June is one of the warmer months of the year in Boise, with average highs near 26.5°C and lows around 11.6°C (mean 19.1°C). It is one of the drier months, averaging 24 mm of rainfall and 45% relative humidity across the period.
June is one of the warmer months of the year in Boise. Across 45 years of records, the warmest June in Boise was 2015 — when the month averaged 23.6°C — while the coldest was 1993 at 15.6°C. Typical June days reach 26.5°C with nights near 11.6°C. The long-term trend is warming, about 0.3°C per decade.
June is one of the drier months in Boise, averaging 24 mm of rainfall. The wettest June on record was 2020 with 80 mm, while the driest was 1994 at 3 mm.
Relative humidity in Boise during June averages 45%. The most humid June was 2023 at 56%, and the least humid was 1994 at 35%.
June receives about 7.5 kWh/m²/day of solar energy in Boise. The sunniest Junes were 2003 and 2021 at 8.4 kWh/m²/day, and the cloudiest was 1993 at 6.5.
Average wind speed in Boise during June is 2.2 m/s. The windiest June was 2014 at 2.6 m/s, while the calmest was 2023 at 1.7 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 19.2°C | 17.8°C | 19.3°C | 19.3°C | 19.9°C | +0.7°C |
| Avg High | 26.8°C | 25.1°C | 26.9°C | 26.7°C | 27.2°C | +0.4°C |
| Avg Low | 11.6°C | 10.6°C | 11.8°C | 11.8°C | 12.6°C | +1°C |
| Avg Rain | 21 mm | 29 mm | 21 mm | 17 mm | 35 mm | +14 mm |
June temperatures in Boise have risen by about 2.6°C between 1981–1985 and 2021–2025.
June has ranged from a record low of 1.9°C (1981) to a record high of 42.2°C (2015).
Rainfall in June is one of the drier months, averaging 24 mm, with a wettest year of 80 mm.
One of the best times to visit Boise
June is one of the best times to visit Boise. Expect days averaging 26.5°C and nights around 11.6°C (mean 19.1°C) — warmer than Boise's yearly average — with low rainfall (24 mm), so conditions are generally comfortable for sightseeing and outdoor plans.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 28.1°C | 20.6°C | 13.0°C | 36.5°C | 5.9°C | 8 mm | 40% | 2.3 m/s | 8 |
| 2024 | 28.4°C | 20.7°C | 13.1°C | 36.6°C | 5.9°C | 21 mm | 43% | 2.1 m/s | 7.8 |
| 2023 | 24.2°C | 18.2°C | 12.1°C | 33.2°C | 4.8°C | 46 mm | 56% | 1.7 m/s | 7 |
| 2022 | 26.0°C | 18.8°C | 11.5°C | 37.5°C | 4.1°C | 38 mm | 49% | 2 m/s | 7.2 |
| 2021 | 32.0°C | 23.5°C | 15.0°C | 39.6°C | 5.9°C | 20 mm | 36% | 2.4 m/s | 8.4 |
| 2020 🌧️ | 24.3°C | 17.6°C | 10.9°C | 36.8°C | 4.1°C | 80 mm | 54% | 2.4 m/s | 6.7 |
| 2019 | 25.6°C | 18.6°C | 11.6°C | 31.6°C | 3.2°C | 6 mm | 46% | 2.2 m/s | 7.9 |
| 2018 | 26.3°C | 18.9°C | 11.5°C | 33.4°C | 5.3°C | 17 mm | 46% | 2.3 m/s | 7.7 |
| 2017 | 26.5°C | 19.2°C | 12.0°C | 36.0°C | 5.1°C | 35 mm | 51% | 2.2 m/s | 7.3 |
| 2016 | 29.4°C | 21.4°C | 13.5°C | 38.4°C | 6.7°C | 6 mm | 38% | 2 m/s | 7.9 |
| 2015 🔥 | 31.3°C | 23.6°C | 16.0°C | 42.2°C | 9.5°C | 10 mm | 39% | 2.1 m/s | 7.8 |
| 2014 | 26.1°C | 18.6°C | 11.1°C | 33.1°C | 4.5°C | 8 mm | 42% | 2.6 m/s | 7.7 |
| 2013 | 28.3°C | 20.3°C | 12.4°C | 39.7°C | 6.1°C | 14 mm | 39% | 2.1 m/s | 7.7 |
| 2012 | 26.4°C | 18.4°C | 10.4°C | 35.1°C | 3.4°C | 9 mm | 41% | 2.4 m/s | 7.8 |
| 2011 | 23.1°C | 16.2°C | 9.2°C | 33.7°C | 2.0°C | 26 mm | 52% | 2.3 m/s | 7.3 |
| 2010 | 24.0°C | 17.3°C | 10.6°C | 36.1°C | 3.8°C | 40 mm | 53% | 2.2 m/s | 6.9 |
| 2009 | 24.6°C | 18.2°C | 11.8°C | 34.7°C | 5.8°C | 63 mm | 53% | 1.9 m/s | 6.7 |
| 2008 | 25.8°C | 18.2°C | 10.5°C | 38.6°C | 3.6°C | 18 mm | 42% | 2.4 m/s | 7.8 |
| 2007 | 27.8°C | 20.0°C | 12.2°C | 35.5°C | 6.0°C | 21 mm | 37% | 2.4 m/s | 7.7 |
| 2006 | 28.0°C | 20.7°C | 13.3°C | 36.3°C | 8.7°C | 23 mm | 47% | 2.1 m/s | 7.3 |
| 2005 | 24.0°C | 17.0°C | 10.0°C | 36.9°C | 3.1°C | 34 mm | 47% | 2.2 m/s | 7.3 |
| 2004 | 27.4°C | 19.8°C | 12.1°C | 35.6°C | 6.1°C | 16 mm | 43% | 2.2 m/s | 7.8 |
| 2003 | 28.1°C | 20.1°C | 12.1°C | 36.8°C | 6.0°C | 7 mm | 39% | 2.4 m/s | 8.4 |
| 2002 | 27.9°C | 20.3°C | 12.6°C | 39.4°C | 2.7°C | 11 mm | 39% | 2.4 m/s | 7.5 |
| 2001 | 27.1°C | 19.2°C | 11.2°C | 35.8°C | 3.6°C | 11 mm | 37% | 2.5 m/s | 7.6 |
| 2000 | 28.0°C | 20.0°C | 12.0°C | 36.6°C | 4.8°C | 8 mm | 38% | 2.5 m/s | 7.8 |
| 1999 | 25.3°C | 18.3°C | 11.4°C | 35.5°C | 3.5°C | 19 mm | 45% | 2.4 m/s | 7.4 |
| 1998 | 22.9°C | 16.1°C | 9.4°C | 32.3°C | 5.1°C | 42 mm | 55% | 2.2 m/s | 7.4 |
| 1997 | 25.2°C | 18.2°C | 11.2°C | 33.1°C | 6.7°C | 37 mm | 51% | 2.3 m/s | 7.2 |
| 1996 | 26.6°C | 18.7°C | 10.9°C | 33.0°C | 4.6°C | 9 mm | 47% | 2.2 m/s | 7.7 |
| 1995 | 23.2°C | 16.6°C | 9.9°C | 31.5°C | 2.4°C | 41 mm | 55% | 2.1 m/s | 6.6 |
| 1994 | 27.8°C | 19.7°C | 11.6°C | 36.9°C | 4.6°C | 3 mm | 35% | 2.3 m/s | 7.6 |
| 1993 ❄️ | 22.5°C | 15.6°C | 8.6°C | 34.9°C | 2.8°C | 54 mm | 54% | 2.3 m/s | 6.5 |
| 1992 | 27.6°C | 20.5°C | 13.3°C | 36.3°C | 5.1°C | 52 mm | 44% | 2.1 m/s | 6.8 |
| 1991 | 23.5°C | 16.2°C | 8.8°C | 31.7°C | 4.0°C | 20 mm | 48% | 2.3 m/s | 7 |
| 1990 | 26.2°C | 18.5°C | 10.9°C | 37.7°C | 2.5°C | 10 mm | 45% | 2.3 m/s | 7.5 |
| 1989 | 27.3°C | 19.7°C | 12.1°C | 34.1°C | 7.3°C | 7 mm | 41% | 2.1 m/s | 7.7 |
| 1988 | 29.3°C | 21.3°C | 13.3°C | 38.7°C | 6.7°C | 16 mm | 40% | 2.3 m/s | 7 |
| 1987 | 29.1°C | 21.1°C | 13.0°C | 36.9°C | 4.0°C | 23 mm | 39% | 2.1 m/s | 7.2 |
| 1986 | 29.7°C | 22.0°C | 14.4°C | 35.9°C | 7.5°C | 14 mm | 43% | 2.1 m/s | 7.8 |
| 1985 | 28.0°C | 20.0°C | 12.0°C | 34.5°C | 5.3°C | 9 mm | 36% | 2.5 m/s | 7.6 |
| 1984 | 23.4°C | 16.1°C | 8.7°C | 37.0°C | 2.1°C | 50 mm | 53% | 2.2 m/s | 6.9 |
| 1983 | 24.3°C | 17.0°C | 9.7°C | 32.3°C | 4.4°C | 19 mm | 52% | 2.4 m/s | — |
| 1982 | 25.3°C | 18.5°C | 11.7°C | 33.5°C | 2.7°C | 30 mm | 52% | 1.9 m/s | — |
| 1981 | 24.6°C | 17.3°C | 9.9°C | 36.5°C | 1.9°C | 24 mm | 48% | 2.3 m/s | — |
Actual recorded June data for each year, 1981–2025 — sourced from NASA POWER.
The average high in June is around 26.5°C with lows near 11.6°C (mean 19.1°C), based on 45 years of NASA POWER data.
June averages 24 mm of rainfall in Boise, one of the drier months. The wettest on record was 80 mm in 2020.
The hottest June reached 42.2°C in 2015. The coldest dipped to 1.9°C in 1981.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average June temperatures have risen by about 2.6°C. Daytime highs moved from 25.1°C to 27.7°C and overnight lows from 10.4°C to 12.9°C over the same span.
June is one of the warmer months of the year in Boise and one of the drier months, so plan for around 26.5°C daytime highs and 11.6°C at night.
Not quite — June is the 10th coolest month in Boise, averaging 19.1°C.
For June in Boise, pack light layers you can adjust through the day, with typical highs of 26.5°C and lows of 11.6°C.
Relative humidity in June averages 45% — relatively dry.
Average wind speed in June is 2.2 m/s. The windiest June on record averaged 2.6 m/s (2014).
The wettest June on record was 2020 with 80 mm. On average, June sees 24 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 June, 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 June specifically, along with year-by-year records and how the month has changed over the decades.
