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September Weather in Kilmessan, Ireland

Last updated: August 23, 2025

In September, the average temperature in Kilmessan, Ireland is a pleasant 14°C (57°F). Expect cool evenings with a minimum temperature of 1°C (35°F), while daytime highs can reach up to 25°C (77°F). Be prepared for some rain, as the area receives an average precipitation of 66 mm (2.6 in) over 12 days. With an average humidity of 86%, you'll want to dress accordingly to stay comfortable in this damp atmosphere!

September Temperature in Kilmessan

In September in Kilmessan, the average temperature is 14°C (57°F). The maximum can reach 25°C (77°F), and the minimum can be as low as 1°C (35°F). This makes it an ideal time for travelers who enjoy mild weather and the chance to explore comfortably.

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

The chart illustrates September temperature patterns in Kilmessan, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Kilmessan, September typically has an average temperature of 14°C (57°F), with highs reaching up to 25°C (77°F) and lows dropping to around 1°C (35°F).
JanFebMarAprMayJunJulAugSepOctNovDec424345485358616056514643
Data source: Temperature data for Kilmessan 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 Kilmessan

In Kilmessan in September, the precipitation amount is 66 mm (2.6 in) over the course of 12 days.

September Precipitation Trends in Kilmessan

The chart displays monthly precipitation patterns in Kilmessan, 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 Kilmessan, September typically receives around 66 mm (2.6 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec517877456572689466748085
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Kilmessan

In Kilmessan in September humidity is 86%. With an average temperature of 14°C (57°F), this humidity feels like a heavy blanket enveloping you, making travel feel oppressive and uncomfortably sticky.

September Average Humidity in Kilmessan

This chart illustrates the average monthly humidity levels in Kilmessan, 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 Kilmessan is approximately 86%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%86%86%85%83%85%86%85%86%87%87%84%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Kilmessan

In Kilmessan 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 Kilmessan.

Maximum UV Index Levels in Kilmessan for September

The chart shows the monthly maximum UV Index (UVI) for Kilmessan 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 Kilmessan typically reaches 5, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec124578875321
Data source: Kilmessan 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 Kilmessan Compares to Other Months

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

This table compares monthly weather conditions in Kilmessan, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather6°C (42°F)51 mm (2.0 inches)85%low
February Weather6°C (43°F)78 mm (3.1 inches)86%low
March Weather7°C (45°F)77 mm (3.0 inches)86%moderate
April Weather9°C (48°F)45 mm (1.8 inches)85%moderate
May Weather12°C (53°F)65 mm (2.6 inches)83%high
June Weather15°C (58°F)72 mm (2.8 inches)85%very high
July Weather16°C (61°F)68 mm (2.7 inches)86%very high
August Weather15°C (60°F)94 mm (3.7 inches)85%high
September Weather14°C (57°F)66 mm (2.6 inches)86%moderate
October Weather11°C (51°F)74 mm (2.9 inches)87%moderate
November Weather8°C (46°F)80 mm (3.2 inches)86%low
December Weather6°C (44°F)85 mm (3.3 inches)84%low

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