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May Weather in Castletown, Ireland

Last updated: August 23, 2025

In May, the average temperature in Castletown, Ireland hovers around 11°C (52°F). Expect a minimum of 1°C (33°F) and a maximum of 21°C (69°F). With an average humidity of 83%, you may want to prepare for some damp days, as 70 mm (2.8 in) of precipitation is typically spread across 12 days.

May Temperature in Castletown

In May in Castletown, the average temperature is 11°C (52°F). The maximum can reach 21°C (69°F), while the minimum can drop to as low as 1°C (33°F). This varied climate makes Castletown an ideal destination for travelers looking to experience a mix of mild and cooler weather conditions.

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

The chart illustrates May temperature patterns in Castletown, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Castletown, May typically has an average temperature of 11°C (52°F), with highs reaching up to 21°C (69°F) and lows dropping to around 1°C (33°F).
JanFebMarAprMayJunJulAugSepOctNovDec434344475257616057524744
Data source: Temperature data for Castletown 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 Castletown

In Castletown in May, the precipitation amount is 70 mm (2.8 in) over the course of 12 days.

May Precipitation Trends in Castletown

The chart displays monthly precipitation patterns in Castletown, 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 Castletown, May typically receives around 70 mm (2.8 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec53887955706768967693108107
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Castletown

In Castletown 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 Castletown

This chart illustrates the average monthly humidity levels in Castletown, 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 Castletown 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 Castletown

In Castletown 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 Castletown.

Maximum UV Index Levels in Castletown for May

The chart shows the monthly maximum UV Index (UVI) for Castletown 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 Castletown typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec124578875421
Data source: Castletown 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 Castletown Compares to Other Months

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

This table compares monthly weather conditions in Castletown, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather6°C (43°F)53 mm (2.1 inches)85%low
February Weather6°C (44°F)87 mm (3.4 inches)86%low
March Weather7°C (45°F)79 mm (3.1 inches)86%moderate
April Weather8°C (47°F)55 mm (2.2 inches)85%moderate
May Weather11°C (52°F)70 mm (2.8 inches)83%high
June Weather14°C (57°F)67 mm (2.6 inches)85%very high
July Weather16°C (61°F)68 mm (2.7 inches)86%very high
August Weather15°C (60°F)96 mm (3.8 inches)85%high
September Weather14°C (57°F)76 mm (3.0 inches)86%moderate
October Weather11°C (52°F)93 mm (3.6 inches)87%moderate
November Weather8°C (47°F)108 mm (4.3 inches)86%low
December Weather7°C (44°F)107 mm (4.2 inches)84%low

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