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Live forecasts update automatically; written guidance last reviewed 16 June 2026 by the StoryShift weather desk. Data from national met services via Open-Meteo.
Live data from Open-Meteo · updates automatically ·
Llanelli’s weather is shaped by its position on the Carmarthenshire coast, bringing mild winters, cool summers and frequent rain. Check the live forecast above for today’s conditions and the week ahead before making plans.
When is the best time to visit Llanelli?
The most settled weather typically arrives between late May and early September, when average highs reach about 19°C and sunshine hours are longest. July and August also coincide with school holidays, so expect more visitors at attractions such as the Millennium Coastal Park. For quieter conditions with still pleasant temperatures, consider June or early September.
What should you pack for Llanelli?
Waterproofs are essential year-round – Llanelli receives around 1,200mm of rain annually. A light jacket works for summer evenings, while a warm coat, hat and gloves are needed from November to February. In winter, coastal winds can make it feel colder, so layering is wise. Sunscreen and sunglasses are useful in summer, but the breeze often keeps temperatures comfortable.
Is Llanelli often windy?
Yes – coastal locations like Llanelli can be breezy, especially in autumn and winter. The prevailing south-westerly winds bring Atlantic weather systems, so gusts of 30–40 mph are not uncommon between October and March.
What is the sea temperature around Llanelli?
Sea temperatures peak at around 17°C in August, making swimming possible for the hardy. In winter they drop to about 8°C. The nearby beaches at Pembrey and Cefn Sidan are popular for walks even when the water is cool.
How reliable is the 14-day forecast for Llanelli?
As with most UK coastal areas, forecasts beyond 5–7 days are indicative. The Met Office and BBC weather services provide the most reliable outlook. For detailed wind and tide info, xc weather Llanelli is a good resource for sailors and surfers.
For a broader picture of conditions across the country, visit our UK weather hub or check the 10 day weather forecast UK. If you’re also planning trips nearby, compare with bbc weather cardiff and bbc weather swansea – both are useful for the region. For a longer view, the bbc weather llanelli 14 day forecast and 21 day weather llanelli can help with early planning. For wind and surf conditions, xc weather llanelli is a specialist option, while met office weather llanelli gives official data. And don’t forget to look up weather in llanelli tomorrow or weather in llanelli 10 days for short-term detail.