6.0°C | 65 mm | 72% | 2.8 m/s | 3.5 |
| 2005 | 11.8°C | 6.1°C | 0.4°C | 20.8°C | -4.0°C | 40 mm | 58% | 2.2 m/s | 4.1 |
| 2004 | 14.2°C | 7.9°C | 1.7°C | 23.3°C | -3.3°C | 16 mm | 62% | 2.2 m/s | 4.4 |
| 2003 | 11.4°C | 6.1°C | 0.7°C | 20.8°C | -4.4°C | 50 mm | 66% | 2.3 m/s | 3.9 |
| 2002 | 8.4°C | 3.1°C | -2.2°C | 19.8°C | -9.0°C | 38 mm | 67% | 2.3 m/s | 4.2 |
| 2001 | 12.8°C | 6.7°C | 0.6°C | 20.4°C | -4.2°C | 32 mm | 61% | 2.3 m/s | 4.2 |
| 2000 | 10.6°C | 4.8°C | -1.1°C | 18.0°C | -4.2°C | 43 mm | 65% | 2.3 m/s | 4.4 |
| 1999 | 10.1°C | 4.7°C | -0.6°C | 19.9°C | -4.6°C | 20 mm | 64% | 2.6 m/s | 4 |
| 1998 | 10.6°C | 5.2°C | -0.3°C | 20.6°C | -7.2°C | 41 mm | 66% | 2.2 m/s | 4 |
| 1997 | 10.5°C | 5.0°C | -0.6°C | 21.0°C | -5.2°C | 27 mm | 67% | 2.4 m/s | 4.1 |
| 1996 | 10.7°C | 5.0°C | -0.7°C | 16.6°C | -5.1°C | 55 mm | 70% | 2.2 m/s | 4.1 |
| 1995 | 9.9°C | 4.7°C | -0.6°C | 18.2°C | -4.7°C | 68 mm | 67% | 2.4 m/s | 3.9 |
| 1994 | 13.6°C | 6.7°C | -0.2°C | 23.0°C | -4.7°C | 6 mm | 55% | 2.2 m/s | 4.6 |
| 1993 | 10.8°C | 5.3°C | -0.2°C | 20.6°C | -9.7°C | 85 mm | 75% | 1.9 m/s | 3.5 |
| 1992 | 14.9°C | 8.3°C | 1.7°C | 21.5°C | -1.5°C | 10 mm | 59% | 1.7 m/s | 4.7 |
| 1991 | 9.8°C | 4.2°C | -1.5°C | 20.5°C | -4.5°C | 47 mm | 63% | 2.6 m/s | 4.1 |
| 1990 | 12.0°C | 5.7°C | -0.5°C | 20.6°C | -5.9°C | 25 mm | 61% | 2.3 m/s | 4.5 |
| 1989 | 9.6°C | 4.3°C | -0.9°C | 17.5°C | -10.0°C | 91 mm | 75% | 2.5 m/s | 3.5 |
| 1988 | 10.3°C | 4.4°C | -1.6°C | 22.5°C | -5.3°C | 34 mm | 60% | 2.5 m/s | 4.2 |
| 1987 | 10.6°C | 5.2°C | -0.3°C | 19.8°C | -6.0°C | 43 mm | 64% | 2.4 m/s | 4.3 |
| 1986 | 13.1°C | 7.3°C | 1.4°C | 22.8°C | -3.3°C | 56 mm | 69% | 2.2 m/s | 4.3 |
| 1985 | 7.8°C | 2.4°C | -2.9°C | 15.8°C | -6.8°C | 27 mm | 69% | 2.5 m/s | 4.1 |
| 1984 | 9.1°C | 3.9°C | -1.2°C | 17.5°C | -5.8°C | 50 mm | 74% | 2.1 m/s | 3.8 |
| 1983 | 9.4°C | 4.8°C | 0.1°C | 17.0°C | -3.9°C | 90 mm | 76% | 2.5 m/s | — |
| 1982 | 8.3°C | 3.4°C | -1.4°C | 15.6°C | -4.8°C | 43 mm | 72% | 2.1 m/s | — |
| 1981 | 11.6°C | 5.8°C | 0.0°C | 17.1°C | -4.6°C | 51 mm | 63% | 2.3 m/s | — |
Actual recorded March data for each year, 1981–2025 — sourced from NASA POWER.
The average high in March is around 10.7°C with lows near -0.4°C (mean 5.1°C), based on 45 years of NASA POWER data.
March averages 47 mm of rainfall in Boise, a relatively wet time of year. The wettest on record was 109 mm in 2017.
The hottest March reached 23.4°C in 2015. The coldest dipped to -10°C in 1989.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average March temperatures have risen by about 0.6°C. Daytime highs moved from 9.2°C to 10°C and overnight lows from -1.1°C to -0.7°C over the same span.
March is one of the cooler months of the year in Boise and a relatively wet time of year, so plan for around 10.7°C daytime highs and -0.4°C at night.
Not quite — March is the 5th coolest month in Boise, averaging 5.1°C.
For March in Boise, pack warm layers and a jacket for chilly mornings, with typical highs of 10.7°C and lows of -0.4°C.
Relative humidity in March averages 66% — moderately humid.
Average wind speed in March is 2.3 m/s. The windiest March on record averaged 2.8 m/s (2006).
The wettest March on record was 2017 with 109 mm. On average, March sees 47 mm.
All figures are derived from NASA POWER (Prediction Of Worldwide Energy Resources), based on MERRA-2 satellite reanalysis, covering 1981–2025.
Explore how the weather in Boise behaves each March, based on 45 years of NASA POWER climate data from 1981 to 2025. This page breaks down average temperatures, rainfall, humidity, wind and solar radiation for March specifically, along with year-by-year records and how the month has changed over the decades.
