An Irish adventure like no other in Killarney National Park
Head down to the South West part of the country, County Kerry, to the small town of Killarney. If you want to experience what Ireland is really all about
Killarney Weather in January
Killarney in January sees low daytime temperatures of 9°C (48°F) and nighttime lows of 3°C (37°F). Rainfall is fairly high this month at around 122 mm (4.8 in), so pack a rain jacket to stay dry.
Rainfall in Killarney in January
Historically, the month has about 23 days of rain, averaging 122 mm (4.8 in) in total. This month brings frequent, heavy showers. Both the number of wet days and the rainfall totals are on the high side.
Temperature in Killarney in January
Daytime temperatures in Killarney reach 9°C (48°F) in January, dropping to 3°C (37°F) at night. The winter season is characteristic of January. Cold conditions persist throughout the day, so warm clothing is important from the moment you head outside. Nights drop to 3°C (37°F). Cold nights like these are actually great for sleeping well, as long as you have a warm enough duvet. During January, the city enjoys the most temperate climate of the year.
Sunshine in Killarney in January
The city usually sees around 44 hours of sunlight, indicating fewer sunny days.January in Killarney has its charm. However, if you're seeking pleasant, dry and sunny weather, our weather planner can help you explore other destinations in the world.
Killarney Temperature in January
Min Temperature
3°C (37°F)
Max Temperature
9°C (48°F)
Chance of Rain
77%
Precipitation
122 mm (4.8 in)
Rainy days
23 days
Humidity
78% *
Sunshine
44 hours *
Percentage Sunshine
19% *
* Data from: Valentia, Ireland (52 KM, 32 Miles).
Killarney Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Killarney - and find the best time to visit.
Daily Historical Temperatures
50-year average (1976-2026)
Based on our historical records, temperatures in Killarney typically stay consistent throughout January, with daily highs averaging around 9°C (48°F). Nights are cold, with lows around 4°C (39°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 Killarney in January
Browse day-by-day weather records for Killarney spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Killarney historical weather extremes in January
Based on 25 years of weather observations (2000-2025), these are the most extreme conditions recorded in Killarney.
- The hottest January day on record in Killarney reached 15°C (59°F) (January 25, 2024).
- Killarney experienced its chilliest January day on January 10, 2010, reaching only 1°C (34°F).
- The lowest overnight temperature recorded in January was -8°C (18°F) (January 18, 2024).
- The wettest day in January Killarney was on January 8, 2005 with 59 mm (2.3 in) of precipitation.
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
pleasant
tolerable
unpleasant
poor
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 Killarney in January
Dress warmly and in layers for your trip to Killarney in January. A good base layer system works wonders. Start with good thermal underwear, add something warm like a fleece sweater, then finish with a waterproof jacket on top. Expect heavy rainfall, so bring good rain protection and waterproof bags. With limited sunshine expected, sunglasses aren't a priority for packing.
What To Do in Killarney 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
Killarney 3-Day Forecast
More climate data for Killarney
Temperature Rainfall Sunshine Humidity
See the full Killarney 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) Bucket list
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An Irish adventure like no other in Killarney National Park
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