Castlerock Weather in January

Castlerock in January sees low temperatures, with highs around 9°C (48°F) and overnight lows of 5°C (41°F). Rainfall is fairly high at around 122 mm (4.8 in) on average, so pack waterproofs just in case.

Rainfall in Castlerock in January

Expect around 23 days of rain based on historical data, with 122 mm (4.8 in) average. Expect frequent rainfall this month, and not just light drizzle. When it rains, it tends to come down hard.

Temperature in Castlerock in January

In January, expect low temperatures in Castlerock, with highs of 9°C (48°F) and lows of 5°C (41°F) at night. Temperatures remain on the cold side all day. A proper warm jacket is worth having, not just for evenings. 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 Castlerock in January

With limited sunshine this month, there are about 50 hours of sun. It's ideal for those who prefer a cooler, cloudier climate.

If you prefer dry days with pleasant temperatures, January may not be the ideal month to visit Castlerock. Our weather planner can help you explore destinations with more pleasant weather conditions.