January is one of the cooler months of the year in Llanelli, with average highs near 8.1°C and lows around 5.6°C (mean 6.9°C). It is a relatively wet time of year, averaging 123 mm of rainfall and 88% relative humidity across the period.
January is one of the cooler months of the year in Llanelli. Across 45 years of records, the warmest January in Llanelli was 2007 — when the month averaged 8.7°C — while the coldest was 1987 at 3.5°C. Typical January days reach 8.1°C with nights near 5.6°C. The long-term trend is warming, about 0.2°C per decade.
January is a relatively wet time of year in Llanelli, averaging 123 mm of rainfall. The wettest January on record was 2016 with 228 mm, while the driest was 1997 at 15 mm.
Relative humidity in Llanelli during January averages 88%. The most humid January was 1982 at 92%, and the least humid was 1984 at 83%.
January receives about 0.8 kWh/m²/day of solar energy in Llanelli. The sunniest Januarys were 2010, 2023 and 2025, among others at 0.9 kWh/m²/day, and the cloudiest was 1987 at 0.6.
Average wind speed in Llanelli during January is 6.2 m/s. The windiest January was 1984 at 7.9 m/s, while the calmest was 2022 at 4.5 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 6.2°C | 6.8°C | 7.3°C | 6.8°C | 7.2°C | +1°C |
| Avg High | 7.5°C | 8.1°C | 8.5°C | 8.1°C | 8.5°C | +1°C |
| Avg Low | 4.9°C | 5.4°C | 6.1°C | 5.6°C | 6.0°C | +1.1°C |
| Avg Rain | 115 mm | 126 mm | 106 mm | 134 mm | 139 mm | +24 mm |
January temperatures in Llanelli have risen by about 0.9°C between 1981–1985 and 2021–2025.
January has ranged from a record low of -4.8°C (1987) to a record high of 12.2°C (2005).
Rainfall in January is a relatively wet time of year, averaging 123 mm, with a wettest year of 228 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, January — with days averaging 8.1°C and nights around 5.6°C (mean 6.9°C) and higher rainfall (123 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 | 8.2°C | 6.8°C | 5.5°C | 11.8°C | 2.5°C | 147 mm | 87% | 5.4 m/s | 0.9 |
| 2024 | 8.3°C | 7.1°C | 5.9°C | 11.8°C | 2.2°C | 118 mm | 85% | 5.9 m/s | 0.8 |
| 2023 | 8.8°C | 7.6°C | 6.4°C | 11.8°C | 3.0°C | 155 mm | 85% | 6 m/s | 0.9 |
| 2022 | 8.8°C | 7.5°C | 6.2°C | 12.0°C | 4.3°C | 65 mm | 87% | 4.5 m/s | 0.8 |
| 2021 | 7.3°C | 6.2°C | 5.1°C | 10.8°C | 2.0°C | 207 mm | 89% | 5.8 m/s | 0.8 |
| 2020 | 9.3°C | 8.1°C | 7.0°C | 12.2°C | 4.2°C | 142 mm | 88% | 5.6 m/s | 0.8 |
| 2019 | 8.0°C | 6.9°C | 5.9°C | 10.4°C | 2.0°C | 83 mm | 86% | 4.9 m/s | 0.7 |
| 2018 | 9.0°C | 7.5°C | 6.0°C | 12.1°C | 2.7°C | 180 mm | 88% | 7 m/s | 0.8 |
| 2017 | 8.2°C | 7.0°C | 5.8°C | 10.6°C | 2.2°C | 105 mm | 88% | 5.2 m/s | 0.7 |
| 2016 🌧️ | 9.2°C | 8.1°C | 7.0°C | 11.8°C | 3.1°C | 228 mm | 87% | 6.9 m/s | 0.7 |
| 2015 | 8.8°C | 7.3°C | 5.8°C | 12.1°C | 2.9°C | 182 mm | 84% | 7 m/s | 0.8 |
| 2014 | 9.1°C | 7.8°C | 6.5°C | 11.1°C | 3.4°C | 149 mm | 87% | 6.4 m/s | 0.7 |
| 2013 | 7.6°C | 6.5°C | 5.4°C | 10.9°C | 0.6°C | 125 mm | 89% | 5.9 m/s | 0.7 |
| 2012 | 8.8°C | 7.6°C | 6.5°C | 11.6°C | 2.1°C | 101 mm | 88% | 6.4 m/s | 0.8 |
| 2011 | 6.7°C | 5.3°C | 4.0°C | 10.0°C | 0.1°C | 108 mm | 88% | 5 m/s | 0.8 |
| 2010 | 5.6°C | 4.3°C | 3.1°C | 9.2°C | -0.1°C | 76 mm | 89% | 5.2 m/s | 0.9 |
| 2009 | 7.1°C | 5.9°C | 4.7°C | 10.1°C | -0.1°C | 149 mm | 87% | 5.8 m/s | 0.8 |
| 2008 | 9.5°C | 8.3°C | 7.1°C | 11.3°C | 2.2°C | 153 mm | 87% | 7.2 m/s | 0.7 |
| 2007 🔥 | 9.8°C | 8.7°C | 7.6°C | 12.2°C | 2.7°C | 120 mm | 86% | 7.5 m/s | 0.8 |
| 2006 | 7.7°C | 6.5°C | 5.3°C | 10.5°C | 1.8°C | 49 mm | 89% | 5.5 m/s | 0.8 |
| 2005 | 9.5°C | 8.2°C | 6.9°C | 12.2°C | 3.6°C | 70 mm | 86% | 7.4 m/s | 0.7 |
| 2004 | 9.1°C | 7.9°C | 6.8°C | 11.3°C | 2.3°C | 146 mm | 86% | 6.4 m/s | 0.7 |
| 2003 | 7.8°C | 6.7°C | 5.6°C | 11.7°C | 1.0°C | 97 mm | 87% | 6.6 m/s | 0.9 |
| 2002 | 9.3°C | 8.0°C | 6.8°C | 11.6°C | 2.8°C | 123 mm | 90% | 6.4 m/s | 0.7 |
| 2001 | 7.1°C | 6.0°C | 4.9°C | 10.9°C | 1.7°C | 96 mm | 89% | 5.7 m/s | 0.9 |
| 2000 | 8.0°C | 6.8°C | 5.7°C | 11.2°C | 2.8°C | 56 mm | 88% | 5.6 m/s | 0.8 |
| 1999 | 9.3°C | 7.9°C | 6.6°C | 11.7°C | 2.2°C | 160 mm | 88% | 6.4 m/s | 0.7 |
| 1998 | 8.7°C | 7.3°C | 5.8°C | 12.1°C | 1.6°C | 144 mm | 87% | 7.1 m/s | 0.7 |
| 1997 | 5.2°C | 3.9°C | 2.7°C | 8.8°C | -1.4°C | 15 mm | 92% | 5.1 m/s | 0.7 |
| 1996 | 7.5°C | 6.4°C | 5.2°C | 10.8°C | -1.3°C | 124 mm | 91% | 7 m/s | 0.7 |
| 1995 | 9.1°C | 7.5°C | 5.8°C | 11.2°C | 2.2°C | 179 mm | 87% | 7.3 m/s | 0.7 |
| 1994 | 8.4°C | 7.2°C | 6.0°C | 10.6°C | 3.0°C | 147 mm | 88% | 6.6 m/s | 0.8 |
| 1993 | 9.1°C | 7.7°C | 6.2°C | 11.3°C | 2.6°C | 141 mm | 88% | 6.9 m/s | 0.7 |
| 1992 | 7.1°C | 5.8°C | 4.5°C | 10.8°C | 0.7°C | 44 mm | 89% | 4.9 m/s | 0.9 |
| 1991 | 6.8°C | 5.5°C | 4.2°C | 11.6°C | 0.2°C | 132 mm | 85% | 6.1 m/s | 0.8 |
| 1990 | 9.8°C | 8.5°C | 7.3°C | 11.5°C | 4.3°C | 171 mm | 88% | 7 m/s | 0.8 |
| 1989 | 9.5°C | 8.3°C | 7.0°C | 11.9°C | 4.8°C | 63 mm | 86% | 5.6 m/s | 0.9 |
| 1988 | 8.6°C | 7.4°C | 6.2°C | 11.7°C | 4.0°C | 190 mm | 88% | 6.7 m/s | 0.8 |
| 1987 ❄️ | 4.9°C | 3.5°C | 2.1°C | 11.0°C | -4.8°C | 37 mm | 87% | 5.7 m/s | 0.6 |
| 1986 | 7.7°C | 6.5°C | 5.3°C | 10.9°C | 2.6°C | 131 mm | 85% | 7.1 m/s | 0.8 |
| 1985 | 5.0°C | 3.6°C | 2.3°C | 9.7°C | -2.1°C | 101 mm | 87% | 5.3 m/s | 0.8 |
| 1984 | 8.0°C | 6.4°C | 4.9°C | 11.9°C | 0.6°C | 179 mm | 83% | 7.9 m/s | 0.7 |
| 1983 | 9.2°C | 7.9°C | 6.7°C | 11.7°C | 2.6°C | 133 mm | 88% | 7.5 m/s | — |
| 1982 | 6.6°C | 5.4°C | 4.3°C | 10.9°C | -2.2°C | 143 mm | 92% | 6.2 m/s | — |
| 1981 | 8.4°C | 7.1°C | 5.7°C | 10.5°C | 2.2°C | 58 mm | 87% | 5.9 m/s | — |
Actual recorded January data for each year, 1981–2025 — sourced from NASA POWER.
The average high in January is around 8.1°C with lows near 5.6°C (mean 6.9°C), based on 45 years of NASA POWER data.
January averages 123 mm of rainfall in Llanelli, a relatively wet time of year. The wettest on record was 228 mm in 2016.
The hottest January reached 12.2°C in 2005. The coldest dipped to -4.8°C in 1987.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average January temperatures have risen by about 0.9°C. Daytime highs moved from 7.4°C to 8.3°C and overnight lows from 4.8°C to 5.8°C over the same span.
January is one of the cooler months of the year in Llanelli and a relatively wet time of year, so plan for around 8.1°C daytime highs and 5.6°C at night.
Not quite — January is the 2nd coolest month in Llanelli, averaging 6.9°C.
For January in Llanelli, pack warm layers and a jacket for chilly mornings, with typical highs of 8.1°C and lows of 5.6°C. Bring an umbrella or light rain jacket too.
Relative humidity in January averages 88% — quite humid.
Average wind speed in January is 6.2 m/s. The windiest January on record averaged 7.9 m/s (1984).
The wettest January on record was 2016 with 228 mm. On average, January sees 123 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 January, 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 January specifically, along with year-by-year records and how the month has changed over the decades.
