Castlebar Weather in January
January in Castlebar brings low temperatures, with highs of 9°C (48°F) and nights dropping to 3°C (37°F). Rainfall is on the higher side this month, averaging around 118 mm (4.6 in), so keep a rain jacket handy.
Rainfall in Castlebar in January
Climate statistics over the past 30 years suggest around 24 days of rain, with 118 mm (4.6 in) average for the month. Rain falls regularly this month and can be quite heavy when it does. Showers can be substantial, so waterproof gear is a good idea.
Temperature in Castlebar in January
In January, expect low temperatures in Castlebar, with highs of 9°C (48°F) and lows of 3°C (37°F) at night. The winter season takes place during January. The days stay cool from start to finish. Layering up well will make outdoor time much more comfortable. With overnight lows of 3°C (37°F), nights are cold. The cold air does make for deep, comfortable sleep if you have enough blankets. The temperatures in January are typically the coolest of the year.
Sunshine in Castlebar in January
The city usually sees around 45 hours of sunlight, indicating fewer sunny days.If you prefer dry days with pleasant temperatures, January may not be the ideal month to visit Castlebar. Our weather planner can help you explore destinations with more pleasant weather conditions.
Castlebar Temperature in January
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Castlebar Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Castlebar - and find the best time to visit.
Daily Historical Temperatures
50-year average (1976-2026)
Based on our historical records, temperatures in Castlebar typically stay consistent throughout January, with daily highs averaging around 9°C (48°F). Nights are cold, with lows around 3°C (37°F).
Average temperatures in January
Daily Historical Precipitation
50-year average (1976-2026)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in January
Historical weather records for Castlebar in January
Browse day-by-day weather records for Castlebar spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Castlebar historical weather extremes in January
Based on 25 years of weather observations in Castlebar between 2000 and 2025, these are the recorded extremes.
- The warmest day in January was on January 26, 2003, with a maximum of 14°C (57°F).
- On January 8, 2010, Castlebar saw its coldest January day with temperatures maxing out at -1°C (30°F).
- Castlebar registered its coldest January night on January 9, 2010, with temperatures dropping to -8°C (18°F).
- The wettest January day on record brought 27 mm (1.1 in) of precipitation to Castlebar (January 31, 2004).
Best Places in Ireland in January
Find out more about the weather in Ireland and which places have the best travel conditions in this month. See all of Ireland in January →
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).
What to Wear in Castlebar in January
We recommend to layer up for chilly conditions in Castlebar in January. 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. You can probably leave your sunglasses at home, because sunny days are pretty rare this month.
What To Do in Castlebar in January
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Swimming4/10 -
Cycling4/10 -
Walking4/10 -
Camping3/10 -
Outdoor sports4/10
Castlebar 3-Day Forecast
Temperature Rainfall Sunshine Humidity
See the full Castlebar climate overview or explore weather in Ireland.
Popular in January
Where to go in January - average daytime high across popular destinations.
Doolin
10°C (50°F) Cork10°C (50°F) Westport9°C (48°F) Kilkenny
9°C (48°F) Kenmare9°C (48°F) Killarney9°C (48°F) Galway10°C (50°F) Dublin9°C (48°F) 
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