Monthly weather forecast and climate
Cardiff, United Kingdom

What is the coldest month in Cardiff?

With an average high-temperature of 8.3°C (46.9°F) and an average low-temperature of 2.3°C (36.1°F), January is the coldest month.

How many days does it rain in Cardiff?

Throughout the year, there are 148.8 rainfall days, and 1152.1mm (45.4") of precipitation is accumulated.

What month is the sea coldest in Cardiff?

With an average sea temperature of 8.7°C (47.7°F), March is the month with the coldest seawater. At temperatures below 10°C (50°F), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Even a short swim, without thermal protection, at temperatures around 13°C (55.4°F) is not comfortable.

What is the driest month in Cardiff?

The month with the least rainfall in Cardiff is June when the rain falls for 10.1 days and typically collects 66.6mm (2.6") of precipitation.

What is the warmest month in Cardiff?

With an average high-temperature of 21.7°C (71.1°F) and an average low-temperature of 13.1°C (55.6°F), July is the warmest month in Cardiff.

When is the sea warmest in Cardiff?

Months with the warmest seawater are August and September, with an average sea temperature of 16.6°C (61.9°F). For swimming, a surface water temperature of 16.6°C (61.9°F) is not enjoyable for the majority. It is not considered safe, as controlling breathing becomes progressively more difficult as water temperature decreases below 21°C (69.8°F).

What is the rainiest month in Cardiff?

The month with the most rainfall in Cardiff is October when the rain falls for 15.5 days and typically aggregates up to 133.5mm (5.3") of precipitation.
Average temperature - Cardiff, United Kingdom
Average rainfall - Cardiff, United Kingdom

The wettest month (with the highest rainfall) is October (133.5mm).
The driest month (with the lowest rainfall) is June (66.6mm).

Average rainfall days - Cardiff, United Kingdom

The month with the highest number of rainy days is January (15.7 days).
The month with the lowest number of rainy days is June (10.1 days).

Average sea temperature - Cardiff, United Kingdom

Best months for swimming (with the highest average sea temperature) are August and September (16.6°C).
The coldest month (with the lowest average sea temperature) is March (8.7°C).

Average daylight / Average sunshine - Cardiff, United Kingdom
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