June is one of the warmer months of the year in Cornwall, with average highs near 23.3°C and lows around 12.7°C (mean 18°C). It is a relatively wet time of year, averaging 102 mm of rainfall and 78% relative humidity across the period.
June is one of the warmer months of the year in Cornwall. Across 45 years of records, the warmest June in Cornwall was 2021 — when the month averaged 21.1°C — while the coldest was 1985 at 15.1°C. Typical June days reach 23.3°C with nights near 12.7°C. The long-term trend is warming, about 0.4°C per decade.
June is a relatively wet time of year in Cornwall, averaging 102 mm of rainfall. The wettest June on record was 2002 with 194 mm, while the driest was 1991 at 26 mm.
Relative humidity in Cornwall during June averages 78%. The most humid June was 2008 at 83%, and the least humid was 2021 at 67%.
June receives about 5.8 kWh/m²/day of solar energy in Cornwall. The sunniest June was 1995 at 6.7 kWh/m²/day, and the cloudiest were 1990 and 1996 at 5.
Average wind speed in Cornwall during June is 0.4 m/s. The windiest Junes were 2016, 2021 and 2025, among others at 0.5 m/s, while the calmest were 2022, 2023 and 2024, among others at 0.4 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 16.9°C | 18.2°C | 18.1°C | 18.0°C | 19.4°C | +2.5°C |
| Avg High | 22.3°C | 23.5°C | 23.3°C | 23.2°C | 25.0°C | +2.7°C |
| Avg Low | 11.6°C | 12.8°C | 12.9°C | 12.8°C | 13.8°C | +2.2°C |
| Avg Rain | 98 mm | 97 mm | 104 mm | 122 mm | 78 mm | -20 mm |
June temperatures in Cornwall have risen by about 2.4°C between 1981–1985 and 2021–2025.
June has ranged from a record low of 0.8°C (1986) to a record high of 33.8°C (2005).
Rainfall in June is a relatively wet time of year, averaging 102 mm, with a wettest year of 194 mm.
One of the best times to visit Cornwall
June is one of the best times to visit Cornwall. Expect days averaging 23.3°C and nights around 12.7°C (mean 18°C) — warmer than Cornwall's yearly average — with higher rainfall (102 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 | 25.3°C | 19.6°C | 14.0°C | 32.9°C | 6.4°C | 68 mm | 74% | 0.5 m/s | 6 |
| 2024 | 24.5°C | 19.2°C | 14.0°C | 31.0°C | 8.1°C | 135 mm | 78% | 0.4 m/s | 5.5 |
| 2023 | 23.5°C | 18.4°C | 13.2°C | 32.6°C | 5.8°C | 69 mm | 78% | 0.4 m/s | 5.3 |
| 2022 | 24.3°C | 18.7°C | 13.2°C | 31.8°C | 7.1°C | 74 mm | 74% | 0.4 m/s | 5.5 |
| 2021 🔥 | 26.9°C | 21.1°C | 15.2°C | 32.9°C | 8.6°C | 68 mm | 67% | 0.5 m/s | 5.9 |
| 2020 | 25.2°C | 19.3°C | 13.4°C | 33.1°C | 5.0°C | 53 mm | 72% | 0.4 m/s | 6.1 |
| 2019 | 22.7°C | 17.3°C | 11.9°C | 29.9°C | 4.5°C | 99 mm | 79% | 0.4 m/s | 5.9 |
| 2018 | 22.8°C | 17.5°C | 12.2°C | 29.5°C | 7.1°C | 94 mm | 79% | 0.4 m/s | 6.1 |
| 2017 | 22.4°C | 17.9°C | 13.3°C | 29.7°C | 5.9°C | 145 mm | 82% | 0.4 m/s | 5.3 |
| 2016 | 23.9°C | 18.3°C | 12.6°C | 30.2°C | 5.9°C | 76 mm | 72% | 0.5 m/s | 6.3 |
| 2015 | 22.9°C | 17.4°C | 11.9°C | 29.7°C | 5.5°C | 147 mm | 78% | 0.4 m/s | 5.7 |
| 2014 | 23.8°C | 18.6°C | 13.5°C | 29.3°C | 8.1°C | 137 mm | 80% | 0.4 m/s | 5.9 |
| 2013 | 22.0°C | 17.4°C | 12.7°C | 28.1°C | 6.5°C | 185 mm | 82% | 0.4 m/s | 5.1 |
| 2012 | 24.2°C | 19.0°C | 13.7°C | 31.6°C | 8.0°C | 86 mm | 76% | 0.4 m/s | 6.1 |
| 2011 | 23.9°C | 18.5°C | 13.0°C | 28.3°C | 5.9°C | 81 mm | 80% | 0.4 m/s | 5.7 |
| 2010 | 22.9°C | 18.1°C | 13.3°C | 27.7°C | 7.8°C | 171 mm | 80% | 0.4 m/s | 5.1 |
| 2009 | 22.4°C | 17.4°C | 12.3°C | 28.6°C | 1.7°C | 74 mm | 79% | 0.4 m/s | 5.7 |
| 2008 | 23.7°C | 19.1°C | 14.5°C | 29.3°C | 9.5°C | 119 mm | 83% | 0.4 m/s | 5.4 |
| 2007 | 24.1°C | 18.5°C | 12.8°C | 30.1°C | 4.1°C | 58 mm | 78% | 0.4 m/s | 6.2 |
| 2006 | 23.1°C | 18.2°C | 13.3°C | 32.9°C | 6.4°C | 124 mm | 81% | 0.4 m/s | 5.4 |
| 2005 | 25.9°C | 20.8°C | 15.6°C | 33.8°C | 9.7°C | 91 mm | 81% | 0.4 m/s | 5.7 |
| 2004 | 22.0°C | 16.5°C | 11.1°C | 28.5°C | 4.7°C | 98 mm | 78% | 0.4 m/s | 6.5 |
| 2003 | 23.3°C | 17.7°C | 12.1°C | 29.3°C | 5.0°C | 88 mm | 78% | 0.4 m/s | 6.3 |
| 2002 🌧️ | 22.5°C | 17.3°C | 12.2°C | 28.3°C | 4.3°C | 194 mm | 79% | 0.4 m/s | 5.4 |
| 2001 | 24.1°C | 18.7°C | 13.4°C | 30.5°C | 5.4°C | 83 mm | 79% | 0.4 m/s | 6 |
| 2000 | 21.6°C | 16.8°C | 11.9°C | 27.6°C | 5.8°C | 113 mm | 82% | 0.4 m/s | 5.1 |
| 1999 | 25.7°C | 19.9°C | 14.1°C | 31.5°C | 7.0°C | 81 mm | 75% | 0.4 m/s | 5.8 |
| 1998 | 23.6°C | 18.8°C | 14.0°C | 31.2°C | 5.1°C | 162 mm | 81% | 0.4 m/s | 5.1 |
| 1997 | 24.0°C | 18.6°C | 13.2°C | 28.5°C | 7.2°C | 74 mm | 79% | 0.4 m/s | 6.6 |
| 1996 | 23.0°C | 18.1°C | 13.2°C | 28.2°C | 6.6°C | 105 mm | 82% | 0.4 m/s | 5 |
| 1995 | 24.8°C | 18.7°C | 12.6°C | 30.1°C | 6.8°C | 80 mm | 75% | 0.4 m/s | 6.7 |
| 1994 | 24.4°C | 19.0°C | 13.6°C | 32.2°C | 6.1°C | 144 mm | 79% | 0.4 m/s | 5.6 |
| 1993 | 21.6°C | 16.5°C | 11.5°C | 27.7°C | 5.1°C | 124 mm | 81% | 0.4 m/s | 5.6 |
| 1992 | 21.4°C | 16.3°C | 11.1°C | 28.3°C | 5.3°C | 66 mm | 79% | 0.4 m/s | 6 |
| 1991 | 23.5°C | 17.9°C | 12.2°C | 28.5°C | 6.8°C | 26 mm | 77% | 0.4 m/s | 6.5 |
| 1990 | 22.5°C | 17.7°C | 12.9°C | 29.0°C | 3.9°C | 112 mm | 82% | 0.4 m/s | 5 |
| 1989 | 23.2°C | 18.1°C | 13.1°C | 29.1°C | 7.7°C | 110 mm | 81% | 0.4 m/s | 5.6 |
| 1988 | 21.7°C | 15.7°C | 9.7°C | 29.4°C | 3.6°C | 80 mm | 73% | 0.5 m/s | 6.5 |
| 1987 | 23.5°C | 18.4°C | 13.3°C | 30.8°C | 6.0°C | 108 mm | 80% | 0.4 m/s | 5.9 |
| 1986 | 21.2°C | 15.4°C | 9.7°C | 26.8°C | 0.8°C | 140 mm | 78% | 0.5 m/s | 6.1 |
| 1985 ❄️ | 20.0°C | 15.1°C | 10.3°C | 24.9°C | 6.5°C | 124 mm | 80% | 0.5 m/s | 5.4 |
| 1984 | 23.4°C | 17.7°C | 12.1°C | 28.8°C | 5.5°C | 57 mm | 79% | 0.5 m/s | 5.8 |
| 1983 | 23.7°C | 18.1°C | 12.6°C | 32.0°C | 3.2°C | 59 mm | 77% | 0.4 m/s | — |
| 1982 | 20.9°C | 16.1°C | 11.3°C | 27.3°C | 5.3°C | 103 mm | 79% | 0.4 m/s | — |
| 1981 | 23.2°C | 17.8°C | 12.4°C | 29.6°C | 5.2°C | 105 mm | 80% | 0.4 m/s | — |
Actual recorded June data for each year, 1981–2025 — sourced from NASA POWER.
The average high in June is around 23.3°C with lows near 12.7°C (mean 18°C), based on 45 years of NASA POWER data.
June averages 102 mm of rainfall in Cornwall, a relatively wet time of year. The wettest on record was 194 mm in 2002.
The hottest June reached 33.8°C in 2005. The coldest dipped to 0.8°C in 1986.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average June temperatures have risen by about 2.4°C. Daytime highs moved from 22.2°C to 24.9°C and overnight lows from 11.7°C to 13.9°C over the same span.
June is one of the warmer months of the year in Cornwall and a relatively wet time of year, so plan for around 23.3°C daytime highs and 12.7°C at night.
Not quite — June is the 10th coolest month in Cornwall, averaging 18°C.
For June in Cornwall, pack light layers you can adjust through the day, with typical highs of 23.3°C and lows of 12.7°C. Bring an umbrella or light rain jacket too.
Relative humidity in June averages 78% — quite humid.
Average wind speed in June is 0.4 m/s. The windiest June on record averaged 0.5 m/s (1984).
The wettest June on record was 2002 with 194 mm. On average, June sees 102 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 Cornwall 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.
