Killarney weather in September
Temperature, rain and sunshine in September: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in September
Good
Best time to visit: June – September
What is the weather like in Killarney in September?
In September, Killarney is mild: daytime highs average 17 °C, and nights cool down to about 11 °C. The sun is scarce, with only about 4 hours a day. Rain is frequent, with about 14 rainy days and 84 mm in total. All in all, September is a good month for a holiday in Killarney.
September compared
How the weather changes from August to October. Tap a month to open it.
| AugustAug | SeptemberSep | OctoberOct | |
|---|---|---|---|
| Score | 61 | 61 | 36 |
| Day | 18° | 17° | 14° |
| Night | 13° | 11° | 9° |
| Sun | 5 h | 4 h | 3 h |
| Rain days | 16 | 14 | 16 |
More details for September
- Daylight
- 12 h 45 min07:11 – 19:56
- UV index
- 4 · moderateclear sky, noon (estimate)All months
- Muggy days
- 0 daysdew point 18 °C or moreAll months
- Wind
- 19 km/haverage daily peakAll months
- Cloud cover
- 78 %on averageAll months
- Hot days
- 0 days30 °C or more
- Time zone
- UTC+1Europe/Dublin
How the score comes together
- Temperatureweight 50 %97 %
- Sunshineweight 20 %15 %
- Few rainy daysweight 30 %31 %
Each factor is rated from 0 to 100 % and weighted for the travel style “Nature escape”.
What to pack in September
- Sunscreen
- A jumper for the evenings
- Rain jacket or umbrella
Killarney in September: quick answers
Is Killarney hot in September?
No. In September, Killarney is mild: daytime highs average 17 °C and nights drop to about 11 °C.
Does it rain much in Killarney in September?
Rain is frequent, with about 14 rainy days and 84 mm in total.
Killarney month by month
The whole year in KillarneyAll destinations: IrelandWhere to go in September
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences