Monthly weather forecast and climate
Swansea, United Kingdom

The average high-temperature, is 8°C (46.4°F), while the average low-temperature is 4°C (39.2°F). In Swansea, United Kingdom, during 20 rainfall days, 95.5mm (3.8") of precipitation is typically accumulated.
Weather in January »
With an average high-temperature of 7.8°C (46°F) and an average low-temperature of 3.6°C (38.5°F), February is the coldest month. In Swansea, United Kingdom, during February, the rain falls for 15 days and regularly aggregates up to 67mm (2.6") of precipitation.
Weather in February »
In Swansea, the average high-temperature is 9.5°C (49.1°F), and the average low-temperature is 4.8°C (40.6°F). In Swansea, during 18 rainfall days, 72.9mm (2.9") of precipitation is typically accumulated.
Weather in March »
In April, the average high-temperature is 11.9°C (53.4°F), and the average low-temperature is 6.3°C (43.3°F). April is the month with the least rainfall in Swansea.
Weather in April »
In May, in Swansea, the average high-temperature is 15°C (59°F), and the average low-temperature is 9.2°C (48.6°F). In Swansea, United Kingdom, during May, the rain falls for 15 days and regularly aggregates up to 62.8mm (2.5") of precipitation.
Weather in May »
In Swansea, the average high-temperature is 17.7°C (63.9°F), and the average low-temperature is 11.8°C (53.2°F). In June, the rain falls for 15 days.
Weather in June »
In Swansea, the average high-temperature is 19.6°C (67.3°F), and the average low-temperature is 13.9°C (57°F). In Swansea, United Kingdom, it is raining for 13 days, with typically 71.9mm (2.8") of accumulated precipitation.
Weather in July »
August is the warmest month, with an average high-temperature of 19.7°C (67.5°F) and an average low-temperature of 14°C (57.2°F). In Swansea, in August, it is raining for 16 days, with typically 83.9mm (3.3") of accumulated precipitation.
Weather in August »
In September, the average high-temperature is 17.8°C (64°F), and the average low-temperature is 12.4°C (54.3°F). In Swansea, during September, the rain falls for 16 days and regularly aggregates up to 77.4mm (3") of precipitation.
Weather in September »
In October, the average high-temperature is 14.4°C (57.9°F), and the average low-temperature is 9.9°C (49.8°F). The month with the most rainfall is October when the rain falls for 19 days and typically aggregates up to 123.1mm (4.8") of precipitation.
Weather in October »
The average high-temperature, is 11.1°C (52°F), while the average low-temperature is 6.9°C (44.4°F). In Swansea, during November, the rain falls for 20 days and regularly aggregates up to 112.1mm (4.4") of precipitation.
Weather in November »
The average high-temperature, in December, is 8.7°C (47.7°F), while the average low-temperature is 4.7°C (40.5°F). In Swansea, United Kingdom, during December, the rain falls for 20 days and regularly aggregates up to 110.3mm (4.3") of precipitation.
Weather in December »

How much does it rain in Swansea?

In Swansea, United Kingdom, during the entire year, the rain falls for 201 days and collects up to 999.2mm (39.3") of precipitation.

What is the month with the least sunshine in Swansea?

Months with the least sunshine in Swansea are January, November and December, with an average of 2h of sunshine.

What is the coldest month in Swansea?

The coldest month is February, with an average high-temperature of 7.8°C (46°F) and an average low-temperature of 3.6°C (38.5°F).

What is the month with the coldest sea water in Swansea?

March is the month with the coldest seawater in Swansea, with an average sea temperature of 8.3°C (46.9°F). Swimming in 8.3°C (46.9°F) is considered dangerous. Unprotected immersion in temperatures below 10°C (50°F) causes quickly maximum intensity cold shock with hyperventilation.

What is the driest month in Swansea?

April is the month with the least rainfall in Swansea. Rain falls for 14 days and accumulates 58.5mm (2.3") of precipitation.

What are the months with the most sunshine in Swansea?

Months with the most sunshine in Swansea are May and June, with an average of 7h of sunshine.

When are the longest days in Swansea?

With an average of 16.6h of daylight, June has the longest days of the year in Swansea.

What are the months with the highest UV index in Swansea?

June through August, with an average UV index of 6, are months with the highest UV index.

What is the warmest month in Swansea?

August is the warmest month, with an average high-temperature of 19.7°C (67.5°F) and an average low-temperature of 14°C (57.2°F).

When is the sea warmest in Swansea?

August is the month with the warmest seawater in Swansea, with an average sea temperature of 16.8°C (62.2°F). For most, swimming in 16.8°C (62.2°F) is not an enjoyable activity. Furthermore, controlling your breathing becomes progressively more difficult as the water temperature decreases from 21°C (69.8°F) to 15°C (59°F).

What is the wettest month in Swansea?

October is the month with the most rainfall in Swansea, United Kingdom. Rain falls for 19 days and accumulates 123.1mm (4.8") of precipitation.

What is the month with the shortest days in Swansea?

The month with the shortest days is December, with an average of 7.9h of daylight.

What is the month with the lowest UV index in Swansea?

With an average UV index of 0, December is the month with the lowest UV index in Swansea, United Kingdom.
Average temperature - Swansea, United Kingdom
Average rainfall - Swansea, United Kingdom

The wettest month (with the highest rainfall) is October (123.1mm).
The driest month (with the lowest rainfall) is April (58.5mm).

Average rainfall days - Swansea, United Kingdom

Months with the highest number of rainy days are January, November and December (20 days).
The month with the lowest number of rainy days is July (13 days).

Average sea temperature - Swansea, United Kingdom

The best month for swimming (with the highest average sea temperature) is August (16.8°C).
The coldest month (with the lowest average sea temperature) is March (8.3°C).

Average daylight / Average sunshine - Swansea, United Kingdom
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