December weather forecast
Swansea, United Kingdom

Concluding the calendar year, December in Swansea plunges into full-fledged winter. The high temperature drops further to an average of 8.7°C (47.7°F) as the cold weather takes a firm grip. Given the low UV index reading of zero units, winter wear becomes essential when venturing out. Holiday decorations light up the city, warming up the chilly December nights, and setting a festive tone to celebrate the end of the year.

Temperature

Swansea, United Kingdom, sees the arrival of December with an average high-temperature of a chilly 8.7°C (47.7°F), indicating a subtle variation from November. In Swansea, the month of December records an average minimum temperature of 4.7°C (40.5°F), a slight dip from the daily highs.

Rainfall

In December, the rain falls for 20 days. Throughout December, 110mm (4.33") of precipitation is accumulated. In Swansea, during the entire year, the rain falls for 201 days and collects up to 999mm (39.33") of precipitation.

Sea temperature

In December, the average sea temperature is 11.1°C (52°F).
Note: With the appropriate swimsuit, one can swim in 11.1°C (52°F) even if temperatures dip below 10°C (50°F); otherwise, be ready for cold shock and breath issues. A fleeting swim around 13°C (55.4°F) is distressing.

Daylight

December has the shortest days of the year in Swansea, with an average of 7h and 54min of daylight.
On the first day of December in Swansea, sunrise is at 8:00 am and sunset at 4:09 pm. On the last day of the month, sunrise is at 8:21 am and sunset at 4:16 pm GMT.

Sunshine

The months with the least sunshine are January, November and December, with an average of 2h of sunshine.

UV index

The month with the lowest UV index is December, with an average maximum UV index of 0. A UV Index reading of 2, and below, represents a low health risk from unsafe exposure to UV radiation for ordinary individuals.
Note: In December, a daily UV index of 0 turns into the following recommendations:
Most individuals can handle sun exposure for up to an hour without burning, but children must always be shielded from sun exposure. The Sun is most powerful around mid-day, so it's a good practice to reduce direct exposure. On sunny days, it's ideal to wear sunglasses that filter out UVA and UVB rays.