September · Ireland
Best time to visit Killarney in September Weather, crowds & prices
Weather in Killarney in September
Average temperature 14°C, 129 mm of rain, about 5 days with 6+ hours of sunshine and 88% humidity — based on the five most recent complete years of ERA5 data (2021–2025).
September score
5.8/10
Ranked #6 of 12 months
- Avg temp
- 14°C
- Rainfall
- 129 mm
- Humidity
- 88%
- Days with 6h+ sun
- 5
- Crowd Density
- Moderate Crowds
- Average Expenses
- $$ · Moderate Cost ($$)
September in Killarney scores 5.8/10 for nature and wildlife travel - an above-average month (#6 of 12). Expect around 14°C, 129 mm of rain, and roughly 5 days with 6+ hours of sunshine this month.
Scenic hub on the Ring of Kerry with mountain lakes, Muckross House, and national park.
September in Killarney — middling scores, decent value
Temperatures hover around 14°C (56°F) — the kind of month where neither heat nor cold forces the schedule.
129 mm of rain signals a properly wet month, with only about 5 days with 6+ hours of sunshine to count on — build indoor options into the schedule.
That is 5.8/10 on the same scale — 6th of 12 months, versus 8.4/10 for the best month here.
Pack layers you can shed by midday plus one warm layer for the evening, a proper rain shell rather than an umbrella, footwear you can get muddy.
Expect mid-season pricing, and crowds are moderate.
If your dates are flexible, May is materially better in Killarney — 2.6 points higher on the same scale.
Frequently asked
- What is the weather like in Killarney in September?
- In September, Killarney averages 14°C, 129 mm of rain, and about 5 days with 6+ hours of sunshine. Its climate-comfort score is 5.8/10.
- Is September a good time to visit Killarney?
- September earns a 5.8/10 climate-comfort score. Use the year-round chart to weigh the weather against your budget and crowd preferences.
- How much does it rain in Killarney in September?
- Expect about 129 mm of rain in September. Average humidity is 88% and there are about 5 days with 6+ hours of sunshine.
Curated in Killarney
Tickets & experiences
Things to do in Killarney
Killarney, Ireland. Live activities and tours from GetYourGuide, matched to this destination.