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May Weather in Castleknock, Ireland

Last updated: August 23, 2025

In Castleknock, Ireland, the average temperature in May hovers around 11°C (52°F), with a minimum of 0°C (32°F) and a maximum of 21°C (71°F). Expect a moderate amount of precipitation, averaging 72 mm (2.8 in) over about 14 days, alongside a notable average humidity of 83%.

May Temperature in Castleknock

In May in Castleknock, the average temperature is 11°C (52°F). The maximum can reach 21°C (71°F) and the minimum can be as low as 0°C (32°F). This makes Castleknock a great destination for travelers seeking mild weather, but it's advisable to pack layers to adapt to temperature fluctuations.

May Weather in Castleknock: Daily Temperature Highs, Lows, and Averages

The chart illustrates May temperature patterns in Castleknock, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Castleknock, May typically has an average temperature of 11°C (52°F), with highs reaching up to 21°C (71°F) and lows dropping to around 0°C (32°F).
JanFebMarAprMayJunJulAugSepOctNovDec424344475257605956514643
Data source: Temperature data for Castleknock 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.

May Precipitation in Castleknock

In Castleknock in May, the total precipitation amount is 72 mm (2.8 in) spread over the course of 14 days.

May Precipitation Trends in Castleknock

The chart displays monthly precipitation patterns in Castleknock, with values for each month alongside May’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how May’s conditions compare to those of other months. In Castleknock, May typically receives around 72 mm (2.8 inches) of precipitation spread over approximately 14 days.
JanFebMarAprMayJunJulAugSepOctNovDec578081527275809573879794
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Castleknock

In Castleknock in May humidity is 83%. With an average temperature of 11°C (52°F), this humidity feels like a damp chill that can make outdoor activities uncomfortable, often leading travelers to seek shelter indoors or to dress in layered clothing to stay warm while exploring the area.

May Average Humidity in Castleknock

This chart illustrates the average monthly humidity levels in Castleknock, with May’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In May, average humidity in Castleknock is approximately 83%, 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 May generated using information from the Copernicus Climate Change Service.

May UV Index in Castleknock

In Castleknock in May, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in Castleknock.

Maximum UV Index Levels in Castleknock for May

The chart shows the monthly maximum UV Index (UVI) for Castleknock in May, 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 May, the maximum UV index in Castleknock typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec124578875321
Data source: Castleknock May 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 May Weather in Castleknock Compares to Other Months

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

This table compares monthly weather conditions in Castleknock, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather5°C (42°F)57 mm (2.2 inches)85%low
February Weather6°C (43°F)80 mm (3.1 inches)86%low
March Weather7°C (44°F)81 mm (3.2 inches)86%moderate
April Weather8°C (47°F)52 mm (2.0 inches)85%moderate
May Weather11°C (52°F)72 mm (2.8 inches)83%high
June Weather14°C (57°F)75 mm (3.0 inches)85%very high
July Weather16°C (60°F)80 mm (3.2 inches)86%very high
August Weather15°C (60°F)95 mm (3.8 inches)85%high
September Weather13°C (56°F)73 mm (2.9 inches)86%moderate
October Weather11°C (51°F)87 mm (3.4 inches)87%moderate
November Weather8°C (46°F)97 mm (3.8 inches)86%low
December Weather6°C (44°F)94 mm (3.7 inches)84%low

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