April is one of the cooler months of the year in Cornwall, with average highs near 11.6°C and lows around 0.3°C (mean 6°C). It is about average for rainfall, averaging 82 mm of rainfall and 78% relative humidity across the period.
April is one of the cooler months of the year in Cornwall. Across 45 years of records, the warmest April in Cornwall was 2010 — when the month averaged 9.2°C — while the coldest was 2018 at 2.7°C. Typical April days reach 11.6°C with nights near 0.3°C. The long-term April temperature trend is broadly flat.
April is about average for rainfall in Cornwall, averaging 82 mm of rainfall. The wettest April on record was 1993 with 159 mm, while the driest was 1999 at 20 mm.
Relative humidity in Cornwall during April averages 78%. The most humid April was 1993 at 85%, and the least humid was 2021 at 72%.
April receives about 4.6 kWh/m²/day of solar energy in Cornwall. The sunniest Aprils were 1999 and 2016 at 5.4 kWh/m²/day, and the cloudiest was 1993 at 3.7.
Average wind speed in Cornwall during April is 0.8 m/s. The windiest April was 1982 at 1 m/s, while the calmest were 1992, 1993 and 2010, among others at 0.7 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 6.0°C | 5.6°C | 6.0°C | 5.7°C | 6.7°C | +0.7°C |
| Avg High | 11.5°C | 11.0°C | 11.7°C | 11.5°C | 12.5°C | +1°C |
| Avg Low | 0.5°C | 0.1°C | 0.4°C | 0.0°C | 0.9°C | +0.4°C |
| Avg Rain | 72 mm | 86 mm | 84 mm | 90 mm | 72 mm | 0 mm |
April temperatures in Cornwall have risen by about 1.8°C between 1981–1985 and 2021–2025.
April has ranged from a record low of -13.6°C (1982) to a record high of 28°C (2010).
Rainfall in April is about average for rainfall, averaging 82 mm, with a wettest year of 159 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.2°C per decade while lows rose 0°C per decade, widening the gap between day and night.
A good time to visit Cornwall
April is a good time to visit Cornwall, with days averaging 11.6°C and nights around 0.3°C (mean 6°C, close to Cornwall's yearly average) and higher rainfall. July and August are marginally more temperate, but April still suits most travellers.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 12.4°C | 6.4°C | 0.3°C | 26.0°C | -8.6°C | 89 mm | 75% | 0.8 m/s | 4.5 |
| 2024 | 12.8°C | 7.1°C | 1.3°C | 22.8°C | -5.9°C | 89 mm | 77% | 0.8 m/s | 4.1 |
| 2023 | 14.2°C | 8.2°C | 2.1°C | 27.0°C | -7.6°C | 83 mm | 75% | 0.8 m/s | 4.4 |
| 2022 | 11.9°C | 6.0°C | 0.1°C | 19.9°C | -4.5°C | 74 mm | 74% | 0.8 m/s | 4.4 |
| 2021 | 13.9°C | 8.0°C | 2.1°C | 24.5°C | -5.8°C | 50 mm | 72% | 0.8 m/s | 4.9 |
| 2020 | 10.0°C | 4.7°C | -0.7°C | 20.3°C | -5.5°C | 45 mm | 74% | 0.9 m/s | 4.5 |
| 2019 | 11.2°C | 5.5°C | -0.3°C | 18.9°C | -7.4°C | 112 mm | 78% | 0.9 m/s | 4.2 |
| 2018 ❄️ | 6.8°C | 2.7°C | -1.5°C | 18.0°C | -8.8°C | 109 mm | 81% | 0.9 m/s | 3.9 |
| 2017 | 13.6°C | 7.7°C | 1.9°C | 25.8°C | -3.4°C | 120 mm | 80% | 0.8 m/s | 4 |
| 2016 | 9.3°C | 3.0°C | -3.2°C | 22.4°C | -11.4°C | 52 mm | 73% | 0.8 m/s | 5.4 |
| 2015 | 11.9°C | 6.1°C | 0.2°C | 21.5°C | -8.5°C | 65 mm | 74% | 0.8 m/s | 5 |
| 2014 | 11.8°C | 5.9°C | 0.0°C | 24.5°C | -8.6°C | 105 mm | 77% | 0.9 m/s | 4.5 |
| 2013 | 11.8°C | 5.8°C | -0.1°C | 22.5°C | -5.6°C | 56 mm | 73% | 0.9 m/s | 4.4 |
| 2012 | 11.1°C | 5.4°C | -0.2°C | 26.5°C | -4.7°C | 69 mm | 76% | 0.8 m/s | 4.6 |
| 2011 | 11.8°C | 6.0°C | 0.3°C | 24.6°C | -5.9°C | 155 mm | 80% | 0.8 m/s | 4.3 |
| 2010 🔥 | 15.6°C | 9.2°C | 2.9°C | 28.0°C | -1.2°C | 54 mm | 76% | 0.7 m/s | 4.8 |
| 2009 | 12.4°C | 6.4°C | 0.3°C | 26.7°C | -4.7°C | 79 mm | 79% | 0.8 m/s | 4.6 |
| 2008 | 14.7°C | 8.4°C | 2.0°C | 24.4°C | -5.2°C | 69 mm | 78% | 0.8 m/s | 5.1 |
| 2007 | 10.1°C | 5.5°C | 0.9°C | 22.7°C | -5.6°C | 103 mm | 81% | 0.8 m/s | 3.8 |
| 2006 | 12.9°C | 6.8°C | 0.7°C | 20.1°C | -6.1°C | 67 mm | 79% | 0.8 m/s | 4.6 |
| 2005 | 12.8°C | 6.7°C | 0.6°C | 20.6°C | -4.0°C | 128 mm | 78% | 0.8 m/s | 4.4 |
| 2004 | 10.6°C | 5.3°C | 0.1°C | 24.5°C | -8.4°C | 77 mm | 79% | 0.8 m/s | 4.5 |
| 2003 | 10.1°C | 4.3°C | -1.4°C | 22.8°C | -11.2°C | 56 mm | 76% | 0.8 m/s | 4.4 |
| 2002 | 11.7°C | 6.4°C | 1.1°C | 26.5°C | -5.8°C | 102 mm | 78% | 0.8 m/s | 4.3 |
| 2001 | 12.9°C | 6.3°C | -0.3°C | 24.1°C | -4.0°C | 24 mm | 77% | 0.8 m/s | 5.3 |
| 2000 | 9.1°C | 4.3°C | -0.5°C | 20.5°C | -8.6°C | 134 mm | 84% | 0.8 m/s | 4.1 |
| 1999 | 12.4°C | 6.1°C | -0.2°C | 19.2°C | -4.7°C | 20 mm | 75% | 0.8 m/s | 5.4 |
| 1998 | 13.4°C | 7.1°C | 0.8°C | 19.9°C | -4.0°C | 47 mm | 76% | 0.8 m/s | 5.3 |
| 1997 | 10.5°C | 4.9°C | -0.7°C | 20.0°C | -9.6°C | 66 mm | 78% | 0.8 m/s | 5 |
| 1996 | 8.8°C | 3.9°C | -1.0°C | 17.3°C | -8.1°C | 123 mm | 81% | 0.8 m/s | 4.3 |
| 1995 | 8.9°C | 3.3°C | -2.2°C | 17.3°C | -11.0°C | 58 mm | 73% | 0.8 m/s | 4.6 |
| 1994 | 11.4°C | 5.9°C | 0.4°C | 23.5°C | -8.5°C | 102 mm | 82% | 0.8 m/s | 4.4 |
| 1993 🌧️ | 11.1°C | 5.9°C | 0.7°C | 21.8°C | -3.3°C | 159 mm | 85% | 0.7 m/s | 3.7 |
| 1992 | 9.5°C | 4.4°C | -0.7°C | 23.3°C | -9.3°C | 52 mm | 81% | 0.7 m/s | 5.1 |
| 1991 | 12.8°C | 7.7°C | 2.6°C | 21.7°C | -4.5°C | 127 mm | 83% | 0.8 m/s | 4.4 |
| 1990 | 11.1°C | 6.4°C | 1.6°C | 26.8°C | -6.6°C | 109 mm | 84% | 0.8 m/s | 4.4 |
| 1989 | 9.5°C | 4.1°C | -1.3°C | 17.2°C | -5.8°C | 43 mm | 77% | 0.7 m/s | 4.9 |
| 1988 | 11.8°C | 6.6°C | 1.4°C | 20.2°C | -3.2°C | 90 mm | 80% | 0.8 m/s | 4.1 |
| 1987 | 14.1°C | 8.6°C | 3.1°C | 26.6°C | -4.7°C | 59 mm | 80% | 0.8 m/s | 4.5 |
| 1986 | 14.3°C | 8.0°C | 1.7°C | 26.1°C | -4.9°C | 35 mm | 78% | 0.8 m/s | 5.2 |
| 1985 | 10.6°C | 5.3°C | 0.0°C | 20.7°C | -8.3°C | 63 mm | 79% | 0.8 m/s | 4.8 |
| 1984 | 12.3°C | 6.7°C | 1.2°C | 23.1°C | -4.4°C | 100 mm | 82% | 0.7 m/s | 4.7 |
| 1983 | 9.7°C | 4.8°C | -0.2°C | 19.1°C | -6.2°C | 120 mm | 84% | 0.7 m/s | — |
| 1982 | 9.0°C | 3.4°C | -2.2°C | 22.2°C | -13.6°C | 53 mm | 78% | 1 m/s | — |
| 1981 | 12.4°C | 6.4°C | 0.4°C | 19.7°C | -6.5°C | 81 mm | 77% | 0.9 m/s | — |
Actual recorded April data for each year, 1981–2025 — sourced from NASA POWER.
The average high in April is around 11.6°C with lows near 0.3°C (mean 6°C), based on 45 years of NASA POWER data.
April averages 82 mm of rainfall in Cornwall, about average for rainfall. The wettest on record was 159 mm in 1993.
The hottest April reached 28°C in 2010. The coldest dipped to -13.6°C in 1982.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average April temperatures have risen by about 1.8°C. Daytime highs moved from 10.8°C to 13°C and overnight lows from -0.2°C to 1.2°C over the same span.
April is one of the cooler months of the year in Cornwall and about average for rainfall, so plan for around 11.6°C daytime highs and 0.3°C at night.
Not quite — April is the 6th coolest month in Cornwall, averaging 6°C.
For April in Cornwall, pack warm layers and a jacket for chilly mornings, with typical highs of 11.6°C and lows of 0.3°C. Bring an umbrella or light rain jacket too.
Relative humidity in April averages 78% — quite humid.
Average wind speed in April is 0.8 m/s. The windiest April on record averaged 1 m/s (1982).
The wettest April on record was 1993 with 159 mm. On average, April sees 82 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 April, 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 April specifically, along with year-by-year records and how the month has changed over the decades.
