Llanelli Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Llanelli.
Climate overview of Llanelli
Llanelli, Dyfed, United Kingdom, has a moderate seasonal temperature range, with August reaching 19°C (66°F) and January cooling to 9°C (48°F).
The city receives considerable rainfall, with around 1377 mm (54 in) annually. October is the wettest month. It has pleasant summers and cold winters. The most sunshine falls in July, with an average of 6.7 hours of daily sunshine.
Llanelli Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Llanelli - and find the best time to visit.
Monthly Temperature in Llanelli
In Llanelli, seasonal changes bring about a moderate variation in temperatures. Typically, average maximum daytime temperatures range from a pleasant 19°C (66°F) in August to a chilly 9°C (48°F) in the coolest month, January.
Nights vary from 14°C (57°F) in August to around 4°C (39°F) during the colder months.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Llanelli
Llanelli is known for its substantial rainfall, with annual precipitation reaching 1377 mm (54 in). Llanelli offers a pleasant mix of wetter and slightly drier months. The difference in precipitation between the wettest month October (152 mm (6 in)) and the driest month April (83 mm (3.3 in)) is not too significant. For more details, please visit our Llanelli Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Sunshine Hours in Llanelli
For those who appreciate different seasons, Llanelli serves as an ideal destination. Expect longer, more sun-filled days in July with an average of 6.7 hours of sunshine daily, and embrace the darker days in December, offering only 1.6 hours of daily sunlight.
Visit our detailed sunshine hours page for more information.
Monthly hours of sunshine
Daily hours of sunshine
Daily percentage of sunshine
Humidity in Llanelli by Month
The city experiences its highest humidity in January, reaching 89%. In June, the humidity drops to its lowest level at 73%. What does this mean? Read our detailed page on humidity levels for further details.
Relative humidity over the year
Best Time to Visit Llanelli
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
- Best overall: June and July
- Warmest weather: July, August and September
- Most sunshine: May, June and July
- Seasonal pattern: Pleasant summers and cold winters
Frequently asked questions about the climate in Llanelli
What is the best time to visit Llanelli?
June and July typically offer the most optimal weather in Llanelli. In contrast, January, February, November and December tend to have less optimal conditions. Llanelli has pleasant summers and cold winters.
What temperatures can I expect in Llanelli?
Daytime highs range from 9°C (48°F) in January to 19°C (66°F) in August. Nighttime lows range from 4°C (39°F) to 14°C (57°F).
How much rain does Llanelli get?
Annual rainfall is around 1377 mm (54 in). October is the wettest month with 152 mm (6 in), while April is the driest with 83 mm (3.3 in).
How sunny is Llanelli?
Llanelli receives around 1,573 hours of sunshine per year. July is the sunniest month with 202 hours, while December is the cloudiest with just 49 hours.
Llanelli 3-Day Forecast
Llanelli on the map
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