Weather in Swansea

Planning your day in Swansea? Check out the latest weather data, detailed forecasts, and visual charts in this section.

The climate in Swansea, located in the United Kingdom, can be described as temperate maritime. This means that there are no temperature extremes here: winters are quite mild, and summers are warm but not hot. Throughout the year, the weather can be changeable, so it is always useful to be prepared for changes.

Swansea has four distinct seasons. Summer (June-August) is usually the warmest time of the year with average temperatures around 14-16°C; maximum values rarely exceed 19°C. Winter (December-February) is cool, with average temperatures hovering around 5-6°C. Spring and autumn are transitional seasons with gradual temperature changes. A characteristic feature of the weather in Swansea, according to the provided data, is the high number of days with precipitation throughout the year – from 14 to 20 days per month. However, the total amount of precipitation is low, which may indicate frequent but light rain or drizzle.

Thus, when planning a trip to Swansea, you should expect moderate weather with a high probability of rainfall in any season. The warmest months are July and August, while the coolest are January and February. October and December stand out as the months with the highest rainfall and number of rainy days, although light precipitation is possible all year round.

The weather in Swansea is characterized by a temperate maritime climate with noticeable seasonal temperature changes. Throughout the year, average temperatures range from cool winter values to pleasantly warm summer ones. The coldest months are usually January, with an average temperature of about 5.3°C (minimum 3.1°C, maximum 7.5°C), and February, where the average temperature is approximately 6.1°C. The warmest months are considered to be July (average temperature 16.1°C, maximum up to 19.2°C) and August (average temperature 16.0°C, maximum up to 18.7°C), offering comfortable conditions for walks and relaxation on the coast.

The summer months in Swansea, from June to August, treat residents and visitors to pleasantly warm weather. Daytime highs rarely reach exhausting heat, usually remaining within the 17-19°C range, which is ideal for outdoor activities. Nights also remain mild, with temperatures around 11-13°C. Winter, on the other hand, brings coolness, but severe frosts are not typical for Swansea. From December to February, average daytime temperatures hover around 7-9°C, while nighttime temperatures can drop to 3-5°C. Temperature fluctuations between day and night are most noticeable in the spring and early summer months; for example, in May, the difference between the average minimum (8.1°C) and maximum (15.3°C) temperature is about 7°C, while in winter this difference is smaller, usually about 4-5°C.

The transitional seasons, spring (March-May) and autumn (September-November), demonstrate a gradual change in temperatures. Spring sees a steady increase in daily averages: from 6.7°C in March to 11.7°C in May. In autumn, there is a smooth decrease: from 14.2°C in September to 8.3°C in November. These periods are characterized by moderate temperatures, which can be very comfortable for visiting the city, although one should be prepared for the changeable weather typical of the UK.

In the city of Swansea, precipitation is a frequent occurrence throughout the year, however, its intensity and frequency vary by season. The greatest amount of precipitation usually falls during the autumn-winter period. Thus, December is the wettest month with an average figure of 6 mm of precipitation, followed by October and November, with 5 mm each. On the other hand, a relatively dry period is observed from April to July, when the average monthly precipitation is about 3 mm.

The nature of precipitation in Swansea is primarily rain, as average temperatures even in winter remain above freezing, making snowfall unlikely. The frequency of rain is quite high: the number of "wet" days ranges from 14 in April and May to 20 days in October. This indicates that precipitation is most often moderate or drizzly, rather than in the form of heavy downpours. Therefore, when heading to Swansea, it is recommended to have an umbrella or raincoat with you at any time of the year, but especially in autumn and early winter.

When planning a trip to Swansea, it is important to consider the changeable weather characteristic of Wales. Regardless of the time of year, a key element of your wardrobe should be a waterproof and windproof jacket. The number of rainy days in Swansea is significant throughout the year, so an umbrella or raincoat will also be very handy. Comfortable walking shoes are another must-have, as you will surely want to explore the city and its picturesque surroundings. The principle of layering clothing will be your best friend, allowing you to easily adapt to temperature changes throughout the day.

In the cold months, from October to March, when average temperatures range from 5°C to 9°C, pack warm sweaters, fleece tops, a hat, a scarf, and gloves. Waterproof footwear will also be an advantage. From April to September, the weather becomes warmer, with average temperatures from 9°C to 16°C. During this period, you will need lighter layers of clothing, such as t-shirts, long-sleeved shirts, and light trousers or jeans. However, even in summer, evenings can be cool, and rain is a frequent occurrence, so a light jacket or jumper and waterproof clothing are still necessary.

Don't forget small items like sunscreen, especially in the summer months, as the sun can be deceptive even on cloudy days. An adapter for British power outlets will also be useful if you are travelling from another country. Overall, being prepared for various weather conditions, especially rain and wind, will make your stay in Swansea much more comfortable and enjoyable.