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Best time to go

When is the best time to visit Llanelli?

Find the best time to travel to Llanelli, Wales, with month-by-month weather, temperatures and precipitation. Also compare the local tourist crowds and the activities to do on-site.

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Check your ideal travel criteria and find the best time to go to Llanelli according to your preferences.
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When is the best time to visit Llanelli?

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Llanelli : best time to go in brief
Best time to go

Best time to go to Llanelli

Our tips and advice for choosing the best time to travel to Llanelli.

The maximum temperature in Llanelli is on average 13°C over the year, with values generally ranging between 8°C in January and 18°C in July. Precipitation is fairly high, with about 1,576 mm per year. It ranges from 75 mm in April to 175 mm in December.

The climate is suitable for a trip to Llanelli in: May, June, July, August, September and October. Nevertheless, the months when the weather is really pleasant are June, July, August and September.

For swimming, the most favorable period for water temperature is August and September, with a water temperature above 16.1°C.

However, the best time to fully enjoy the beach and swimming is May, June, July and August.

For hiking and trekking, the best months are April, May, June and July.

In terms of crowd levels, the quietest periods are in November, while crowding is high in April, May, June, September, July and August.

Climate

Climate of Llanelli, Wales

Temperatures, rain, sunshine and humidity allow you to quickly read the climate month by month in Llanelli.

Climate charts in Llanelli

Temperatures

Average curve and range between monthly minima and maxima.
Average Min / max

Precipitation

Average monthly rainfall observed each month.
Average rainfall Days with significant precipitation (>5 mm) Days with precipitation

Average daily sunshine

Average sunshine hours per day by month.
Sunshine hours

Relative humidity

Average humidity observed over the months.
Average humidity

What is the climate type in Llanelli?

Llanelli has a oceanic climate, which is a type of temperate climate. More precisely, according to the Köppen-Geiger classification, it is a temperate oceanic climate (with warm summer) (Cfb).

Activities

What to do in Llanelli and the best time to go depending on your interests?

Identify the best times for each travel desire in Llanelli and the activities you wish to do there.

Activity calendar

Each dot indicates, month by month, whether conditions are more or less favorable in Llanelli.

Very favorable Potentially favorable Unfavourable
Activity Jan. Feb. Mar. Apr. May Jun. Jul. Aug. Sep. Oct. Nov. Dec.
Beach and swimming
Hiking and trekking
Nature and landscapes
Visitor numbers

Crowd levels and tourist seasons

Compare the busiest periods and the quieter months to plan your trip to Llanelli according to the atmosphere you seek.

Peak crowds
JulyAugust
High season
AprilMayJuneSeptember
Mid-season
JanuaryFebruaryMarchOctoberDecember
Quieter period
November
Crowds at a glance

How do visitor numbers change in Llanelli?

Visitor numbers in Llanelli vary significantly depending on the time of year. The choice of month can therefore really change the atmosphere of the trip: livelier in high season, more relaxed and quieter in low season.

The high season is concentrated mainly in April, May, June, July, August and September, with more visitors, a livelier atmosphere and often increased demand for accommodations.

To travel with fewer crowds, the months of January, February, March, October, November and December are generally the most interesting in terms of crowds.

Updated on 15/09/2026

Visitor index month by month

An index from 0 to 100 to visualize how visitor numbers vary over the year.
Average score
52/100
Nearby

Destinations near Llanelli

Compare cities and destinations near Llanelli to find an alternative travel time, plan the rest of your stay, or spot an alternative destination.

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Frequently asked questions

Best time to go to Llanelli: Frequently asked questions

Short answers to the questions we most often ask ourselves before booking.

The best weather conditions in Llanelli are concentrated over 4 months: June, July, August and September. It is during this period that the weather is considered good to ideal.

Regarding weather, the least favorable months in Llanelli are the following: January, February, March, April, November and December. Travel remains possible, but expect less pleasant conditions and a more flexible itinerary.

Precipitation is concentrated mainly in these months: January, August, October, November and December. The peak occurs in December, with about 175 mm of precipitation spread over approximately 12 wet days. Conversely, the driest month is April, with about 75 mm.

The hottest month in Llanelli is July, with an average of 18°C during the day and 15°C at night. The coolest is January, with 8°C during the day and 5°C at night.

Swimming is most pleasant when the water temperature exceeds 16°C, that is during these months: August and September. The peak is reached in August, with about 17°C on average.

The sun is at its most generous in June, with about 12.9 hours of sunshine per day. The darkest month is December, with 5.2 hours per day.

Visitor levels are significantly higher during these months: April, May, June, July, August and September. For a quieter trip, aim for January, February, March, October, November and December. Over the year, the average visitor index is 52/100.

We detail the month-by-month weather of 12 nearby destinations, including Swansea, Carmarthen and Porthcawl. Compare them to build a coherent itinerary: conditions can vary from one city to another, even over short distances.
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Temperatures are shown in degrees Celsius and precipitation in millimetres. Based on your country of connection, °F and inches may be more familiar to you.