June is one of the warmer months of the year in Boston, with average highs near 18.4°C and lows around 10.2°C (mean 14.3°C). It is about average for rainfall, averaging 63 mm of rainfall and 80% relative humidity across the period.
June is one of the warmer months of the year in Boston. Across 45 years of records, the warmest June in Boston was 2025 — when the month averaged 17°C — while the coldest were 1985 and 1991 at 12.2°C. Typical June days reach 18.4°C with nights near 10.2°C. The long-term trend is warming, about 0.4°C per decade.
June is about average for rainfall in Boston, averaging 63 mm of rainfall. The wettest June on record was 2019 with 159 mm, while the driest was 2018 at 17 mm.
Relative humidity in Boston during June averages 80%. The most humid June was 2007 at 84%, and the least humid was 1992 at 74%.
June receives about 5.1 kWh/m²/day of solar energy in Boston. The sunniest Junes were 2018 and 2025 at 6 kWh/m²/day, and the cloudiest was 2012 at 4.1.
Average wind speed in Boston during June is 3.2 m/s. The windiest Junes were 1981 and 2012 at 4.1 m/s, while the calmest was 2014 at 2.4 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 13.4°C | 13.9°C | 14.7°C | 14.4°C | 15.4°C | +2°C |
| Avg High | 17.4°C | 18.0°C | 18.8°C | 18.5°C | 19.8°C | +2.4°C |
| Avg Low | 9.4°C | 9.8°C | 10.5°C | 10.4°C | 11.1°C | +1.7°C |
| Avg Rain | 60 mm | 60 mm | 68 mm | 70 mm | 51 mm | -9 mm |
June temperatures in Boston have risen by about 2.1°C between 1981–1985 and 2021–2025.
June has ranged from a record low of 4°C (1991) to a record high of 28.1°C (1992).
Rainfall in June is about average for rainfall, averaging 63 mm, with a wettest year of 159 mm.
One of the best times to visit Boston
June is one of the best times to visit Boston. Expect days averaging 18.4°C and nights around 10.2°C (mean 14.3°C) — warmer than Boston's yearly average — with moderate rainfall (63 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 🔥 | 21.7°C | 17.0°C | 12.3°C | 27.7°C | 8.1°C | 23 mm | 78% | 3.5 m/s | 6 |
| 2024 | 18.6°C | 14.3°C | 9.9°C | 25.3°C | 5.8°C | 39 mm | 79% | 2.9 m/s | 5.5 |
| 2023 | 20.5°C | 16.1°C | 11.7°C | 27.1°C | 6.8°C | 47 mm | 80% | 3.1 m/s | 5.9 |
| 2022 | 19.6°C | 15.2°C | 10.8°C | 26.1°C | 6.9°C | 54 mm | 77% | 3 m/s | 5.3 |
| 2021 | 19.5°C | 15.3°C | 11.2°C | 23.9°C | 6.9°C | 66 mm | 82% | 2.7 m/s | 5.2 |
| 2020 | 18.7°C | 14.7°C | 10.7°C | 25.8°C | 6.5°C | 76 mm | 82% | 3.5 m/s | 5 |
| 2019 🌧️ | 18.6°C | 14.5°C | 10.5°C | 26.7°C | 7.9°C | 159 mm | 82% | 3.4 m/s | 4.6 |
| 2018 | 19.5°C | 15.1°C | 10.6°C | 23.3°C | 7.2°C | 17 mm | 80% | 2.7 m/s | 6 |
| 2017 | 20.0°C | 16.1°C | 12.2°C | 27.5°C | 8.2°C | 85 mm | 80% | 3.8 m/s | 5.1 |
| 2016 | 18.2°C | 14.6°C | 10.9°C | 23.5°C | 7.6°C | 103 mm | 84% | 2.5 m/s | 4.4 |
| 2015 | 18.1°C | 13.7°C | 9.2°C | 24.4°C | 4.7°C | 35 mm | 78% | 3.4 m/s | 5.7 |
| 2014 | 18.7°C | 14.6°C | 10.6°C | 22.1°C | 8.4°C | 39 mm | 80% | 2.4 m/s | 5.1 |
| 2013 | 17.3°C | 13.4°C | 9.6°C | 22.3°C | 5.8°C | 41 mm | 80% | 3.4 m/s | 5.1 |
| 2012 | 17.2°C | 13.7°C | 10.1°C | 24.7°C | 6.1°C | 117 mm | 80% | 4.1 m/s | 4.1 |
| 2011 | 18.5°C | 14.2°C | 9.9°C | 26.9°C | 6.4°C | 63 mm | 78% | 3.3 m/s | 5.3 |
| 2010 | 19.1°C | 14.5°C | 10.0°C | 24.8°C | 6.3°C | 40 mm | 80% | 2.5 m/s | 5.8 |
| 2009 | 18.5°C | 14.4°C | 10.3°C | 24.5°C | 5.0°C | 50 mm | 80% | 2.8 m/s | 5.4 |
| 2008 | 18.2°C | 14.3°C | 10.4°C | 22.5°C | 6.7°C | 86 mm | 80% | 3.2 m/s | 5.3 |
| 2007 | 18.5°C | 14.6°C | 10.7°C | 21.1°C | 6.8°C | 145 mm | 84% | 3 m/s | 4.7 |
| 2006 | 20.0°C | 15.3°C | 10.7°C | 26.0°C | 5.8°C | 24 mm | 79% | 2.6 m/s | 5.7 |
| 2005 | 19.3°C | 14.9°C | 10.5°C | 26.4°C | 5.5°C | 59 mm | 81% | 2.9 m/s | 5.1 |
| 2004 | 18.8°C | 15.0°C | 11.2°C | 25.4°C | 7.5°C | 58 mm | 82% | 3.3 m/s | 5.3 |
| 2003 | 20.0°C | 15.8°C | 11.6°C | 23.6°C | 8.8°C | 129 mm | 82% | 2.9 m/s | 5.2 |
| 2002 | 18.5°C | 14.4°C | 10.3°C | 23.9°C | 7.6°C | 43 mm | 81% | 3.4 m/s | 4.8 |
| 2001 | 17.5°C | 13.3°C | 9.1°C | 24.2°C | 4.7°C | 44 mm | 81% | 3.3 m/s | 4.9 |
| 2000 | 18.6°C | 14.5°C | 10.4°C | 27.2°C | 7.3°C | 41 mm | 82% | 3.2 m/s | 4.5 |
| 1999 | 17.7°C | 13.6°C | 9.4°C | 22.7°C | 6.4°C | 66 mm | 80% | 2.8 m/s | 5.3 |
| 1998 | 17.9°C | 14.1°C | 10.4°C | 23.3°C | 6.0°C | 116 mm | 83% | 3.6 m/s | 4.3 |
| 1997 | 17.2°C | 13.7°C | 10.2°C | 22.2°C | 7.1°C | 143 mm | 82% | 3.6 m/s | 4.4 |
| 1996 | 18.7°C | 13.9°C | 9.2°C | 25.7°C | 5.4°C | 25 mm | 78% | 2.8 m/s | 5.7 |
| 1995 | 16.9°C | 13.0°C | 9.0°C | 26.1°C | 6.7°C | 31 mm | 81% | 3.4 m/s | 5 |
| 1994 | 18.4°C | 14.1°C | 9.7°C | 24.2°C | 5.8°C | 20 mm | 79% | 3.5 m/s | 5.8 |
| 1993 | 18.9°C | 14.5°C | 10.0°C | 23.9°C | 7.4°C | 45 mm | 80% | 2.7 m/s | 5.3 |
| 1992 | 20.6°C | 16.0°C | 11.4°C | 28.1°C | 9.0°C | 35 mm | 74% | 2.8 m/s | 5.2 |
| 1991 | 16.0°C | 12.2°C | 8.5°C | 21.0°C | 4.0°C | 72 mm | 79% | 3.7 m/s | 4.4 |
| 1990 | 17.7°C | 13.8°C | 9.9°C | 23.5°C | 6.4°C | 44 mm | 79% | 3.4 m/s | 4.5 |
| 1989 | 18.3°C | 13.9°C | 9.5°C | 24.9°C | 4.3°C | 56 mm | 79% | 2.9 m/s | 5.3 |
| 1988 | 17.2°C | 13.5°C | 9.8°C | 21.9°C | 6.1°C | 44 mm | 83% | 2.9 m/s | 5.3 |
| 1987 | 16.2°C | 12.4°C | 8.7°C | 24.4°C | 4.8°C | 88 mm | 83% | 2.9 m/s | 4.2 |
| 1986 | 18.3°C | 13.8°C | 9.3°C | 25.1°C | 5.6°C | 34 mm | 81% | 3.6 m/s | 5.2 |
| 1985 ❄️ | 15.9°C | 12.2°C | 8.4°C | 20.3°C | 4.4°C | 95 mm | 82% | 3.3 m/s | 4.8 |
| 1984 | 18.2°C | 13.9°C | 9.5°C | 24.7°C | 5.8°C | 45 mm | 80% | 3.1 m/s | 5.2 |
| 1983 | 17.3°C | 13.2°C | 9.1°C | 21.8°C | 6.3°C | 27 mm | 81% | 3.2 m/s | — |
| 1982 | 18.5°C | 14.9°C | 11.2°C | 25.0°C | 7.1°C | 114 mm | 83% | 2.7 m/s | — |
| 1981 | 17.0°C | 13.2°C | 9.4°C | 22.4°C | 7.0°C | 37 mm | 81% | 4.1 m/s | — |
Actual recorded June data for each year, 1981–2025 — sourced from NASA POWER.
The average high in June is around 18.4°C with lows near 10.2°C (mean 14.3°C), based on 45 years of NASA POWER data.
June averages 63 mm of rainfall in Boston, about average for rainfall. The wettest on record was 159 mm in 2019.
The hottest June reached 28.1°C in 1992. The coldest dipped to 4°C in 1991.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average June temperatures have risen by about 2.1°C. Daytime highs moved from 17.4°C to 20°C and overnight lows from 9.5°C to 11.2°C over the same span.
June is one of the warmer months of the year in Boston and about average for rainfall, so plan for around 18.4°C daytime highs and 10.2°C at night.
Not quite — June is the 9th coolest month in Boston, averaging 14.3°C.
For June in Boston, pack light layers you can adjust through the day, with typical highs of 18.4°C and lows of 10.2°C. Bring an umbrella or light rain jacket too.
Relative humidity in June averages 80% — quite humid.
Average wind speed in June is 3.2 m/s. The windiest June on record averaged 4.1 m/s (1981).
The wettest June on record was 2019 with 159 mm. On average, June sees 63 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 Boston 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.
