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September Weather in Killumney, Ireland

Last updated: August 23, 2025

In September, the average temperature in Killumney, Ireland hovers around 14°C (57°F). Expect a range from a cool 5°C (41°F) to a warm 22°C (72°F). Be prepared for about 79 mm (3.1 in) of precipitation over 12 days, and enjoy the elevated humidity levels, averaging 85% throughout the month.

September Temperature in Killumney

In September in Killumney, the average temperature is 14°C (57°F). The maximum can reach 22°C (72°F) and the minimum can be as low as 5°C (41°F). It’s a pleasant time to visit, so pack accordingly to enjoy your trip!

September Weather in Killumney: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Killumney, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Killumney, September typically has an average temperature of 14°C (57°F), with highs reaching up to 22°C (72°F) and lows dropping to around 5°C (41°F).
JanFebMarAprMayJunJulAugSepOctNovDec454545485257616057524846
Data source: Temperature data for Killumney generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Killumney

In Killumney in September, the precipitation amount is 79 mm (3.1 in) over a period of 12 days.

September Precipitation Trends in Killumney

The chart displays monthly precipitation patterns in Killumney, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In Killumney, September typically receives around 79 mm (3.1 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec7212596788066649079119102125
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Killumney

In Killumney in September, humidity is 85%. With an average temperature of 14°C (57°F), this humidity feels like a thick blanket enveloping you, making travel feel heavy and sluggish.

September Average Humidity in Killumney

This chart illustrates the average monthly humidity levels in Killumney, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in Killumney is approximately 85%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec83%85%84%84%84%85%85%84%85%86%84%83%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Killumney

In Killumney in September, the maximum UV index reaches 5, which corresponds to a moderate Exposure Category. Under these conditions, the estimated time to burn is approximately 30 minutes. For more details, you can check the Hourly UV Index in Killumney.

Maximum UV Index Levels in Killumney for September

The chart shows the monthly maximum UV Index (UVI) for Killumney in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In September, the maximum UV index in Killumney typically reaches 5, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec124678875421
Data source: Killumney September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How September Weather in Killumney Compares to Other Months

Weather in Killumney varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Killumney, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Killumney, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather7°C (45°F)72 mm (2.8 inches)83%low
February Weather7°C (45°F)125 mm (4.9 inches)85%low
March Weather7°C (45°F)96 mm (3.8 inches)84%moderate
April Weather9°C (48°F)78 mm (3.1 inches)84%high
May Weather11°C (52°F)80 mm (3.2 inches)84%high
June Weather14°C (57°F)66 mm (2.6 inches)85%very high
July Weather16°C (61°F)64 mm (2.5 inches)85%very high
August Weather15°C (60°F)90 mm (3.5 inches)84%high
September Weather14°C (57°F)79 mm (3.1 inches)85%moderate
October Weather11°C (53°F)118 mm (4.7 inches)86%moderate
November Weather9°C (48°F)102 mm (4.0 inches)84%low
December Weather8°C (46°F)125 mm (4.9 inches)83%low

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