Castlereagh Weather in December

December in Castlereagh sees daytime temperatures around 10°C (50°F) and lows of 5°C (41°F) at night. With around 98 mm (3.9 in) of rainfall expected, it's worth packing a rain jacket.

Rainfall in Castlereagh in December

Rain is expected on roughly 19 days, totalling around 98 mm (3.9 in) for the month. The rainfall pattern this month is fairly balanced. Showers tend to be moderate rather than extreme.

Temperature in Castlereagh in December

In December, expect low temperatures in Castlereagh, with highs of 10°C (50°F) and lows of 5°C (41°F) at night. December is part of the winter season. Expect a cold feel throughout the day, not just in the mornings and evenings. Warm layers are essential. With lows around 5°C (41°F), nights are cold. The upside is that cool, crisp nights are often the best for a deep sleep.

Sunshine in Castlereagh in December

This month is characterized by fewer sunny days, with about 39 hours of sunshine. It's great for those who appreciate cooler, less sunny days.

Wind Speed in Castlereagh in December

December has wind speeds averaging 5 m/s (10 knots). You can expect gentle to moderate winds that move small trees and make flags wave steadily on typical days. Conditions typically range from light breezes to moderate winds.

Average water temperature in December

With water temperatures around 10°C (50°F), swimming isn't really an option for most visitors. The cold sets in quickly and a wetsuit won't fully solve it.

Our weather planner can help you find worldwide destinations with pleasant weather during this period. July and August typically offer the best weather for Castlereagh.

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• January
• February
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For a detailed overview over the year and the best time to visit the United Kingdom, check out our Castlereagh's climate page.

Castlereagh Temperature in December

Min Temperature 5°C (41°F)  

Max Temperature 10°C (50°F)  

Water Temperature 10°C (50°F) *  

Chance of Rain 65%  

Precipitation 98 mm (3.9 in)  

Rainy days 19 days  

Humidity 90% *  

Windspeed 5 m/s (10 knots) *  

Sunshine 39 hours *  

Percentage Sunshine 15% *  

* Data from: Belfast, Ireland (24 KM, 15 Miles).

What to Wear in Castlereagh in December

We recommend to layer up for chilly conditions in Castlereagh in December. You could start with thermal underwear or a good base layer to keep your core warm on the cooler days this month. Maybe also add a sweater or fleece, and top it off with a windproof jacket. High rain levels are expected, so pack waterproof gear and an umbrella or poncho. The water temperature sits at about 10°C (50°F), which is too chilly for most people to enjoy swimming. Leave the swimsuit at home unless you love cold water. You can probably leave your sunglasses at home, because sunny days are pretty rare this month.

What To Do in Castlereagh in December

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

4/10

Cycling

4/10

Walking

4/10

Camping

4/10

Outdoor sports

4/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit the United Kingdom, check out our Castlereagh's climate page.

More climate data for Castlereagh

Temperature Rainfall Sunshine Humidity Wind Speed Water Temp

See the full Castlereagh climate overview or explore weather in the United Kingdom.