Cardiff
United Kingdom
Long-term weather forecast
Long-term weather forecast

January weather forecast and climate
Cardiff, United Kingdom

January, like December, is a frosty winter month in Cardiff, United Kingdom, with average temperature fluctuating between 8.3°C (46.9°F) and 2.3°C (36.1°F).

Temperature

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

Rainfall

In Cardiff, United Kingdom, it is raining for 15.7 days, with typically 121.6mm (4.8") of accumulated precipitation. In Cardiff, during the entire year, the rain falls for 148.8 days and collects up to 1152.1mm (45.4") of precipitation.

Sea temperature

In January, the average sea temperature in Cardiff is 9.3°C (48.7°F).
Note: Swimming in 9.3°C (48.7°F) is considered life-threatening. Even a few minutes in 13°C (55.4°F) water is uncomfortable, and swimming below 10°C (50°F) may cause total loss of breathing control and cold shock, depending on a person's physique.

Daylight

In January, the average length of the day is 8.5h.

Sunshine

The average sunshine in January is 1.8h.

UV index

The average daily maximum UV index in January is 1. A UV Index of 2, and less, symbolizes a low health risk from unprotected exposure to the Sun's UV rays for ordinary individuals.
Note: In January, the average maximum UV index of 1 translate into the following recommendations:
Most people can stay in the Sun for up to 1 hour without burning, apart from children that always must be protected from sun exposure. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.

What is the coldest month in Cardiff?

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

What is the temperature in January in Cardiff?

The average high-temperature, in January, in Cardiff, is 8.3°C (46.9°F), while the average low-temperature is 2.3°C (36.1°F).

How much does it rain in Cardiff in January?

In Cardiff, United Kingdom, in January, during 15.7 rainfall days, 121.6mm (4.8") of precipitation is typically accumulated.

How cold is the water in January in Cardiff?

In January, the average sea temperature is 9.3°C (48.7°F). Swimming in 9.3°C (48.7°F) is considered life-threatening. Even a few minutes in 13°C (55.4°F) water is uncomfortable, and swimming below 10°C (50°F) may cause total loss of breathing control and cold shock, depending on a person's physique.

What is the average length of the day in January in Cardiff?

In January, the average length of the day in Cardiff is 8.5h.

How long on average sun shines in January in Cardiff?

In Cardiff, the average sunshine in January is 1.8h.

What is the UV index reading in January in Cardiff?

In January, the average daily maximum UV index in Cardiff, United Kingdom, is 1. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from unsafe exposure to the Sun's UV rays.
Average temperature in January - Cardiff, United Kingdom
  • Average high temperature in January: 8.3°C

The warmest month (with the highest average high temperature) is July (21.7°C).
The month with the lowest average high temperature is January (8.3°C).

  • Average low temperature in January: 2.3°C

The month with the highest average low temperature is July (13.1°C).
The coldest month (with the lowest average low temperature) is February (2.1°C).

Average rainfall in January - Cardiff, United Kingdom
  • Average rainfall in January: 121.6mm

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 in January - Cardiff, United Kingdom
  • Average rainfall days in January: 15.7 days

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 in January - Cardiff, United Kingdom
  • Average sea temperature in January: 9.3°C

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 in January / Average sunshine in January - Cardiff, United Kingdom
  • Average daylight in January: 8.5h

The month with the longest days is June (Average daylight: 16.5h).
The month with shortest days is December (Average daylight: 7.9h).

  • Average sunshine in January: 1.8h

The month with most sunshine is July (Average sunshine: 6.4h).
The month with least sunshine is December (Average sunshine: 1.6h).

Average UV index in January - Cardiff, United Kingdom
  • Average UV index in January: 1

Months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is December (UV index 0).