Portstewart weather in January 2026

Q: How cold is it in Portstewart in January?

Daytime temperatures usually reach 7°C in Portstewart in January, falling to 1°C at night.

Q: How sunny is it in Portstewart in January?

There are normally 1 hour of bright sunshine each day in Portstewart in January - that's 15% of daylight hours.

Q: Is the sea cold around Portstewart in January?

The average sea temperature around Portstewart in January is 9°C.

Q: Does it rain in Portstewart in January?

There are usually 22 days with some rain in Portstewart in January and the average monthly rainfall is 118mm.

Expect daytime maximum temperatures of 45°F in Portstewart, Northern Ireland in January based on long-term weather averages. There is 1 hour of sunshine per day on average with 22 days with some rainfall and typically 4.6 inches of rainfall in the month.

45
45°F max day temperature
1
1 hour of sunshine per day
22
22 days with some rainfall
34
34°F min night temperature
8
8 hours of daylight per day
0
No heat & humidity
4.6
4.6 inches of monthly rainfall
0
No UV (Maximum) Index UV index
48
48°F sea temperature

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The January weather guide for Northern Ireland (Portstewart) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Metric (°C) | Imperial (°F)

More about the UK

How cold is it in Portstewart in January?

Daytime temperatures usually reach 45°F in Portstewart in January, falling to 34°F at night.

How sunny is it in Portstewart in January?

There are normally 1 hour of bright sunshine each day in Portstewart in January - that's 15% of daylight hours.

How warm is the sea around Portstewart in January?

The average sea temperature around Portstewart in January is 48°F.

Does it rain in Portstewart in January?

There are usually 22 days with some rain in Portstewart in January and the average monthly rainfall is 4.6 inches.

Portstewart January sunrise & sunset times

Browse the sunrise and sunset times for Portstewart in January 2026. Select a month to view Portstewart sunrise and sunset times for the next 12 months.

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