August is one of the warmer months of the year in Llanelli, with average highs near 18.1°C and lows around 14.8°C (mean 16.5°C). It is one of the drier months, averaging 86 mm of rainfall and 85% relative humidity across the period.
August is one of the warmer months of the year in Llanelli. Across 45 years of records, the warmest August in Llanelli was 1995 — when the month averaged 18.6°C — while the coldest was 1986 at 14.2°C. Typical August days reach 18.1°C with nights near 14.8°C. The long-term trend is warming, about 0.2°C per decade.
August is one of the drier months in Llanelli, averaging 86 mm of rainfall. The wettest August on record was 2015 with 167 mm, while the driest was 1995 at 12 mm.
Relative humidity in Llanelli during August averages 85%. The most humid August was 1997 at 88%, and the least humid was 1995 at 80%.
August receives about 4.6 kWh/m²/day of solar energy in Llanelli. The sunniest August was 1995 at 5.3 kWh/m²/day, and the cloudiest was 2008 at 3.7.
Average wind speed in Llanelli during August is 4.4 m/s. The windiest August was 1985 at 6.2 m/s, while the calmest were 1981 and 1984 at 3.2 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 16.0°C | 16.5°C | 16.5°C | 16.3°C | 17.2°C | +1.2°C |
| Avg High | 17.7°C | 18.3°C | 18.1°C | 17.8°C | 18.9°C | +1.2°C |
| Avg Low | 14.2°C | 14.7°C | 14.9°C | 14.8°C | 15.5°C | +1.3°C |
| Avg Rain | 72 mm | 81 mm | 81 mm | 109 mm | 82 mm | +9 mm |
August temperatures in Llanelli have risen by about 0.8°C between 1981–1985 and 2021–2025.
August has ranged from a record low of 10.5°C (1986) to a record high of 26.3°C (1990).
Rainfall in August is one of the drier months, averaging 86 mm, with a wettest year of 167 mm.
One of the best times to visit Llanelli
August is one of the best times to visit Llanelli. Expect days averaging 18.1°C and nights around 14.8°C (mean 16.5°C) — warmer than Llanelli's yearly average — with higher rainfall (86 mm), so conditions are generally comfortable for sightseeing and outdoor plans.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 19.7°C | 17.9°C | 16.1°C | 24.7°C | 14.6°C | 56 mm | 82% | 4.4 m/s | 4.8 |
| 2024 | 18.5°C | 16.9°C | 15.4°C | 22.4°C | 13.8°C | 71 mm | 85% | 5 m/s | 4.4 |
| 2023 | 18.2°C | 16.7°C | 15.2°C | 20.9°C | 13.7°C | 105 mm | 87% | 4.7 m/s | 4.4 |
| 2022 | 20.3°C | 18.2°C | 16.1°C | 25.5°C | 13.9°C | 42 mm | 81% | 3.7 m/s | 5.2 |
| 2021 | 18.1°C | 16.3°C | 14.6°C | 20.1°C | 13.3°C | 68 mm | 86% | 4.4 m/s | 4.5 |
| 2020 | 18.8°C | 17.2°C | 15.6°C | 25.0°C | 12.5°C | 149 mm | 86% | 4.5 m/s | 4.2 |
| 2019 | 18.5°C | 17.0°C | 15.6°C | 22.2°C | 13.5°C | 115 mm | 85% | 5.1 m/s | 4.8 |
| 2018 | 18.2°C | 16.8°C | 15.4°C | 21.5°C | 12.4°C | 104 mm | 84% | 4.3 m/s | 4.2 |
| 2017 | 17.5°C | 16.0°C | 14.6°C | 20.6°C | 13.1°C | 101 mm | 84% | 4.6 m/s | 4.5 |
| 2016 | 18.3°C | 16.7°C | 15.1°C | 21.1°C | 13.2°C | 107 mm | 86% | 4.7 m/s | 4.6 |
| 2015 🌧️ | 17.4°C | 15.9°C | 14.3°C | 19.5°C | 12.8°C | 167 mm | 84% | 4.5 m/s | 4.5 |
| 2014 | 17.2°C | 15.8°C | 14.4°C | 19.5°C | 12.2°C | 114 mm | 81% | 5.3 m/s | 4.9 |
| 2013 | 18.5°C | 16.9°C | 15.3°C | 21.1°C | 12.9°C | 92 mm | 85% | 4.3 m/s | 4.7 |
| 2012 | 17.8°C | 16.5°C | 15.1°C | 21.1°C | 12.6°C | 127 mm | 87% | 4.9 m/s | 4.3 |
| 2011 | 16.9°C | 15.5°C | 14.2°C | 18.5°C | 12.4°C | 74 mm | 83% | 4.3 m/s | 4.5 |
| 2010 | 17.6°C | 16.0°C | 14.5°C | 19.6°C | 12.2°C | 85 mm | 84% | 4.8 m/s | 4.6 |
| 2009 | 17.9°C | 16.5°C | 15.0°C | 20.0°C | 13.5°C | 75 mm | 86% | 5 m/s | 4.4 |
| 2008 | 17.4°C | 16.2°C | 15.1°C | 19.9°C | 13.2°C | 151 mm | 88% | 5.5 m/s | 3.7 |
| 2007 | 17.8°C | 16.0°C | 14.3°C | 19.9°C | 13.0°C | 78 mm | 85% | 4.8 m/s | 4.8 |
| 2006 | 17.7°C | 16.3°C | 14.8°C | 20.4°C | 13.6°C | 56 mm | 85% | 4.9 m/s | 4.7 |
| 2005 | 18.0°C | 16.1°C | 14.3°C | 20.6°C | 12.6°C | 58 mm | 85% | 4.1 m/s | 5 |
| 2004 | 18.4°C | 16.9°C | 15.3°C | 22.1°C | 13.0°C | 140 mm | 86% | 4.1 m/s | 4.7 |
| 2003 | 19.6°C | 17.5°C | 15.5°C | 23.6°C | 12.5°C | 28 mm | 84% | 3.3 m/s | 4.8 |
| 2002 | 17.7°C | 16.0°C | 14.2°C | 19.2°C | 13.1°C | 56 mm | 87% | 3.5 m/s | 4.5 |
| 2001 | 18.0°C | 16.4°C | 14.9°C | 21.1°C | 13.3°C | 94 mm | 86% | 4.1 m/s | 4.3 |
| 2000 | 18.2°C | 16.6°C | 15.1°C | 20.8°C | 13.4°C | 76 mm | 86% | 4 m/s | 4.4 |
| 1999 | 18.2°C | 16.6°C | 14.9°C | 20.6°C | 13.4°C | 122 mm | 86% | 3.8 m/s | 4.5 |
| 1998 | 17.7°C | 15.9°C | 14.1°C | 21.9°C | 12.4°C | 54 mm | 85% | 4.4 m/s | 4.9 |
| 1997 | 19.4°C | 17.8°C | 16.1°C | 22.6°C | 14.1°C | 153 mm | 88% | 3.6 m/s | 4 |
| 1996 | 17.6°C | 15.8°C | 14.0°C | 20.3°C | 12.6°C | 84 mm | 85% | 4.4 m/s | 4.5 |
| 1995 🔥 | 21.0°C | 18.6°C | 16.2°C | 24.8°C | 13.8°C | 12 mm | 80% | 3.5 m/s | 5.3 |
| 1994 | 17.4°C | 15.8°C | 14.1°C | 19.9°C | 12.2°C | 98 mm | 84% | 4.6 m/s | 4.4 |
| 1993 | 16.9°C | 15.2°C | 13.4°C | 18.9°C | 10.9°C | 46 mm | 83% | 4.1 m/s | 4.8 |
| 1992 | 17.1°C | 15.6°C | 14.2°C | 18.8°C | 11.6°C | 161 mm | 83% | 5.3 m/s | 4.3 |
| 1991 | 18.3°C | 16.3°C | 14.3°C | 21.5°C | 13.0°C | 31 mm | 86% | 3.8 m/s | 4.6 |
| 1990 | 19.2°C | 17.3°C | 15.5°C | 26.3°C | 13.3°C | 52 mm | 84% | 4.1 m/s | 4.6 |
| 1989 | 18.4°C | 16.7°C | 15.0°C | 20.2°C | 12.8°C | 56 mm | 82% | 4.8 m/s | 4.9 |
| 1988 | 16.7°C | 15.0°C | 13.3°C | 21.8°C | 11.8°C | 101 mm | 85% | 4.8 m/s | 4.4 |
| 1987 | 17.5°C | 15.9°C | 14.2°C | 20.7°C | 11.4°C | 40 mm | 85% | 3.9 m/s | 4.6 |
| 1986 ❄️ | 15.7°C | 14.2°C | 12.6°C | 17.8°C | 10.5°C | 127 mm | 82% | 4.7 m/s | 4.1 |
| 1985 | 16.1°C | 14.8°C | 13.5°C | 19.7°C | 11.6°C | 151 mm | 85% | 6.2 m/s | 4.3 |
| 1984 | 19.5°C | 17.5°C | 15.4°C | 23.2°C | 13.3°C | 46 mm | 83% | 3.2 m/s | 4.8 |
| 1983 | 19.5°C | 17.3°C | 15.0°C | 23.1°C | 12.3°C | 35 mm | 83% | 3.4 m/s | — |
| 1982 | 17.5°C | 15.9°C | 14.3°C | 21.5°C | 11.9°C | 72 mm | 84% | 5.1 m/s | — |
| 1981 | 18.7°C | 16.7°C | 14.7°C | 21.4°C | 12.8°C | 23 mm | 84% | 3.2 m/s | — |
Actual recorded August data for each year, 1981–2025 — sourced from NASA POWER.
The average high in August is around 18.1°C with lows near 14.8°C (mean 16.5°C), based on 45 years of NASA POWER data.
August averages 86 mm of rainfall in Llanelli, one of the drier months. The wettest on record was 167 mm in 2015.
The hottest August reached 26.3°C in 1990. The coldest dipped to 10.5°C in 1986.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average August temperatures have risen by about 0.8°C. Daytime highs moved from 18.3°C to 19°C and overnight lows from 14.6°C to 15.5°C over the same span.
August is one of the warmer months of the year in Llanelli and one of the drier months, so plan for around 18.1°C daytime highs and 14.8°C at night.
Not quite — August is the 12th coolest month in Llanelli, averaging 16.5°C.
For August in Llanelli, pack light layers you can adjust through the day, with typical highs of 18.1°C and lows of 14.8°C. Bring an umbrella or light rain jacket too.
Relative humidity in August averages 85% — quite humid.
Average wind speed in August is 4.4 m/s. The windiest August on record averaged 6.2 m/s (1985).
The wettest August on record was 2015 with 167 mm. On average, August sees 86 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 August, 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 August specifically, along with year-by-year records and how the month has changed over the decades.
