Carmarthen

Planning your day in Carmarthen? Here you will find the most up-to-date weather information, including detailed forecasts and visual charts.

The climate in Carmarthen, located in the United Kingdom, can be described as temperate maritime. This means there are no extreme temperatures, and the weather can be quite changeable throughout the year. The city experiences neither sweltering heat nor severe frosts, making it comfortable to visit at any time, provided you are prepared for potential rainfall.

Carmarthen has four distinct seasons. Winters (December to February) are mild, with average temperatures around 5-7°C. Summers (June to August) are warm but not hot, with average temperatures around 14-16°C, and maximums rarely exceeding 19°C. Spring and autumn are transitional seasons with moderate temperatures.

A key feature of the weather in Carmarthen is the high probability of precipitation throughout the year. Although the total rainfall in millimeters is low (3-5 mm per month), the number of rainy days is significant—ranging from 14 to 19 days a month. This suggests that light rain or drizzle may be frequent companions on your trip, so it's worth bringing an umbrella or a raincoat regardless of the season.

Carmarthen experiences a temperate maritime climate with notable seasonal temperature changes. The annual temperature range is quite distinct, but without extremes. The coldest month is usually January, with an average temperature of about 5.6°C, where night lows can drop to 3.4°C and daytime highs rarely exceed 7.7°C. The warmest month is typically August, when the average temperature reaches 16.0°C, with daytime highs around 18.7°C and night lows around 13.3°C. July is also very warm, with an average temperature of 15.9°C.

Summer months in Carmarthen (June, July, August) are characterized by pleasantly warm weather. Average daytime temperatures range from 17.8°C in June to 19.0°C in July, creating comfortable conditions for walking and outdoor activities. Nights remain quite cool, with temperatures between 11.4°C and 13.3°C. Winter (December, January, February) here is mild and cool, but not freezing. Average temperatures stay above zero; for example, in January, the average minimum is 3.4°C and the average maximum is 7.7°C. Frosts do occur, but severe and prolonged cold spells are untypical.

Throughout the year, Carmarthen sees moderate temperature fluctuations between day and night. The difference between average daily maximum and minimum temperatures usually ranges from 4°C to 7°C. The greatest temperature range (about 7°C) occurs in May, while in December and January, this difference is minimal (about 3.6°C - 4.3°C). This means that even on warm summer days, evenings can be quite fresh, and in winter, daytime warming is not so significant.

Precipitation in Carmarthen is distributed fairly evenly throughout the year, and it is difficult to identify a distinct rainy or dry season. The total monthly rainfall is low, indicating that the region is characterized by frequent but not very intense rain or drizzle rather than heavy downpours.

Rain is a regular occurrence in Carmarthen. The number of days with precipitation varies from 14 in April and May to 19 days in October and December. This means the probability of rain is high in almost any month, with precipitation falling on average every two to three days, and sometimes more often. Given the moderate air temperatures even in winter, precipitation here falls primarily as rain.

The highest average rainfall, about 5 mm per month, is recorded in October and December. These same months lead in the number of rainy days—averaging 19 days. Slightly less precipitation, around 4 mm, falls in February, March, September, and November, with the number of rainy days ranging from 16 to 18. The "driest" months in terms of rainfall (about 3 mm) are January, April, May, June, July, and August, although even during these months rain occurs quite often, totaling 14 to 17 rainy days.

When planning a trip to Carmarthen, it's important to consider the changeable weather typical of Wales. Since rain is frequent throughout the year, a waterproof jacket or raincoat and a sturdy umbrella will be your faithful companions. Regardless of the season, opt for comfortable waterproof footwear for exploring the city and its surroundings. Layering is the best approach for Carmarthen, as it allows you to easily adapt to temperature changes throughout the day.

In the summer months (June-August), when average temperatures range from 15-19°C, you'll need lightweight clothes, but don't forget to pack a sweater or light jacket for evening walks or cooler, windy days. Sunscreen and sunglasses will also come in handy on clear days. In the colder months, from November to March, average temperatures hover around 5-9°C. During this time, you should bring a warm sweater, a fleece, a winter jacket, as well as a hat, scarf, and gloves, especially if you are sensitive to the cold and wind. In spring (April-May) and autumn (September-October), the weather can be very unpredictable, so a combination of layers, including a windbreaker or a mid-season jacket, will be the most practical solution.