January weather forecastDublin, Ireland

Weather in January

The chill of winter grips Dublin in the month of January, making it one of the coldest times of the year. The low temperatures can reach 3.9°C (39°F), particularly during early morning and late-night hours. Although daylight is limited, city experiences a unique blend of winter charm. The crispness in the air gives way to skies that are often cloudy, making for a not uncommon scene of Dublin under overcast conditions. January marks the continuation of winter with temperatures struggling to exceed 10°C (50°F) and rainfall adding to the cold conditions.

Temperature

January is the month that records the lowest temperatures, with averages ranging from a high of 8.8°C (47.8°F) to a low of 3.9°C (39°F).

Rainfall

In January, in Dublin, the rain falls for 12 days. Throughout January, 63mm (2.48") of precipitation is accumulated. Throughout the year, there are 128 rainfall days, and 714mm (28.11") of precipitation is accumulated.

Sea temperature

In Dublin, the average seawater temperature in January is 9.6°C (49.3°F).
Note: It is risky to swim in 9.6°C (49.3°F). Temperatures beneath 10°C (50°F) induce rapid cold shock and hyperventilation.

Daylight

In Dublin, the average length of the day in January is 8h and 11min.
On the first day of the month, sunrise is at 8:40 am and sunset at 4:16 pm. On the last day of January, in Dublin, sunrise is at 8:11 am and sunset at 5:05 pm GMT.

Sunshine

In January, the average sunshine in Dublin is 1.9h.

UV index

January and December, with an average maximum UV index of 0, are months with the lowest UV index. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from unsafe exposure to UV radiation for the average person.
Note: The UV index of 0 during January translates into the following guidance:
While most individuals can withstand prolonged sun exposure, it is imperative that babies, children, and those with sensitive skin always be shielded. The Sun is most powerful around mid-day, so it's a good practice to reduce direct exposure. Boost your sun resistance with garments that are densely woven yet spacious.