April is one of the cooler months of the year in Harwich, with average highs near 11.9°C and lows around 5.1°C (mean 8.5°C). It is one of the drier months, averaging 44 mm of rainfall and 82% relative humidity across the period.
April is one of the cooler months of the year in Harwich. Across 45 years of records, the warmest April in Harwich was 2011 — when the month averaged 11.3°C — while the coldest were 1986 and 2021 at 5.9°C. Typical April days reach 11.9°C with nights near 5.1°C. The long-term trend is warming, about 0.4°C per decade.
April is one of the drier months in Harwich, averaging 44 mm of rainfall. The wettest April on record was 2000 with 108 mm, while the driest was 2007 at 2 mm.
Relative humidity in Harwich during April averages 82%. The most humid April was 2001 at 87%, and the least humid was 1997 at 77%.
April receives about 4 kWh/m²/day of solar energy in Harwich. The sunniest April was 2025 at 5 kWh/m²/day, and the cloudiest was 1989 at 3.
Average wind speed in Harwich during April is 3.9 m/s. The windiest April was 2024 at 5 m/s, while the calmest were 1996 and 2009 at 3.2 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 7.4°C | 8.5°C | 8.9°C | 8.9°C | 8.9°C | +1.5°C |
| Avg High | 10.8°C | 11.9°C | 12.3°C | 12.3°C | 12.5°C | +1.7°C |
| Avg Low | 4.1°C | 5.0°C | 5.5°C | 5.4°C | 5.4°C | +1.3°C |
| Avg Rain | 54 mm | 45 mm | 44 mm | 38 mm | 35 mm | -19 mm |
April temperatures in Harwich have risen by about 1.3°C between 1981–1985 and 2021–2025.
April has ranged from a record low of -1.7°C (2021) to a record high of 21.4°C (2011).
Rainfall in April is one of the drier months, averaging 44 mm, with a wettest year of 108 mm.
A good time to visit Harwich
April is a good time to visit Harwich, with days averaging 11.9°C and nights around 5.1°C (mean 8.5°C, cooler than Harwich's yearly average) and moderate rainfall. August and July 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 | 14.2°C | 10.4°C | 6.6°C | 19.4°C | 3.3°C | 22 mm | 82% | 3.3 m/s | 5 |
| 2024 | 12.9°C | 9.8°C | 6.7°C | 17.7°C | 2.4°C | 69 mm | 83% | 5 m/s | 3.9 |
| 2023 | 12.1°C | 8.7°C | 5.3°C | 15.1°C | 2.6°C | 60 mm | 81% | 4 m/s | 4.2 |
| 2022 | 12.6°C | 9.0°C | 5.4°C | 16.8°C | 0.1°C | 15 mm | 81% | 4.3 m/s | 4.3 |
| 2021 | 9.6°C | 5.9°C | 2.3°C | 13.0°C | -1.7°C | 10 mm | 79% | 3.7 m/s | 4.6 |
| 2020 | 13.5°C | 9.6°C | 5.8°C | 19.5°C | 0.9°C | 35 mm | 80% | 3.6 m/s | 4.8 |
| 2019 | 12.3°C | 9.0°C | 5.7°C | 18.1°C | 2.1°C | 16 mm | 81% | 3.7 m/s | 4.1 |
| 2018 | 12.6°C | 9.7°C | 6.8°C | 20.1°C | 3.2°C | 92 mm | 87% | 3.9 m/s | 3.6 |
| 2017 | 12.7°C | 8.8°C | 5.0°C | 17.7°C | 1.0°C | 12 mm | 80% | 3.4 m/s | 4.4 |
| 2016 | 10.8°C | 7.6°C | 4.3°C | 14.7°C | 1.4°C | 61 mm | 82% | 3.8 m/s | 4.2 |
| 2015 | 12.3°C | 8.4°C | 4.5°C | 19.5°C | 2.3°C | 26 mm | 81% | 3.5 m/s | 4.6 |
| 2014 | 13.9°C | 10.5°C | 7.2°C | 16.5°C | 3.0°C | 24 mm | 84% | 3.5 m/s | 4.2 |
| 2013 | 10.3°C | 7.0°C | 3.6°C | 17.5°C | -0.4°C | 29 mm | 82% | 4.2 m/s | 4.2 |
| 2012 | 10.8°C | 7.7°C | 4.5°C | 15.0°C | -0.8°C | 98 mm | 83% | 4.1 m/s | 3.7 |
| 2011 🔥 | 15.3°C | 11.3°C | 7.3°C | 21.4°C | 3.9°C | 6 mm | 81% | 3.4 m/s | 4.7 |
| 2010 | 12.4°C | 8.6°C | 4.8°C | 16.7°C | 2.0°C | 17 mm | 80% | 3.3 m/s | 4.6 |
| 2009 | 13.7°C | 10.0°C | 6.3°C | 16.7°C | 3.4°C | 21 mm | 85% | 3.2 m/s | 4.2 |
| 2008 | 11.2°C | 8.1°C | 5.0°C | 17.1°C | -1.2°C | 43 mm | 82% | 3.9 m/s | 4 |
| 2007 | 15.3°C | 11.1°C | 6.8°C | 20.1°C | 2.4°C | 2 mm | 82% | 3.3 m/s | 4.7 |
| 2006 | 11.7°C | 8.2°C | 4.8°C | 15.5°C | 0.0°C | 32 mm | 82% | 3.7 m/s | 3.9 |
| 2005 | 12.3°C | 8.9°C | 5.5°C | 16.7°C | 0.1°C | 44 mm | 84% | 3.4 m/s | 3.9 |
| 2004 | 12.6°C | 9.3°C | 5.9°C | 18.8°C | 2.2°C | 54 mm | 84% | 3.5 m/s | 3.8 |
| 2003 | 11.9°C | 8.5°C | 5.2°C | 17.7°C | 0.3°C | 29 mm | 82% | 4 m/s | 4.2 |
| 2002 | 12.6°C | 9.1°C | 5.7°C | 18.5°C | 2.6°C | 35 mm | 81% | 4.1 m/s | 4.4 |
| 2001 | 10.2°C | 7.4°C | 4.6°C | 14.8°C | 1.2°C | 71 mm | 87% | 4.4 m/s | 3.6 |
| 2000 🌧️ | 11.4°C | 8.4°C | 5.5°C | 16.2°C | 0.6°C | 108 mm | 85% | 3.8 m/s | 3.4 |
| 1999 | 12.4°C | 9.2°C | 6.0°C | 15.9°C | -0.3°C | 47 mm | 83% | 3.9 m/s | 3.9 |
| 1998 | 11.0°C | 8.3°C | 5.7°C | 16.7°C | 0.5°C | 92 mm | 86% | 4.1 m/s | 3.5 |
| 1997 | 12.5°C | 8.6°C | 4.6°C | 16.7°C | 1.1°C | 16 mm | 77% | 3.6 m/s | 4.1 |
| 1996 | 11.4°C | 7.8°C | 4.3°C | 17.7°C | -1.5°C | 19 mm | 82% | 3.2 m/s | 3.9 |
| 1995 | 12.5°C | 8.7°C | 4.9°C | 16.8°C | 0.0°C | 19 mm | 82% | 3.9 m/s | 3.7 |
| 1994 | 11.2°C | 7.9°C | 4.6°C | 18.3°C | 1.3°C | 60 mm | 82% | 4.8 m/s | 4 |
| 1993 | 12.9°C | 9.5°C | 6.1°C | 20.8°C | 2.5°C | 68 mm | 85% | 3.8 m/s | 3.5 |
| 1992 | 11.7°C | 8.4°C | 5.0°C | 17.2°C | 0.7°C | 41 mm | 81% | 4.2 m/s | 3.5 |
| 1991 | 11.4°C | 8.0°C | 4.5°C | 17.2°C | 0.6°C | 50 mm | 80% | 4.8 m/s | 3.8 |
| 1990 | 11.9°C | 8.1°C | 4.2°C | 17.5°C | -0.6°C | 39 mm | 78% | 4.1 m/s | 4.6 |
| 1989 | 9.5°C | 6.6°C | 3.8°C | 13.0°C | -0.5°C | 75 mm | 83% | 4.2 m/s | 3 |
| 1988 | 11.0°C | 7.7°C | 4.4°C | 15.8°C | -0.8°C | 44 mm | 83% | 3.7 m/s | 3.6 |
| 1987 | 12.8°C | 9.2°C | 5.7°C | 17.7°C | 1.8°C | 43 mm | 86% | 3.5 m/s | 3.6 |
| 1986 ❄️ | 8.9°C | 5.9°C | 2.8°C | 14.0°C | -1.2°C | 64 mm | 84% | 4.1 m/s | 3.4 |
| 1985 | 11.1°C | 7.9°C | 4.6°C | 16.6°C | -0.5°C | 48 mm | 83% | 4.6 m/s | 3.6 |
| 1984 | 10.8°C | 7.0°C | 3.2°C | 17.2°C | -0.7°C | 26 mm | 80% | 3.4 m/s | 4.5 |
| 1983 | 10.3°C | 7.0°C | 3.7°C | 14.4°C | 0.0°C | 100 mm | 86% | 3.9 m/s | — |
| 1982 | 11.3°C | 7.6°C | 4.0°C | 13.9°C | 0.7°C | 21 mm | 82% | 3.6 m/s | — |
| 1981 | 11.1°C | 7.9°C | 4.8°C | 16.8°C | 0.9°C | 64 mm | 83% | 4 m/s | — |
Actual recorded April data for each year, 1981–2025 — sourced from NASA POWER.
The average high in April is around 11.9°C with lows near 5.1°C (mean 8.5°C), based on 45 years of NASA POWER data.
April averages 44 mm of rainfall in Harwich, one of the drier months. The wettest on record was 108 mm in 2000.
The hottest April reached 21.4°C in 2011. The coldest dipped to -1.7°C in 2021.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average April temperatures have risen by about 1.3°C. Daytime highs moved from 10.9°C to 12.3°C and overnight lows from 4.1°C to 5.3°C over the same span.
April is one of the cooler months of the year in Harwich and one of the drier months, so plan for around 11.9°C daytime highs and 5.1°C at night.
Not quite — April is the 6th coolest month in Harwich, averaging 8.5°C.
For April in Harwich, pack warm layers and a jacket for chilly mornings, with typical highs of 11.9°C and lows of 5.1°C.
Relative humidity in April averages 82% — quite humid.
Average wind speed in April is 3.9 m/s. The windiest April on record averaged 5 m/s (2024).
The wettest April on record was 2000 with 108 mm. On average, April sees 44 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 Harwich 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.
