June is one of the warmer months of the year in Llanelli, with average highs near 16°C and lows around 12.2°C (mean 14.1°C). It is one of the drier months, averaging 74 mm of rainfall and 85% relative humidity across the period.
June is one of the warmer months of the year in Llanelli. Across 45 years of records, the warmest June in Llanelli was 2023 — when the month averaged 16.4°C — while the coldest was 1991 at 12.4°C. Typical June days reach 16°C with nights near 12.2°C. The long-term trend is warming, about 0.4°C per decade.
June is one of the drier months in Llanelli, averaging 74 mm of rainfall. The wettest June on record was 2012 with 161 mm, while the driest was 1995 at 21 mm.
Relative humidity in Llanelli during June averages 85%. The most humid June was 2016 at 87%, and the least humid was 1989 at 81%.
June receives about 5.8 kWh/m²/day of solar energy in Llanelli. The sunniest June was 2010 at 6.8 kWh/m²/day, and the cloudiest was 1997 at 4.6.
Average wind speed in Llanelli during June is 4 m/s. The windiest June was 1998 at 5.2 m/s, while the calmest were 2006 and 2010 at 2.9 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 13.6°C | 13.6°C | 14.3°C | 14.3°C | 15.0°C | +1.4°C |
| Avg High | 15.6°C | 15.5°C | 16.1°C | 16.2°C | 16.9°C | +1.3°C |
| Avg Low | 11.7°C | 11.7°C | 12.5°C | 12.5°C | 13.0°C | +1.3°C |
| Avg Rain | 67 mm | 75 mm | 63 mm | 87 mm | 79 mm | +12 mm |
June temperatures in Llanelli have risen by about 1.4°C between 1981–1985 and 2021–2025.
June has ranged from a record low of 7.4°C (1989) to a record high of 24.1°C (2017).
Rainfall in June is one of the drier months, averaging 74 mm, with a wettest year of 161 mm.
One of the best times to visit Llanelli
June is one of the best times to visit Llanelli. Expect days averaging 16°C and nights around 12.2°C (mean 14.1°C) — warmer than Llanelli's yearly average — with moderate rainfall (74 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 | 17.2°C | 15.6°C | 14.0°C | 22.0°C | 11.1°C | 119 mm | 87% | 4.3 m/s | 5.7 |
| 2024 | 15.7°C | 14.0°C | 12.3°C | 20.0°C | 10.2°C | 36 mm | 83% | 4 m/s | 6.1 |
| 2023 🔥 | 18.7°C | 16.4°C | 14.1°C | 22.5°C | 10.1°C | 39 mm | 84% | 3.3 m/s | 6.4 |
| 2022 | 16.7°C | 14.7°C | 12.7°C | 21.2°C | 10.6°C | 86 mm | 82% | 4.1 m/s | 6.1 |
| 2021 | 16.6°C | 14.5°C | 12.5°C | 20.2°C | 10.8°C | 39 mm | 86% | 3.3 m/s | 5.7 |
| 2020 | 16.6°C | 14.6°C | 12.6°C | 23.6°C | 8.7°C | 153 mm | 84% | 4.4 m/s | 5.2 |
| 2019 | 15.6°C | 13.9°C | 12.2°C | 20.0°C | 9.4°C | 132 mm | 85% | 4.4 m/s | 5.6 |
| 2018 | 18.1°C | 15.7°C | 13.4°C | 23.2°C | 10.8°C | 26 mm | 83% | 3.3 m/s | 6.4 |
| 2017 | 16.7°C | 15.0°C | 13.3°C | 24.1°C | 11.0°C | 119 mm | 86% | 4.8 m/s | 5.4 |
| 2016 | 16.5°C | 14.8°C | 13.1°C | 19.5°C | 10.0°C | 110 mm | 87% | 3.6 m/s | 5.5 |
| 2015 | 15.5°C | 13.6°C | 11.8°C | 21.0°C | 8.8°C | 76 mm | 84% | 4.5 m/s | 6.4 |
| 2014 | 17.0°C | 15.0°C | 13.0°C | 19.6°C | 10.7°C | 53 mm | 83% | 3.2 m/s | 6.7 |
| 2013 | 15.3°C | 13.4°C | 11.5°C | 17.6°C | 9.3°C | 50 mm | 85% | 4.5 m/s | 5.9 |
| 2012 🌧️ | 15.0°C | 13.5°C | 12.1°C | 17.9°C | 8.6°C | 161 mm | 87% | 5 m/s | 5 |
| 2011 | 15.1°C | 13.5°C | 11.9°C | 20.2°C | 9.5°C | 98 mm | 84% | 4.7 m/s | 6.1 |
| 2010 | 16.7°C | 14.6°C | 12.5°C | 18.9°C | 10.4°C | 41 mm | 85% | 2.9 m/s | 6.8 |
| 2009 | 16.7°C | 14.7°C | 12.6°C | 21.2°C | 9.6°C | 75 mm | 84% | 3.1 m/s | 6.1 |
| 2008 | 15.5°C | 13.8°C | 12.0°C | 18.2°C | 10.0°C | 59 mm | 84% | 4.5 m/s | 6.2 |
| 2007 | 16.7°C | 14.9°C | 13.1°C | 21.0°C | 11.6°C | 109 mm | 86% | 3.7 m/s | 5.3 |
| 2006 | 17.0°C | 15.0°C | 12.9°C | 21.5°C | 9.0°C | 30 mm | 85% | 2.9 m/s | 6.3 |
| 2005 | 16.3°C | 14.5°C | 12.7°C | 19.7°C | 10.0°C | 78 mm | 87% | 3.7 m/s | 5.9 |
| 2004 | 16.0°C | 14.3°C | 12.7°C | 19.5°C | 10.5°C | 56 mm | 86% | 4.3 m/s | 6.2 |
| 2003 | 16.6°C | 14.7°C | 12.8°C | 19.6°C | 11.2°C | 69 mm | 85% | 4 m/s | 6 |
| 2002 | 14.5°C | 13.0°C | 11.6°C | 17.2°C | 9.9°C | 57 mm | 86% | 4.8 m/s | 5.4 |
| 2001 | 15.6°C | 13.7°C | 11.8°C | 21.3°C | 8.8°C | 34 mm | 84% | 3.7 m/s | 6.2 |
| 2000 | 15.7°C | 14.0°C | 12.3°C | 20.4°C | 10.5°C | 59 mm | 85% | 4 m/s | 5.3 |
| 1999 | 15.1°C | 13.4°C | 11.7°C | 19.2°C | 9.5°C | 83 mm | 84% | 3.8 m/s | 5.6 |
| 1998 | 15.2°C | 13.6°C | 12.1°C | 20.3°C | 9.1°C | 141 mm | 87% | 5.2 m/s | 5.2 |
| 1997 | 15.5°C | 13.6°C | 11.8°C | 17.9°C | 10.0°C | 119 mm | 84% | 5.1 m/s | 4.6 |
| 1996 | 15.7°C | 13.4°C | 11.2°C | 19.2°C | 9.1°C | 32 mm | 83% | 3.6 m/s | 5.9 |
| 1995 | 15.9°C | 13.7°C | 11.5°C | 23.9°C | 9.1°C | 21 mm | 84% | 4.1 m/s | 6.1 |
| 1994 | 15.0°C | 13.2°C | 11.5°C | 18.8°C | 9.1°C | 52 mm | 86% | 4.6 m/s | 5.8 |
| 1993 | 16.1°C | 14.1°C | 12.1°C | 19.9°C | 10.1°C | 113 mm | 86% | 3.6 m/s | 5.6 |
| 1992 | 17.4°C | 14.9°C | 12.4°C | 20.9°C | 10.1°C | 22 mm | 82% | 3.2 m/s | 5.6 |
| 1991 ❄️ | 14.0°C | 12.4°C | 10.9°C | 15.9°C | 8.5°C | 96 mm | 85% | 5 m/s | 5.5 |
| 1990 | 15.1°C | 13.4°C | 11.8°C | 17.2°C | 10.3°C | 74 mm | 84% | 4.6 m/s | 5.2 |
| 1989 | 16.3°C | 14.1°C | 11.8°C | 23.2°C | 7.4°C | 46 mm | 81% | 3.9 m/s | 5.9 |
| 1988 | 16.6°C | 14.4°C | 12.2°C | 20.0°C | 9.5°C | 45 mm | 84% | 3.5 m/s | 6 |
| 1987 | 14.2°C | 12.6°C | 11.0°C | 17.2°C | 8.3°C | 77 mm | 85% | 4.1 m/s | 5.2 |
| 1986 | 16.1°C | 13.8°C | 11.5°C | 22.3°C | 8.0°C | 77 mm | 85% | 3.9 m/s | 5.1 |
| 1985 | 14.5°C | 12.7°C | 10.9°C | 17.9°C | 8.3°C | 98 mm | 83% | 4.5 m/s | 5.4 |
| 1984 | 16.0°C | 13.8°C | 11.5°C | 22.1°C | 8.5°C | 23 mm | 84% | 3.4 m/s | 6.2 |
| 1983 | 15.4°C | 13.5°C | 11.5°C | 19.5°C | 8.7°C | 49 mm | 86% | 3.6 m/s | — |
| 1982 | 16.7°C | 14.8°C | 12.9°C | 20.7°C | 10.4°C | 130 mm | 84% | 3.4 m/s | — |
| 1981 | 14.7°C | 13.1°C | 11.6°C | 17.8°C | 10.0°C | 57 mm | 85% | 4.9 m/s | — |
Actual recorded June data for each year, 1981–2025 — sourced from NASA POWER.
The average high in June is around 16°C with lows near 12.2°C (mean 14.1°C), based on 45 years of NASA POWER data.
June averages 74 mm of rainfall in Llanelli, one of the drier months. The wettest on record was 161 mm in 2012.
The hottest June reached 24.1°C in 2017. The coldest dipped to 7.4°C in 1989.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average June temperatures have risen by about 1.4°C. Daytime highs moved from 15.5°C to 17°C and overnight lows from 11.7°C to 13.1°C over the same span.
June is one of the warmer months of the year in Llanelli and one of the drier months, so plan for around 16°C daytime highs and 12.2°C at night.
Not quite — June is the 9th coolest month in Llanelli, averaging 14.1°C.
For June in Llanelli, pack light layers you can adjust through the day, with typical highs of 16°C and lows of 12.2°C. Bring an umbrella or light rain jacket too.
Relative humidity in June averages 85% — quite humid.
Average wind speed in June is 4 m/s. The windiest June on record averaged 5.2 m/s (1998).
The wettest June on record was 2012 with 161 mm. On average, June sees 74 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 June, 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 June specifically, along with year-by-year records and how the month has changed over the decades.
