June is one of the warmer months of the year in Belfast, with average highs near 15°C and lows around 10.3°C (mean 12.7°C). It is one of the drier months, averaging 75 mm of rainfall and 85% relative humidity across the period.
June is one of the warmer months of the year in Belfast. Across 45 years of records, the warmest June in Belfast was 2023 — when the month averaged 15.2°C — while the coldest were 1987 and 1991 at 11.1°C. Typical June days reach 15°C with nights near 10.3°C. The long-term trend is warming, about 0.3°C per decade.
June is one of the drier months in Belfast, averaging 75 mm of rainfall. The wettest June on record was 2012 with 172 mm, while the driest was 2018 at 35 mm.
Relative humidity in Belfast during June averages 85%. The most humid June was 2005 at 88%, and the least humid was 2018 at 80%.
June receives about 5 kWh/m²/day of solar energy in Belfast. The sunniest June was 2018 at 6.1 kWh/m²/day, and the cloudiest was 2012 at 4.2.
Average wind speed in Belfast during June is 3.8 m/s. The windiest June was 2002 at 4.8 m/s, while the calmest were 2016, 2018 and 2023 at 2.9 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 12.2°C | 12.2°C | 12.9°C | 12.9°C | 13.4°C | +1.2°C |
| Avg High | 14.6°C | 14.6°C | 15.2°C | 15.3°C | 15.8°C | +1.2°C |
| Avg Low | 9.8°C | 9.9°C | 10.6°C | 10.5°C | 11.0°C | +1.2°C |
| Avg Rain | 69 mm | 72 mm | 81 mm | 81 mm | 69 mm | +1 mm |
June temperatures in Belfast have risen by about 1.4°C between 1981–1985 and 2021–2025.
June has ranged from a record low of 5.5°C (1985) to a record high of 23.1°C (2018).
Rainfall in June is one of the drier months, averaging 75 mm, with a wettest year of 172 mm.
One of the best times to visit Belfast
June is one of the best times to visit Belfast. Expect days averaging 15°C and nights around 10.3°C (mean 12.7°C) — warmer than Belfast's yearly average — with moderate rainfall (75 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 | 16.0°C | 13.6°C | 11.1°C | 19.7°C | 7.1°C | 99 mm | 86% | 4.2 m/s | 4.8 |
| 2024 | 14.7°C | 12.3°C | 9.9°C | 18.9°C | 7.4°C | 45 mm | 84% | 4.3 m/s | 5 |
| 2023 🔥 | 17.7°C | 15.2°C | 12.6°C | 22.0°C | 9.7°C | 61 mm | 84% | 2.9 m/s | 5.8 |
| 2022 | 15.5°C | 13.2°C | 10.8°C | 18.4°C | 7.8°C | 66 mm | 85% | 4 m/s | 5.2 |
| 2021 | 15.7°C | 13.2°C | 10.7°C | 18.5°C | 8.4°C | 38 mm | 85% | 3.7 m/s | 5.3 |
| 2020 | 15.4°C | 13.2°C | 10.9°C | 19.4°C | 7.2°C | 108 mm | 86% | 4.3 m/s | 4.7 |
| 2019 | 14.8°C | 12.4°C | 10.1°C | 18.8°C | 7.1°C | 87 mm | 86% | 3.7 m/s | 5.2 |
| 2018 | 17.3°C | 14.4°C | 11.4°C | 23.1°C | 7.8°C | 35 mm | 80% | 2.9 m/s | 6.1 |
| 2017 | 15.5°C | 13.3°C | 11.1°C | 19.4°C | 8.6°C | 120 mm | 86% | 4.5 m/s | 4.8 |
| 2016 | 15.9°C | 13.6°C | 11.3°C | 19.0°C | 8.4°C | 82 mm | 86% | 2.9 m/s | 5 |
| 2015 | 14.4°C | 11.9°C | 9.4°C | 18.2°C | 5.6°C | 49 mm | 84% | 4.1 m/s | 5.3 |
| 2014 | 15.6°C | 13.4°C | 11.2°C | 19.3°C | 9.1°C | 65 mm | 86% | 3.3 m/s | 5.6 |
| 2013 | 15.1°C | 12.5°C | 10.0°C | 17.8°C | 6.3°C | 68 mm | 84% | 3.2 m/s | 5.2 |
| 2012 🌧️ | 14.2°C | 12.1°C | 10.1°C | 18.8°C | 7.1°C | 172 mm | 86% | 3.9 m/s | 4.2 |
| 2011 | 14.1°C | 11.8°C | 9.4°C | 19.9°C | 6.7°C | 89 mm | 85% | 3.6 m/s | 5 |
| 2010 | 15.8°C | 13.4°C | 11.0°C | 18.2°C | 8.7°C | 46 mm | 85% | 3.1 m/s | 5.8 |
| 2009 | 15.6°C | 13.1°C | 10.7°C | 20.2°C | 7.2°C | 47 mm | 83% | 3.3 m/s | 5.9 |
| 2008 | 14.8°C | 12.4°C | 10.0°C | 18.7°C | 8.1°C | 77 mm | 84% | 4.1 m/s | 5.1 |
| 2007 | 15.5°C | 13.3°C | 11.1°C | 20.7°C | 8.6°C | 152 mm | 87% | 3.8 m/s | 4.7 |
| 2006 | 16.1°C | 13.7°C | 11.2°C | 20.5°C | 8.8°C | 43 mm | 85% | 3.2 m/s | 5.3 |
| 2005 | 15.6°C | 13.4°C | 11.1°C | 19.6°C | 8.7°C | 73 mm | 88% | 3.5 m/s | 4.8 |
| 2004 | 15.6°C | 13.3°C | 11.0°C | 18.8°C | 8.6°C | 77 mm | 86% | 4.3 m/s | 4.9 |
| 2003 | 15.4°C | 13.2°C | 10.9°C | 17.3°C | 9.2°C | 83 mm | 86% | 4.1 m/s | 5.1 |
| 2002 | 14.4°C | 12.3°C | 10.2°C | 17.6°C | 7.2°C | 108 mm | 87% | 4.8 m/s | 4.6 |
| 2001 | 14.1°C | 11.9°C | 9.7°C | 17.9°C | 5.9°C | 74 mm | 85% | 3.9 m/s | 4.8 |
| 2000 | 14.7°C | 12.6°C | 10.5°C | 18.4°C | 7.6°C | 76 mm | 85% | 3.9 m/s | 4.6 |
| 1999 | 14.3°C | 12.0°C | 9.7°C | 17.6°C | 6.8°C | 80 mm | 85% | 3.7 m/s | 5.2 |
| 1998 | 14.5°C | 12.3°C | 10.0°C | 18.5°C | 6.0°C | 112 mm | 86% | 4.3 m/s | 4.5 |
| 1997 | 14.1°C | 12.0°C | 9.8°C | 15.6°C | 7.7°C | 101 mm | 85% | 4.6 m/s | 4.7 |
| 1996 | 14.5°C | 12.0°C | 9.5°C | 18.2°C | 6.6°C | 41 mm | 84% | 4 m/s | 5.4 |
| 1995 | 15.4°C | 12.8°C | 10.2°C | 22.6°C | 7.2°C | 40 mm | 83% | 3.9 m/s | 5.8 |
| 1994 | 14.0°C | 11.7°C | 9.4°C | 18.5°C | 6.3°C | 46 mm | 86% | 4.4 m/s | 4.5 |
| 1993 | 14.7°C | 12.5°C | 10.3°C | 17.6°C | 7.8°C | 77 mm | 87% | 3.3 m/s | 4.7 |
| 1992 | 16.3°C | 13.7°C | 11.1°C | 19.5°C | 9.4°C | 36 mm | 84% | 3.4 m/s | 5.1 |
| 1991 | 13.3°C | 11.1°C | 8.9°C | 16.0°C | 5.6°C | 77 mm | 84% | 4.2 m/s | 4.8 |
| 1990 | 14.4°C | 12.1°C | 9.9°C | 16.9°C | 8.0°C | 110 mm | 85% | 4.1 m/s | 4.7 |
| 1989 | 15.0°C | 12.5°C | 10.0°C | 21.3°C | 5.8°C | 77 mm | 82% | 3.7 m/s | 5.2 |
| 1988 | 15.9°C | 13.3°C | 10.6°C | 18.2°C | 7.2°C | 42 mm | 84% | 3 m/s | 5.4 |
| 1987 ❄️ | 13.2°C | 11.1°C | 8.9°C | 16.7°C | 6.0°C | 80 mm | 84% | 3.3 m/s | 4.5 |
| 1986 | 14.8°C | 12.3°C | 9.8°C | 20.6°C | 6.4°C | 59 mm | 85% | 4.1 m/s | 4.7 |
| 1985 | 13.7°C | 11.2°C | 8.6°C | 17.1°C | 5.5°C | 60 mm | 83% | 3.7 m/s | 5 |
| 1984 | 15.3°C | 12.7°C | 10.1°C | 19.9°C | 6.7°C | 57 mm | 83% | 3.7 m/s | 4.9 |
| 1983 | 14.4°C | 12.0°C | 9.6°C | 17.9°C | 7.2°C | 63 mm | 85% | 3.8 m/s | — |
| 1982 | 15.1°C | 12.9°C | 10.7°C | 20.5°C | 7.5°C | 90 mm | 86% | 3.6 m/s | — |
| 1981 | 14.0°C | 11.9°C | 9.9°C | 18.3°C | 7.5°C | 91 mm | 85% | 4.7 m/s | — |
Actual recorded June data for each year, 1981–2025 — sourced from NASA POWER.
The average high in June is around 15°C with lows near 10.3°C (mean 12.7°C), based on 45 years of NASA POWER data.
June averages 75 mm of rainfall in Belfast, one of the drier months. The wettest on record was 172 mm in 2012.
The hottest June reached 23.1°C in 2018. The coldest dipped to 5.5°C in 1985.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average June temperatures have risen by about 1.4°C. Daytime highs moved from 14.5°C to 15.9°C and overnight lows from 9.8°C to 11°C over the same span.
June is one of the warmer months of the year in Belfast and one of the drier months, so plan for around 15°C daytime highs and 10.3°C at night.
Not quite — June is the 9th coolest month in Belfast, averaging 12.7°C.
For June in Belfast, pack light layers you can adjust through the day, with typical highs of 15°C and lows of 10.3°C. Bring an umbrella or light rain jacket too.
Relative humidity in June averages 85% — quite humid.
Average wind speed in June is 3.8 m/s. The windiest June on record averaged 4.8 m/s (2002).
The wettest June on record was 2012 with 172 mm. On average, June sees 75 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 Belfast 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.
