March is one of the cooler months of the year in Llanelli, with average highs near 9°C and lows around 5.8°C (mean 7.4°C). It is about average for rainfall, averaging 87 mm of rainfall and 87% relative humidity across the period.
March is one of the cooler months of the year in Llanelli. Across 45 years of records, the warmest Marchs in Llanelli were 1998 and 2012 — when the month averaged 8.7°C — while the coldest was 2013 at 4.5°C. Typical March days reach 9°C with nights near 5.8°C. The long-term trend is warming, about 0.2°C per decade.
March is about average for rainfall in Llanelli, averaging 87 mm of rainfall. The wettest March on record was 1981 with 180 mm, while the driest was 1990 at 24 mm.
Relative humidity in Llanelli during March averages 87%. The most humid March was 2024 at 90%, and the least humid was 1995 at 84%.
March receives about 2.7 kWh/m²/day of solar energy in Llanelli. The sunniest Marchs were 2011, 2020 and 2022 at 3.2 kWh/m²/day, and the cloudiest was 1996 at 2.2.
Average wind speed in Llanelli during March is 5.3 m/s. The windiest Marchs were 1994 and 2008 at 6.7 m/s, while the calmest was 2011 at 3.7 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 6.8°C | 7.7°C | 7.5°C | 7.1°C | 8.0°C | +1.2°C |
| Avg High | 8.3°C | 9.2°C | 9.1°C | 8.8°C | 9.7°C | +1.4°C |
| Avg Low | 5.2°C | 6.1°C | 5.9°C | 5.5°C | 6.3°C | +1.1°C |
| Avg Rain | 104 mm | 73 mm | 75 mm | 90 mm | 100 mm | -4 mm |
March temperatures in Llanelli have risen by about 1.4°C between 1981–1985 and 2021–2025.
March has ranged from a record low of -3.1°C (2018) to a record high of 15.3°C (2012).
Rainfall in March is about average for rainfall, averaging 87 mm, with a wettest year of 180 mm.
A quieter season to visit Llanelli
If your dates are flexible, the more temperate months of August and July tend to be the most comfortable for visiting Llanelli. That said, March — with days averaging 9°C and nights around 5.8°C (mean 7.4°C) and higher rainfall (87 mm) — can still be rewarding for travellers who don't mind the cooler conditions, and often means fewer crowds.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 10.2°C | 8.3°C | 6.3°C | 13.7°C | 3.3°C | 25 mm | 86% | 3.9 m/s | 3.1 |
| 2024 | 9.8°C | 8.5°C | 7.1°C | 11.7°C | 4.3°C | 153 mm | 90% | 5.4 m/s | 2.7 |
| 2023 | 9.3°C | 7.9°C | 6.5°C | 11.8°C | 2.3°C | 179 mm | 89% | 5.6 m/s | 2.3 |
| 2022 | 10.4°C | 8.4°C | 6.4°C | 14.9°C | 3.6°C | 53 mm | 86% | 4.9 m/s | 3.2 |
| 2021 | 9.2°C | 7.7°C | 6.2°C | 14.3°C | 3.2°C | 74 mm | 87% | 5.1 m/s | 2.7 |
| 2020 | 9.1°C | 7.3°C | 5.5°C | 11.8°C | 3.3°C | 117 mm | 86% | 6.1 m/s | 3.2 |
| 2019 | 9.7°C | 8.3°C | 6.8°C | 11.0°C | 5.1°C | 153 mm | 88% | 5.7 m/s | 2.8 |
| 2018 | 7.2°C | 5.7°C | 4.1°C | 10.1°C | -3.1°C | 152 mm | 89% | 5.5 m/s | 2.6 |
| 2017 | 10.1°C | 8.6°C | 7.1°C | 13.0°C | 4.3°C | 135 mm | 89% | 5.4 m/s | 2.5 |
| 2016 | 8.5°C | 6.8°C | 5.1°C | 11.1°C | 3.1°C | 105 mm | 86% | 5.1 m/s | 3 |
| 2015 | 8.7°C | 6.9°C | 5.2°C | 10.4°C | 2.7°C | 82 mm | 87% | 5.5 m/s | 3 |
| 2014 | 9.4°C | 7.8°C | 6.2°C | 13.2°C | 3.7°C | 44 mm | 89% | 4.8 m/s | 2.7 |
| 2013 ❄️ | 6.1°C | 4.5°C | 2.9°C | 10.3°C | -0.6°C | 79 mm | 85% | 5.4 m/s | 2.5 |
| 2012 | 10.5°C | 8.7°C | 7.0°C | 15.3°C | 5.1°C | 27 mm | 88% | 3.8 m/s | 2.9 |
| 2011 | 9.4°C | 7.5°C | 5.6°C | 14.0°C | 1.1°C | 34 mm | 88% | 3.7 m/s | 3.2 |
| 2010 | 8.1°C | 6.4°C | 4.7°C | 10.1°C | 0.9°C | 87 mm | 89% | 4.6 m/s | 2.9 |
| 2009 | 9.0°C | 7.4°C | 5.9°C | 11.4°C | 3.1°C | 49 mm | 88% | 5 m/s | 3.1 |
| 2008 | 8.9°C | 7.4°C | 5.9°C | 11.3°C | 3.3°C | 107 mm | 84% | 6.7 m/s | 2.9 |
| 2007 | 9.8°C | 8.1°C | 6.4°C | 13.0°C | 2.6°C | 75 mm | 86% | 5.6 m/s | 3 |
| 2006 | 7.6°C | 6.2°C | 4.8°C | 10.9°C | 2.1°C | 109 mm | 86% | 6.3 m/s | 2.5 |
| 2005 | 9.3°C | 7.6°C | 6.0°C | 13.7°C | 0.8°C | 65 mm | 88% | 4.7 m/s | 2.5 |
| 2004 | 8.9°C | 7.2°C | 5.6°C | 12.9°C | 1.9°C | 69 mm | 87% | 5.3 m/s | 2.9 |
| 2003 | 10.2°C | 8.2°C | 6.1°C | 13.0°C | 3.7°C | 52 mm | 88% | 5 m/s | 3.1 |
| 2002 | 9.9°C | 8.3°C | 6.7°C | 12.2°C | 2.7°C | 65 mm | 89% | 5.2 m/s | 2.6 |
| 2001 | 7.8°C | 6.5°C | 5.1°C | 11.0°C | 1.1°C | 123 mm | 89% | 5.3 m/s | 2.5 |
| 2000 | 9.5°C | 7.8°C | 6.2°C | 12.0°C | 3.4°C | 38 mm | 87% | 4.7 m/s | 3 |
| 1999 | 9.1°C | 7.7°C | 6.2°C | 12.4°C | 2.8°C | 66 mm | 89% | 5.1 m/s | 2.8 |
| 1998 🔥 | 10.1°C | 8.7°C | 7.3°C | 12.8°C | 5.4°C | 122 mm | 89% | 5.3 m/s | 2.4 |
| 1997 | 10.1°C | 8.4°C | 6.7°C | 12.8°C | 4.1°C | 42 mm | 90% | 4.6 m/s | 2.9 |
| 1996 | 8.0°C | 6.1°C | 4.2°C | 13.2°C | 1.6°C | 78 mm | 87% | 5 m/s | 2.2 |
| 1995 | 8.3°C | 6.6°C | 5.0°C | 11.1°C | 2.4°C | 77 mm | 84% | 6.1 m/s | 2.6 |
| 1994 | 9.2°C | 7.9°C | 6.6°C | 10.9°C | 4.0°C | 123 mm | 88% | 6.7 m/s | 2.5 |
| 1993 | 8.8°C | 7.2°C | 5.5°C | 12.0°C | 1.7°C | 34 mm | 87% | 4.8 m/s | 2.4 |
| 1992 | 9.1°C | 7.7°C | 6.2°C | 10.6°C | 2.8°C | 68 mm | 88% | 6.2 m/s | 2.3 |
| 1991 | 9.8°C | 8.0°C | 6.2°C | 13.0°C | 3.2°C | 97 mm | 89% | 4.6 m/s | 2.4 |
| 1990 | 10.0°C | 8.5°C | 7.0°C | 13.2°C | 3.0°C | 24 mm | 86% | 5.6 m/s | 2.7 |
| 1989 | 9.7°C | 8.1°C | 6.5°C | 12.0°C | 3.3°C | 127 mm | 87% | 6.2 m/s | 2.4 |
| 1988 | 8.8°C | 7.4°C | 6.1°C | 10.3°C | 2.2°C | 118 mm | 89% | 6 m/s | 2.6 |
| 1987 | 7.5°C | 5.9°C | 4.4°C | 10.2°C | 0.7°C | 94 mm | 86% | 6 m/s | 2.6 |
| 1986 | 7.4°C | 5.7°C | 4.0°C | 9.4°C | -0.8°C | 89 mm | 89% | 5.8 m/s | 2.9 |
| 1985 | 7.5°C | 6.0°C | 4.5°C | 10.4°C | 0.9°C | 81 mm | 86% | 5.3 m/s | 2.8 |
| 1984 | 7.5°C | 5.8°C | 4.0°C | 11.0°C | 1.3°C | 43 mm | 85% | 4.5 m/s | 2.7 |
| 1983 | 8.1°C | 6.8°C | 5.5°C | 9.6°C | 2.8°C | 69 mm | 90% | 4.8 m/s | — |
| 1982 | 8.8°C | 7.0°C | 5.2°C | 11.8°C | 3.0°C | 136 mm | 86% | 5.8 m/s | — |
| 1981 🌧️ | 9.6°C | 8.3°C | 7.0°C | 11.9°C | 2.3°C | 180 mm | 90% | 6.3 m/s | — |
Actual recorded March data for each year, 1981–2025 — sourced from NASA POWER.
The average high in March is around 9°C with lows near 5.8°C (mean 7.4°C), based on 45 years of NASA POWER data.
March averages 87 mm of rainfall in Llanelli, about average for rainfall. The wettest on record was 180 mm in 1981.
The hottest March reached 15.3°C in 2012. The coldest dipped to -3.1°C in 2018.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average March temperatures have risen by about 1.4°C. Daytime highs moved from 8.3°C to 9.8°C and overnight lows from 5.2°C to 6.5°C over the same span.
March is one of the cooler months of the year in Llanelli and about average for rainfall, so plan for around 9°C daytime highs and 5.8°C at night.
Not quite — March is the 3rd coolest month in Llanelli, averaging 7.4°C.
For March in Llanelli, pack warm layers and a jacket for chilly mornings, with typical highs of 9°C and lows of 5.8°C. Bring an umbrella or light rain jacket too.
Relative humidity in March averages 87% — quite humid.
Average wind speed in March is 5.3 m/s. The windiest March on record averaged 6.7 m/s (1994).
The wettest March on record was 1981 with 180 mm. On average, March sees 87 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 March, 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 March specifically, along with year-by-year records and how the month has changed over the decades.
