Killarney Weather in September
Killarney in September sees moderate temperatures, with highs around 17°C (63°F) and overnight lows of 10°C (50°F). It's the driest month of the year, with very little rainfall to worry about.
Rainfall in Killarney in September
Expect the least amount of rain this month, providing an excellent opportunity for outdoor activities. Enjoy the clearest skies and driest conditions of the year. Historically, September sees about 19 days of rain, with a monthly average of 93 mm (3.7 in). Rain falls on many days this month, but usually in relatively small amounts. A light waterproof is more useful than a heavy umbrella.
Temperature in Killarney in September
In September, Killarney gets moderate temperatures, with highs of 17°C (63°F). Nights cool to around 10°C (50°F). Conditions are often most pleasant around the middle of the day. With lows around 10°C (50°F), nights are cold. The upside is that cool, crisp nights are often the best for a deep sleep.
Sunshine in Killarney in September
The city usually sees around 118 hours of sunlight, indicating a moderately sunny period.If your ideal day consists of dry skies and pleasant temperatures, June typically offers the best circumstances for Killarney.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Ireland, check out our Killarney's climate page.
Killarney Temperature in September
Min Temperature
10°C (50°F)
Max Temperature
17°C (63°F)
Chance of Rain
64%
Precipitation
93 mm (3.7 in)
Rainy days
19 days
Humidity
77% *
Sunshine
118 hours *
Percentage Sunshine
30% *
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Killarney typically stay consistent throughout September, with daily highs averaging around 17°C (63°F). Nights are cool, with lows typically ranging from 10°C (50°F) to 12°C (54°F).
Average temperatures in September
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 September
Historical weather for Killarney in September
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 September
Based on 49 years of weather observations (1976-2025), these are the most extreme conditions recorded in Killarney.
- The hottest September day on record in Killarney reached 27°C (81°F) (September 7, 2021).
- On September 20, 2018, Killarney saw its coldest September day with temperatures maxing out at 11°C (52°F).
- The lowest overnight temperature recorded in September was 1°C (34°F) (September 22, 2025).
Best Places in Ireland in September
Find out more about the weather in Ireland and which places have the best travel conditions in this month. See all of Ireland in September →
perfect weather
pleasant
tolerable
unpleasant
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What to Wear in Killarney in September
Comfortable temperatures call for an easy wardrobe in September. Pack summer basics like t-shirts and shorts, but include a light jacket for cooler moments. A pair of comfortable walking shoes is essential. Expect heavy rainfall, so bring good rain protection and waterproof bags. Bring sunglasses since you'll have some sunny periods throughout the monthWhat To Do in Killarney in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Ireland, check out our Killarney's climate page.
Temperature Rainfall Sunshine Humidity
See the full Killarney climate overview or explore weather in Ireland.
