June is one of the warmer months of the year in Cardiff, with average highs near 18°C and lows around 10.6°C (mean 14.3°C). It is one of the drier months, averaging 66 mm of rainfall and 82% relative humidity across the period.
June is one of the warmer months of the year in Cardiff. Across 45 years of records, the warmest June in Cardiff was 2023 — when the month averaged 16.7°C — while the coldest was 1991 at 12.1°C. Typical June days reach 18°C with nights near 10.6°C. The long-term trend is warming, about 0.4°C per decade.
June is one of the drier months in Cardiff, averaging 66 mm of rainfall. The wettest June on record was 2012 with 158 mm, while the driest was 2018 at 18 mm.
Relative humidity in Cardiff during June averages 82%. The most humid June was 2016 at 86%, and the least humid was 1992 at 77%.
June receives about 5.3 kWh/m²/day of solar energy in Cardiff. The sunniest Junes were 2010 and 2018 at 6.2 kWh/m²/day, and the cloudiest were 1997 and 2012 at 4.2.
Average wind speed in Cardiff during June is 3.3 m/s. The windiest June was 2012 at 4.3 m/s, while the calmest was 2014 at 2.5 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 13.8°C | 13.8°C | 14.5°C | 14.5°C | 15.2°C | +1.4°C |
| Avg High | 17.5°C | 17.6°C | 18.2°C | 18.1°C | 19.1°C | +1.6°C |
| Avg Low | 10.1°C | 10.0°C | 10.9°C | 10.9°C | 11.3°C | +1.2°C |
| Avg Rain | 62 mm | 67 mm | 60 mm | 75 mm | 66 mm | +4 mm |
June temperatures in Cardiff have risen by about 1.6°C between 1981–1985 and 2021–2025.
June has ranged from a record low of 4.1°C (1989) to a record high of 27.1°C (2020).
Rainfall in June is one of the drier months, averaging 66 mm, with a wettest year of 158 mm.
One of the best times to visit Cardiff
June is one of the best times to visit Cardiff. Expect days averaging 18°C and nights around 10.6°C (mean 14.3°C) — warmer than Cardiff's yearly average — with moderate rainfall (66 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 | 19.8°C | 16.2°C | 12.5°C | 25.9°C | 8.7°C | 79 mm | 83% | 3.7 m/s | 5.7 |
| 2024 | 17.8°C | 14.0°C | 10.2°C | 24.1°C | 6.9°C | 28 mm | 81% | 3.2 m/s | 5.8 |
| 2023 🔥 | 21.1°C | 16.7°C | 12.4°C | 24.3°C | 6.9°C | 42 mm | 81% | 3.1 m/s | 6 |
| 2022 | 18.6°C | 14.7°C | 10.8°C | 23.7°C | 8.1°C | 77 mm | 80% | 3.3 m/s | 5.7 |
| 2021 | 18.9°C | 15.0°C | 11.1°C | 23.6°C | 7.8°C | 43 mm | 83% | 2.8 m/s | 5.3 |
| 2020 | 18.3°C | 14.6°C | 10.9°C | 27.1°C | 6.8°C | 126 mm | 81% | 3.6 m/s | 5.2 |
| 2019 | 17.4°C | 13.9°C | 10.4°C | 24.8°C | 7.3°C | 110 mm | 84% | 3.6 m/s | 4.7 |
| 2018 | 20.2°C | 16.0°C | 11.8°C | 24.8°C | 8.4°C | 18 mm | 80% | 3 m/s | 6.2 |
| 2017 | 19.1°C | 15.6°C | 12.1°C | 27.0°C | 9.3°C | 68 mm | 83% | 3.9 m/s | 5.1 |
| 2016 | 18.3°C | 15.0°C | 11.7°C | 22.2°C | 6.8°C | 110 mm | 86% | 3.1 m/s | 4.6 |
| 2015 | 17.7°C | 13.8°C | 9.9°C | 24.5°C | 5.3°C | 44 mm | 80% | 3.7 m/s | 5.9 |
| 2014 | 18.8°C | 15.0°C | 11.2°C | 21.9°C | 8.4°C | 57 mm | 81% | 2.5 m/s | 5.8 |
| 2013 | 17.3°C | 13.6°C | 9.9°C | 21.9°C | 6.7°C | 39 mm | 82% | 3.9 m/s | 5.2 |
| 2012 🌧️ | 16.6°C | 13.7°C | 10.8°C | 20.8°C | 7.3°C | 158 mm | 85% | 4.3 m/s | 4.2 |
| 2011 | 16.9°C | 13.4°C | 10.0°C | 23.3°C | 6.2°C | 100 mm | 82% | 3.9 m/s | 5.3 |
| 2010 | 19.1°C | 14.9°C | 10.8°C | 22.9°C | 6.9°C | 41 mm | 80% | 2.7 m/s | 6.2 |
| 2009 | 18.6°C | 14.8°C | 11.0°C | 24.5°C | 7.3°C | 76 mm | 80% | 2.6 m/s | 5.6 |
| 2008 | 17.4°C | 13.9°C | 10.4°C | 21.7°C | 7.2°C | 50 mm | 81% | 3.6 m/s | 5.4 |
| 2007 | 18.3°C | 14.9°C | 11.5°C | 22.4°C | 8.8°C | 116 mm | 85% | 3.1 m/s | 4.7 |
| 2006 | 19.6°C | 15.4°C | 11.3°C | 23.5°C | 5.9°C | 39 mm | 80% | 2.6 m/s | 6 |
| 2005 | 18.7°C | 15.0°C | 11.3°C | 23.0°C | 6.5°C | 73 mm | 83% | 3.2 m/s | 5.3 |
| 2004 | 18.3°C | 14.8°C | 11.4°C | 22.3°C | 7.6°C | 55 mm | 82% | 3.6 m/s | 5.5 |
| 2003 | 19.0°C | 15.1°C | 11.1°C | 22.6°C | 8.3°C | 68 mm | 82% | 3.1 m/s | 5.4 |
| 2002 | 16.4°C | 13.2°C | 9.9°C | 19.6°C | 6.9°C | 56 mm | 84% | 3.7 m/s | 4.9 |
| 2001 | 17.4°C | 13.7°C | 10.0°C | 24.5°C | 6.0°C | 29 mm | 81% | 3.1 m/s | 5.3 |
| 2000 | 17.9°C | 14.3°C | 10.8°C | 23.0°C | 7.2°C | 44 mm | 84% | 3.3 m/s | 4.7 |
| 1999 | 16.9°C | 13.3°C | 9.6°C | 21.7°C | 5.6°C | 74 mm | 82% | 3.1 m/s | 5.4 |
| 1998 | 17.0°C | 13.8°C | 10.6°C | 23.1°C | 7.3°C | 123 mm | 85% | 4.2 m/s | 4.4 |
| 1997 | 17.2°C | 13.7°C | 10.2°C | 21.1°C | 8.0°C | 113 mm | 82% | 4.1 m/s | 4.2 |
| 1996 | 18.1°C | 13.7°C | 9.4°C | 23.5°C | 5.8°C | 29 mm | 81% | 2.8 m/s | 5.9 |
| 1995 | 18.0°C | 13.7°C | 9.4°C | 26.9°C | 5.6°C | 19 mm | 80% | 3.5 m/s | 5.6 |
| 1994 | 17.5°C | 13.7°C | 9.8°C | 22.6°C | 6.2°C | 36 mm | 83% | 3.8 m/s | 5.8 |
| 1993 | 18.8°C | 14.8°C | 10.7°C | 22.7°C | 7.2°C | 76 mm | 82% | 2.8 m/s | 5.6 |
| 1992 | 19.9°C | 15.4°C | 10.8°C | 24.2°C | 7.8°C | 36 mm | 77% | 2.7 m/s | 5.7 |
| 1991 ❄️ | 15.4°C | 12.1°C | 8.8°C | 18.3°C | 4.2°C | 103 mm | 82% | 4.1 m/s | 4.5 |
| 1990 | 16.7°C | 13.4°C | 10.2°C | 21.4°C | 7.9°C | 62 mm | 82% | 3.7 m/s | 4.5 |
| 1989 | 18.4°C | 14.3°C | 10.2°C | 25.4°C | 4.1°C | 46 mm | 78% | 3.1 m/s | 5.4 |
| 1988 | 18.2°C | 14.5°C | 10.7°C | 22.3°C | 7.1°C | 40 mm | 82% | 3 m/s | 5.5 |
| 1987 | 15.9°C | 12.6°C | 9.2°C | 21.5°C | 5.4°C | 76 mm | 83% | 3.4 m/s | 4.7 |
| 1986 | 18.5°C | 14.2°C | 10.0°C | 25.7°C | 5.1°C | 58 mm | 82% | 3.5 m/s | 5.2 |
| 1985 | 16.0°C | 12.6°C | 9.1°C | 20.8°C | 4.4°C | 106 mm | 82% | 3.8 m/s | 5.1 |
| 1984 | 18.4°C | 14.2°C | 10.0°C | 23.5°C | 5.9°C | 32 mm | 80% | 2.9 m/s | 5.6 |
| 1983 | 17.2°C | 13.6°C | 9.9°C | 22.6°C | 6.6°C | 59 mm | 84% | 3.2 m/s | — |
| 1982 | 18.5°C | 15.0°C | 11.5°C | 23.0°C | 6.9°C | 91 mm | 82% | 2.9 m/s | — |
| 1981 | 16.3°C | 13.1°C | 9.9°C | 21.2°C | 6.3°C | 46 mm | 83% | 3.8 m/s | — |
Actual recorded June data for each year, 1981–2025 — sourced from NASA POWER.
The average high in June is around 18°C with lows near 10.6°C (mean 14.3°C), based on 45 years of NASA POWER data.
June averages 66 mm of rainfall in Cardiff, one of the drier months. The wettest on record was 158 mm in 2012.
The hottest June reached 27.1°C in 2020. The coldest dipped to 4.1°C in 1989.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average June temperatures have risen by about 1.6°C. Daytime highs moved from 17.3°C to 19.2°C and overnight lows from 10.1°C to 11.4°C over the same span.
June is one of the warmer months of the year in Cardiff and one of the drier months, so plan for around 18°C daytime highs and 10.6°C at night.
Not quite — June is the 9th coolest month in Cardiff, averaging 14.3°C.
For June in Cardiff, pack light layers you can adjust through the day, with typical highs of 18°C and lows of 10.6°C. Bring an umbrella or light rain jacket too.
Relative humidity in June averages 82% — quite humid.
Average wind speed in June is 3.3 m/s. The windiest June on record averaged 4.3 m/s (2012).
The wettest June on record was 2012 with 158 mm. On average, June sees 66 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 Cardiff 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.
