April is one of the cooler months of the year in Swansea, with average highs near 11.4°C and lows around 5.8°C (mean 8.6°C). It is one of the drier months, averaging 64 mm of rainfall and 85% relative humidity across the period.
April is one of the cooler months of the year in Swansea. Across 45 years of records, the warmest April in Swansea was 2011 — when the month averaged 11.1°C — while the coldest was 1986 at 5.6°C. Typical April days reach 11.4°C with nights near 5.8°C. The long-term trend is warming, about 0.3°C per decade.
April is one of the drier months in Swansea, averaging 64 mm of rainfall. The wettest April on record was 2000 with 137 mm, while the driest was 1984 at 11 mm.
Relative humidity in Swansea during April averages 85%. The most humid April was 2018 at 89%, and the least humid was 2021 at 79%.
April receives about 4 kWh/m²/day of solar energy in Swansea. The sunniest April was 2015 at 4.9 kWh/m²/day, and the cloudiest was 1993 at 3.1.
Average wind speed in Swansea during April is 4.1 m/s. The windiest April was 1994 at 5.3 m/s, while the calmest was 2007 at 3.1 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 7.8°C | 8.4°C | 8.8°C | 8.8°C | 9.3°C | +1.5°C |
| Avg High | 10.6°C | 11.1°C | 11.5°C | 11.6°C | 12.4°C | +1.8°C |
| Avg Low | 4.9°C | 5.8°C | 6.2°C | 5.9°C | 6.3°C | +1.4°C |
| Avg Rain | 57 mm | 74 mm | 70 mm | 59 mm | 60 mm | +4 mm |
April temperatures in Swansea have risen by about 1.1°C between 1981–1985 and 2021–2025.
April has ranged from a record low of -0.7°C (2013) to a record high of 20.4°C (2025).
Rainfall in April is one of the drier months, averaging 64 mm, with a wettest year of 137 mm.
A good time to visit Swansea
April is a good time to visit Swansea, with days averaging 11.4°C and nights around 5.8°C (mean 8.6°C, cooler than Swansea's yearly average) and moderate 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 | 14.0°C | 10.4°C | 6.9°C | 20.4°C | 3.9°C | 75 mm | 82% | 3.6 m/s | 4.8 |
| 2024 | 11.7°C | 9.5°C | 7.2°C | 14.2°C | 3.9°C | 99 mm | 87% | 4.8 m/s | 3.7 |
| 2023 | 11.7°C | 8.9°C | 6.2°C | 15.5°C | 1.8°C | 83 mm | 86% | 3.8 m/s | 3.8 |
| 2022 | 12.2°C | 9.2°C | 6.3°C | 16.2°C | 2.2°C | 35 mm | 83% | 3.9 m/s | 4.1 |
| 2021 | 10.6°C | 7.4°C | 4.3°C | 14.2°C | 2.1°C | 15 mm | 79% | 3.5 m/s | 4.8 |
| 2020 | 13.9°C | 10.2°C | 6.6°C | 18.5°C | 2.6°C | 56 mm | 83% | 3.6 m/s | 4.8 |
| 2019 | 12.1°C | 9.1°C | 6.1°C | 18.8°C | 2.0°C | 83 mm | 83% | 3.9 m/s | 4.1 |
| 2018 | 11.4°C | 8.9°C | 6.4°C | 17.4°C | 1.4°C | 103 mm | 89% | 4 m/s | 3.5 |
| 2017 | 11.9°C | 8.9°C | 5.8°C | 15.5°C | 3.4°C | 31 mm | 84% | 3.4 m/s | 4.3 |
| 2016 | 10.2°C | 7.7°C | 5.2°C | 13.4°C | 2.9°C | 50 mm | 83% | 4.2 m/s | 4.1 |
| 2015 | 12.4°C | 9.2°C | 5.9°C | 15.8°C | 3.6°C | 23 mm | 84% | 3.7 m/s | 4.9 |
| 2014 | 12.3°C | 9.6°C | 7.0°C | 14.3°C | 4.1°C | 71 mm | 87% | 3.5 m/s | 3.8 |
| 2013 | 9.2°C | 6.7°C | 4.3°C | 12.0°C | -0.7°C | 36 mm | 86% | 4.8 m/s | 3.9 |
| 2012 | 10.1°C | 7.8°C | 5.4°C | 12.9°C | 1.8°C | 129 mm | 85% | 4.9 m/s | 3.6 |
| 2011 🔥 | 14.5°C | 11.1°C | 7.7°C | 19.2°C | 5.0°C | 24 mm | 85% | 3.3 m/s | 4.6 |
| 2010 | 11.6°C | 8.5°C | 5.3°C | 15.6°C | 2.8°C | 36 mm | 85% | 3.3 m/s | 4.6 |
| 2009 | 12.1°C | 9.4°C | 6.7°C | 15.4°C | 3.8°C | 60 mm | 86% | 3.3 m/s | 4.1 |
| 2008 | 10.4°C | 7.9°C | 5.5°C | 14.7°C | 2.3°C | 65 mm | 86% | 4.3 m/s | 4.1 |
| 2007 | 14.6°C | 11.0°C | 7.5°C | 18.5°C | 2.9°C | 18 mm | 84% | 3.1 m/s | 4.8 |
| 2006 | 10.8°C | 8.4°C | 5.9°C | 14.2°C | 0.3°C | 35 mm | 87% | 4 m/s | 4 |
| 2005 | 11.4°C | 8.8°C | 6.2°C | 17.4°C | 2.5°C | 83 mm | 86% | 4.1 m/s | 3.9 |
| 2004 | 11.6°C | 9.2°C | 6.7°C | 17.0°C | 2.9°C | 72 mm | 86% | 4 m/s | 3.7 |
| 2003 | 12.5°C | 9.3°C | 6.2°C | 19.8°C | 0.7°C | 62 mm | 83% | 4.4 m/s | 4 |
| 2002 | 11.8°C | 9.0°C | 6.1°C | 15.2°C | 3.0°C | 57 mm | 84% | 4.6 m/s | 4.2 |
| 2001 | 10.0°C | 7.7°C | 5.5°C | 11.8°C | 2.5°C | 108 mm | 86% | 4.3 m/s | 3.4 |
| 2000 🌧️ | 10.2°C | 7.7°C | 5.2°C | 15.2°C | 1.6°C | 137 mm | 86% | 4.3 m/s | 3.4 |
| 1999 | 11.3°C | 9.0°C | 6.7°C | 16.5°C | 1.5°C | 98 mm | 87% | 4.7 m/s | 3.6 |
| 1998 | 9.9°C | 7.8°C | 5.7°C | 13.3°C | 2.2°C | 132 mm | 86% | 4.8 m/s | 3.5 |
| 1997 | 12.6°C | 9.3°C | 6.0°C | 16.8°C | 2.3°C | 29 mm | 83% | 3.4 m/s | 4.1 |
| 1996 | 10.8°C | 7.9°C | 5.1°C | 14.5°C | -0.3°C | 89 mm | 87% | 3.4 m/s | 3.6 |
| 1995 | 11.6°C | 8.8°C | 6.0°C | 16.2°C | 2.3°C | 30 mm | 86% | 3.7 m/s | 3.9 |
| 1994 | 10.3°C | 7.7°C | 5.1°C | 16.8°C | 1.8°C | 75 mm | 86% | 5.3 m/s | 3.9 |
| 1993 | 11.8°C | 9.3°C | 6.8°C | 18.9°C | 3.4°C | 80 mm | 88% | 4.4 m/s | 3.1 |
| 1992 | 10.8°C | 8.4°C | 5.9°C | 15.3°C | 1.2°C | 80 mm | 85% | 4.8 m/s | 3.6 |
| 1991 | 11.0°C | 8.1°C | 5.2°C | 15.6°C | 1.5°C | 94 mm | 84% | 5.1 m/s | 3.5 |
| 1990 | 11.1°C | 8.1°C | 5.0°C | 17.9°C | 0.4°C | 32 mm | 81% | 4.4 m/s | 4.5 |
| 1989 | 9.5°C | 6.8°C | 4.2°C | 13.1°C | 1.1°C | 70 mm | 84% | 4 m/s | 3.5 |
| 1988 | 11.5°C | 8.4°C | 5.3°C | 14.3°C | 1.9°C | 43 mm | 85% | 3.8 m/s | 3.9 |
| 1987 | 12.4°C | 9.5°C | 6.6°C | 17.7°C | 2.7°C | 61 mm | 87% | 3.5 m/s | 3.7 |
| 1986 ❄️ | 8.0°C | 5.6°C | 3.2°C | 12.0°C | -0.4°C | 69 mm | 86% | 4.1 m/s | 3.5 |
| 1985 | 10.9°C | 8.3°C | 5.8°C | 15.1°C | 1.9°C | 79 mm | 86% | 5 m/s | 3.6 |
| 1984 | 11.4°C | 8.0°C | 4.5°C | 17.3°C | -0.3°C | 11 mm | 82% | 3.6 m/s | 4.7 |
| 1983 | 9.2°C | 6.8°C | 4.3°C | 13.0°C | 1.3°C | 95 mm | 86% | 3.9 m/s | — |
| 1982 | 11.7°C | 8.5°C | 5.4°C | 15.7°C | 2.2°C | 41 mm | 84% | 3.4 m/s | — |
| 1981 | 11.2°C | 8.2°C | 5.2°C | 15.4°C | 2.2°C | 43 mm | 85% | 4.4 m/s | — |
Actual recorded April data for each year, 1981–2025 — sourced from NASA POWER.
The average high in April is around 11.4°C with lows near 5.8°C (mean 8.6°C), based on 45 years of NASA POWER data.
April averages 64 mm of rainfall in Swansea, one of the drier months. The wettest on record was 137 mm in 2000.
The hottest April reached 20.4°C in 2025. The coldest dipped to -0.7°C in 2013.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average April temperatures have risen by about 1.1°C. Daytime highs moved from 10.9°C to 12°C and overnight lows from 5°C to 6.2°C over the same span.
April is one of the cooler months of the year in Swansea and one of the drier months, so plan for around 11.4°C daytime highs and 5.8°C at night.
Not quite — April is the 5th coolest month in Swansea, averaging 8.6°C.
For April in Swansea, pack warm layers and a jacket for chilly mornings, with typical highs of 11.4°C and lows of 5.8°C. Bring an umbrella or light rain jacket too.
Relative humidity in April averages 85% — quite humid.
Average wind speed in April is 4.1 m/s. The windiest April on record averaged 5.3 m/s (1994).
The wettest April on record was 2000 with 137 mm. On average, April sees 64 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 Swansea 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.
