April is one of the cooler months of the year in Llanelli, with average highs near 10.9°C and lows around 7°C (mean 9°C). It is one of the drier months, averaging 68 mm of rainfall and 85% relative humidity across the period.
April is one of the cooler months of the year in Llanelli. Across 45 years of records, the warmest April in Llanelli was 2011 — when the month averaged 11.1°C — while the coldest was 1986 at 6°C. Typical April days reach 10.9°C with nights near 7°C. The long-term trend is warming, about 0.3°C per decade.
April is one of the drier months in Llanelli, averaging 68 mm of rainfall. The wettest April on record was 1998 with 137 mm, while the driest was 1984 at 12 mm.
Relative humidity in Llanelli during April averages 85%. The most humid April was 2018 at 89%, and the least humid was 2021 at 78%.
April receives about 4.4 kWh/m²/day of solar energy in Llanelli. The sunniest April was 2021 at 5.4 kWh/m²/day, and the cloudiest were 1991, 1992 and 2012 at 3.9.
Average wind speed in Llanelli during April is 4.6 m/s. The windiest April was 1994 at 6.1 m/s, while the calmest was 2007 at 3.4 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 8.2°C | 8.8°C | 9.1°C | 9.0°C | 9.7°C | +1.5°C |
| Avg High | 10.2°C | 10.6°C | 11.1°C | 11.0°C | 11.8°C | +1.6°C |
| Avg Low | 6.2°C | 6.9°C | 7.3°C | 7.1°C | 7.6°C | +1.4°C |
| Avg Rain | 59 mm | 77 mm | 70 mm | 64 mm | 71 mm | +12 mm |
April temperatures in Llanelli have risen by about 1.2°C between 1981–1985 and 2021–2025.
April has ranged from a record low of 1.1°C (2013) to a record high of 19.1°C (2025).
Rainfall in April is one of the drier months, averaging 68 mm, with a wettest year of 137 mm.
A good time to visit Llanelli
April is a good time to visit Llanelli, with days averaging 10.9°C and nights around 7°C (mean 9°C, cooler than Llanelli'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 | 13.2°C | 10.7°C | 8.2°C | 19.1°C | 5.7°C | 109 mm | 83% | 4.1 m/s | 4.8 |
| 2024 | 11.4°C | 9.9°C | 8.3°C | 13.1°C | 6.0°C | 119 mm | 87% | 5.5 m/s | 4 |
| 2023 | 11.4°C | 9.5°C | 7.6°C | 13.6°C | 4.5°C | 90 mm | 86% | 4.3 m/s | 4.1 |
| 2022 | 11.6°C | 9.6°C | 7.6°C | 14.7°C | 4.5°C | 40 mm | 83% | 4.3 m/s | 4.6 |
| 2021 | 10.3°C | 8.1°C | 5.9°C | 13.6°C | 3.8°C | 12 mm | 78% | 4 m/s | 5.4 |
| 2020 | 13.1°C | 10.5°C | 7.8°C | 17.4°C | 4.5°C | 56 mm | 84% | 3.9 m/s | 4.8 |
| 2019 | 11.7°C | 9.5°C | 7.3°C | 18.2°C | 4.1°C | 97 mm | 83% | 4.4 m/s | 4.1 |
| 2018 | 10.8°C | 9.0°C | 7.3°C | 16.2°C | 3.1°C | 118 mm | 89% | 4.4 m/s | 4.1 |
| 2017 | 11.2°C | 9.2°C | 7.3°C | 14.5°C | 5.2°C | 32 mm | 84% | 3.9 m/s | 4.4 |
| 2016 | 10.0°C | 8.2°C | 6.4°C | 12.9°C | 4.9°C | 60 mm | 82% | 4.9 m/s | 4.6 |
| 2015 | 11.7°C | 9.4°C | 7.1°C | 14.7°C | 5.0°C | 26 mm | 84% | 4.1 m/s | 5 |
| 2014 | 11.8°C | 9.9°C | 8.0°C | 14.0°C | 6.0°C | 68 mm | 87% | 3.9 m/s | 4.4 |
| 2013 | 8.9°C | 7.2°C | 5.4°C | 11.0°C | 1.1°C | 42 mm | 85% | 5.4 m/s | 4.4 |
| 2012 | 9.9°C | 8.2°C | 6.5°C | 12.3°C | 3.6°C | 126 mm | 84% | 5.5 m/s | 3.9 |
| 2011 🔥 | 13.5°C | 11.1°C | 8.7°C | 17.9°C | 6.8°C | 30 mm | 85% | 3.7 m/s | 4.9 |
| 2010 | 10.9°C | 8.7°C | 6.5°C | 14.3°C | 4.6°C | 39 mm | 85% | 3.7 m/s | 4.8 |
| 2009 | 11.5°C | 9.6°C | 7.8°C | 14.4°C | 5.5°C | 68 mm | 86% | 3.7 m/s | 4.4 |
| 2008 | 10.0°C | 8.3°C | 6.7°C | 12.9°C | 3.5°C | 71 mm | 85% | 4.9 m/s | 4.5 |
| 2007 | 13.6°C | 11.0°C | 8.4°C | 17.1°C | 4.5°C | 21 mm | 85% | 3.4 m/s | 4.8 |
| 2006 | 10.3°C | 8.6°C | 7.0°C | 13.5°C | 2.6°C | 38 mm | 87% | 4.4 m/s | 4.7 |
| 2005 | 10.9°C | 9.1°C | 7.3°C | 15.8°C | 4.6°C | 90 mm | 86% | 4.7 m/s | 4.4 |
| 2004 | 11.0°C | 9.3°C | 7.7°C | 15.9°C | 5.3°C | 69 mm | 86% | 4.6 m/s | 4.2 |
| 2003 | 12.0°C | 9.7°C | 7.5°C | 18.3°C | 3.3°C | 67 mm | 83% | 4.9 m/s | 4.6 |
| 2002 | 11.3°C | 9.3°C | 7.3°C | 13.0°C | 4.1°C | 58 mm | 84% | 5.1 m/s | 4.3 |
| 2001 | 9.9°C | 8.3°C | 6.7°C | 11.3°C | 4.7°C | 108 mm | 85% | 5 m/s | 4.1 |
| 2000 | 10.1°C | 8.2°C | 6.4°C | 14.4°C | 3.1°C | 113 mm | 85% | 4.8 m/s | 4.3 |
| 1999 | 10.9°C | 9.3°C | 7.7°C | 15.6°C | 3.7°C | 100 mm | 87% | 5.4 m/s | 4.2 |
| 1998 🌧️ | 9.7°C | 8.3°C | 6.8°C | 13.0°C | 3.0°C | 137 mm | 85% | 5.5 m/s | 4.1 |
| 1997 | 12.0°C | 9.7°C | 7.4°C | 15.6°C | 4.0°C | 28 mm | 84% | 3.7 m/s | 4.6 |
| 1996 | 10.2°C | 8.3°C | 6.4°C | 13.2°C | 2.6°C | 90 mm | 88% | 3.8 m/s | 4 |
| 1995 | 10.8°C | 8.9°C | 6.9°C | 15.1°C | 3.4°C | 35 mm | 87% | 4 m/s | 4.1 |
| 1994 | 9.9°C | 8.1°C | 6.2°C | 14.5°C | 3.9°C | 79 mm | 85% | 6.1 m/s | 4.3 |
| 1993 | 11.2°C | 9.5°C | 7.7°C | 16.7°C | 5.1°C | 80 mm | 88% | 4.9 m/s | 4 |
| 1992 | 10.2°C | 8.6°C | 6.9°C | 14.3°C | 3.4°C | 83 mm | 86% | 5.4 m/s | 3.9 |
| 1991 | 10.5°C | 8.4°C | 6.4°C | 14.8°C | 3.2°C | 104 mm | 84% | 5.7 m/s | 3.9 |
| 1990 | 10.7°C | 8.5°C | 6.3°C | 16.6°C | 3.3°C | 30 mm | 81% | 4.9 m/s | 4.6 |
| 1989 | 9.4°C | 7.5°C | 5.6°C | 12.3°C | 2.3°C | 73 mm | 82% | 4.6 m/s | 4.2 |
| 1988 | 11.0°C | 8.7°C | 6.5°C | 13.3°C | 3.2°C | 48 mm | 85% | 4.1 m/s | 4.2 |
| 1987 | 11.6°C | 9.6°C | 7.5°C | 16.9°C | 4.1°C | 65 mm | 88% | 3.9 m/s | 4.2 |
| 1986 ❄️ | 7.7°C | 6.0°C | 4.4°C | 11.3°C | 1.2°C | 73 mm | 85% | 4.7 m/s | 4 |
| 1985 | 10.5°C | 8.7°C | 6.8°C | 14.2°C | 3.7°C | 81 mm | 86% | 5.6 m/s | 4 |
| 1984 | 10.8°C | 8.4°C | 6.0°C | 16.2°C | 1.8°C | 12 mm | 82% | 4.1 m/s | 4.8 |
| 1983 | 9.0°C | 7.3°C | 5.6°C | 11.9°C | 3.6°C | 86 mm | 84% | 4.3 m/s | — |
| 1982 | 11.1°C | 8.9°C | 6.7°C | 14.1°C | 3.5°C | 44 mm | 84% | 3.8 m/s | — |
| 1981 | 10.9°C | 8.6°C | 6.4°C | 14.4°C | 3.6°C | 50 mm | 85% | 4.8 m/s | — |
Actual recorded April data for each year, 1981–2025 — sourced from NASA POWER.
The average high in April is around 10.9°C with lows near 7°C (mean 9°C), based on 45 years of NASA POWER data.
April averages 68 mm of rainfall in Llanelli, one of the drier months. The wettest on record was 137 mm in 1998.
The hottest April reached 19.1°C in 2025. The coldest dipped to 1.1°C in 2013.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average April temperatures have risen by about 1.2°C. Daytime highs moved from 10.5°C to 11.6°C and overnight lows from 6.3°C to 7.5°C over the same span.
April is one of the cooler months of the year in Llanelli and one of the drier months, so plan for around 10.9°C daytime highs and 7°C at night.
Not quite — April is the 5th coolest month in Llanelli, averaging 9°C.
For April in Llanelli, pack warm layers and a jacket for chilly mornings, with typical highs of 10.9°C and lows of 7°C. Bring an umbrella or light rain jacket too.
Relative humidity in April averages 85% — quite humid.
Average wind speed in April is 4.6 m/s. The windiest April on record averaged 6.1 m/s (1994).
The wettest April on record was 1998 with 137 mm. On average, April sees 68 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 Llanelli 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.
