Swansea, Wales Weather by Month and Climate Averages

How much rain does Swansea get?

Swansea gets 852 mm of precipitation in an average year, spread over about 181 days with measurable rain. That is fewer rainy days than 67% of the UK.

November is the wettest month, with 112 mm. May is the driest, with 49 mm. November has the most rainy days, about 19.

The longest dry spell in the last five years lasted 26 days, to June 10, 2023.

Swansea weather by month

Swansea weather in January

In January, Swansea averages a high of 8°C and a low of 2°C. It gets 80 mm of precipitation over about 17 rainy days. The sun is out about 30% of daylight hours. The January record high is 14°C (2022) and the record low is -13°C (2003).

Swansea weather in February

In February, Swansea averages a high of 8°C and a low of 2°C. It gets 61 mm of precipitation over about 15 rainy days. The sun is out about 26% of daylight hours. The February record high is 15°C (1990) and the record low is -12°C (2004).

Swansea weather in March

In March, Swansea averages a high of 9°C and a low of 3°C. It gets 52 mm of precipitation over about 15 rainy days. The sun is out about 33% of daylight hours. The March record high is 21°C (2012) and the record low is -9°C (2004).

Swansea weather in April

In April, Swansea averages a high of 12°C and a low of 4°C. It gets 52 mm of precipitation over about 13 rainy days. The sun is out about 39% of daylight hours. The April record high is 24°C (2003) and the record low is -7°C (2004).

Swansea weather in May

In May, Swansea averages a high of 14°C and a low of 7°C. It gets 49 mm of precipitation over about 13 rainy days. The sun is out about 38% of daylight hours. The May record high is 27°C (2012) and the record low is -7°C (1983).

Swansea weather in June

In June, Swansea averages a high of 16°C and a low of 9°C. It gets 59 mm of precipitation over about 12 rainy days. The sun is out about 38% of daylight hours. The June record high is 30°C (1973) and the record low is -2°C (2003).

Swansea weather in July

In July, Swansea averages a high of 18°C and a low of 12°C. It gets 60 mm of precipitation over about 13 rainy days. The sun is out about 35% of daylight hours. The July record high is 31°C (1976) and the record low is -1°C (2004). July is one of the most comfortable months to visit.

Swansea weather in August

In August, Swansea averages a high of 18°C and a low of 12°C. It gets 70 mm of precipitation over about 15 rainy days. The sun is out about 34% of daylight hours. The August record high is 32°C (1995) and the record low is -1°C (2005). August is one of the most comfortable months to visit.

Swansea weather in September

In September, Swansea averages a high of 17°C and a low of 9°C. It gets 60 mm of precipitation over about 14 rainy days. The sun is out about 32% of daylight hours. The September record high is 28°C (2023) and the record low is -4°C (2003).

Swansea weather in October

In October, Swansea averages a high of 14°C and a low of 6°C. It gets 96 mm of precipitation over about 17 rainy days. The sun is out about 24% of daylight hours. The October record high is 23°C (2011) and the record low is -8°C (2003).

Swansea weather in November

In November, Swansea averages a high of 11°C and a low of 5°C. It gets 112 mm of precipitation over about 19 rainy days. The sun is out about 26% of daylight hours. The November record high is 20°C (1975) and the record low is -6°C (2001).

Swansea weather in December

In December, Swansea averages a high of 8°C and a low of 3°C. It gets 100 mm of precipitation over about 18 rainy days. The sun is out about 24% of daylight hours. The December record high is 14°C (2015) and the record low is -6°C (2010).

Sunshine, humidity and wind in Swansea

April is the sunniest month in Swansea, with sunshine about 39% of daylight hours. October is the cloudiest, at 24%. Over the year the sun shines about 32% of daylight hours. Swansea is sunnier than 70% of the UK.

Humidity peaks in December at 84% and is lowest in April at 76%.

First and last freeze in Swansea

The first fall freeze in Swansea typically comes around November 30, and the last spring freeze around March 23. That leaves a frost-free growing season of about 252 days.

Swansea weather records

The hottest temperature on record at the Swansea station is 32°C, on August 2, 1995. The coldest is -13°C, on January 30, 2003.

The wettest day on record brought 105 mm of rain, on June 11, 1993.

35 all-time records have been set at the station since 1973.

The best time to visit Swansea

The most comfortable time to visit is typically July to August, when daytime highs sit near 18°C.

Winter (December–February) is chilly, with average highs around 8°C and lows near 3°C.

Spring (March–May) is chilly, with average highs around 12°C and lows near 5°C.

Summer (June–August) is mild, with average highs around 18°C and lows near 11°C. It can feel humid.

Autumn (September–November) is mild, with average highs around 14°C and lows near 7°C.

Swansea climate questions

How much rain does Swansea get?

Swansea gets 852 mm of precipitation in an average year, over about 181 rainy days.

What is the wettest month in Swansea?

November is the wettest month in Swansea, with 112 mm. May is the driest, with 49 mm.

How many rainy days does Swansea have a year?

Swansea has about 181 days with measurable rain in an average year. November has the most, about 19.

What is the hottest month in Swansea?

July is the warmest month in Swansea, with an average high of 18°C.

What is the coldest month in Swansea?

January is the coldest month in Swansea, with an average low of 2°C.

What is the record high temperature in Swansea?

The record high at the Swansea station is 32°C, set on August 2, 1995. The record low is -13°C, on January 30, 2003.

What is the sunniest month in Swansea?

April is the sunniest month in Swansea, with sunshine about 39% of daylight hours. October is the cloudiest.

When is the first frost in Swansea?

The first fall freeze in Swansea typically comes around November 30. The last spring freeze is around March 23.

What is the best time to visit Swansea?

The most comfortable time to visit is typically July to August, when daytime highs sit near 18°C.