Killarney Monthly Rainfall & Precipitation
This page shows both the average monthly rainfall and the number of rainy days in Killarney, Kerry, Ireland. These averages rely on historical data collected over 30 years, from 1990 to 2020. Let's explore the details to provide you with a complete overview.
Killarney has a notably wet climate with abundant precipitation, recording 1283 mm (51 in) of rain/snowfall per year.
Monthly Precipitation Levels
The average number of days each month with precipitation (> 0.2 mm (0.01 in))
Year-round, Killarney has a balanced climate with minimal variation in precipitation. The difference between the wettest month, December, with 128 mm (5 in), and the driest month, September, with 93 mm (3.7 in), is minimal.
December, the wettest month, has a maximum daytime temperature of 10°C (50°F). The city receives 40 hours of sunshine in this period. During the driest month September you can expect a temperature of 17°C (63°F). For more detailed insights into the city's temperatures, visit our Killarney Temperature page.
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in May
Explore Killarney's Historical Precipitation: 1976-2026
Browse day-by-day precipitation records for Killarney spanning 51 years. Select any month and year to see actual rainfall and snowfall recorded on each day.
Annual Rainfall in Ireland: City Comparison
The map below shows the annual precipitation across Ireland. You can also select the different months in case you are interested in a specific month.
heavy rainfall
high
moderate
low
almost none
Killarney vs World: Rainfall Compared
Killarney's average annual precipitation is 1283 mm (51 in). Let's compare this to some popular worldwide tourist destinations:
Boston, USA, experiences 1238 mm (49 in) of annual precipitation, including significant snowfall during the winter.
Osaka, Japan, experiences 1507 mm (59 in) of rainfall annually, spread across the year with wetter summers.
In Brisbane, Australia, the annual precipitation is 979 mm (39 in), making it wetter than Sydney.
Kuala Lumpur, Malaysia, receives 2529 mm (100 in) of annual rainfall, characteristic of its equatorial tropical rainforest climate, with consistent rainfall throughout the year and peak months during March and November.
Precipitation amounts are measured using specific gauges installed at weather stations, collecting both rain and snow and any other type of precipitation. Rainfall is measured directly in millimeters, while that from snow and ice is obtained by melting it. Automated systems often incorporate heaters to make this easier.
Information from these stations is transmitted via Wi-Fi, satellite, GPS, or telephone connections to central monitoring networks. This information is immediately updated and integrated into weather models and forecasts.
Precipitation has a very strong role in determining the local climate and ecosystem:
- Changing Rainfall Patterns: Global warming causes drastic changes in the patterns of rainfall. Some areas have been experiencing increased frequency and intensity of rainfall, while other areas experience longer dry spells or even droughts.
- Local Impacts: Many regions are experiencing heavier rainfall in the winter months and drier, hotter summers. This affects agriculture, water resources, and ecosystems.
- Mawsynram in India is noted as being the wettest place on earth, with over 11 meters (36 feet) of rain falling every year.
- In contrast, Antofagasta in Chile is among the driest places on the planet, getting less than 0.1mm (0.004 inches) per year, with some years recording virtually no rainfall.
- Nearly 1,650 thunderstorm cells are estimated over the planet at any given time.
For more detailed information about Killarney's weather, including sunshine hours, humidity levels, and temperature data, visit our Killarney Climate page.
