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May Weather in Castleisland, Ireland

Last updated: August 23, 2025

In May, the average temperature in Castleisland, Ireland is a comfortable 11°C (52°F). Expect a chilly low of -1°C (31°F) and a pleasant high of 23°C (74°F). With 69 mm (2.7 in) of precipitation spread over 13 days, you might want to keep an umbrella handy. The air is notably humid, with an average humidity level of 83%.

May Temperature in Castleisland

In May in Castleisland, the average temperature is 11°C (52°F), with maximums reaching up to 23°C (74°F) and minimums dropping as low as -1°C (31°F). This range of temperatures makes Castleisland a great destination for travelers seeking a mix of mild and cool weather during their visit.

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

The chart illustrates May temperature patterns in Castleisland, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Castleisland, May typically has an average temperature of 11°C (52°F), with highs reaching up to 23°C (74°F) and lows dropping to around -1°C (31°F).
JanFebMarAprMayJunJulAugSepOctNovDec434444485256595956514645
Data source: Temperature data for Castleisland 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 Castleisland

In Castleisland in May, the precipitation amount is 69 mm (2.7 in) over the course of 13 days.

May Precipitation Trends in Castleisland

The chart displays monthly precipitation patterns in Castleisland, 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 Castleisland, May typically receives around 69 mm (2.7 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec74118104656964681148010996126
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Castleisland

In Castleisland 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 Castleisland

This chart illustrates the average monthly humidity levels in Castleisland, 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 Castleisland is approximately 83%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec89%88%87%86%83%83%85%85%88%91%92%89%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Castleisland

In Castleisland 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 Castleisland.

Maximum UV Index Levels in Castleisland for May

The chart shows the monthly maximum UV Index (UVI) for Castleisland 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 Castleisland typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec124678875421
Data source: Castleisland 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 Castleisland Compares to Other Months

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

This table compares monthly weather conditions in Castleisland, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather6°C (43°F)74 mm (2.9 inches)88%low
February Weather7°C (44°F)118 mm (4.6 inches)88%low
March Weather7°C (44°F)104 mm (4.1 inches)87%moderate
April Weather9°C (48°F)65 mm (2.6 inches)86%high
May Weather11°C (52°F)69 mm (2.7 inches)83%high
June Weather13°C (57°F)64 mm (2.5 inches)83%very high
July Weather15°C (60°F)68 mm (2.7 inches)85%very high
August Weather15°C (59°F)114 mm (4.5 inches)85%high
September Weather13°C (56°F)80 mm (3.2 inches)88%moderate
October Weather10°C (51°F)109 mm (4.3 inches)91%moderate
November Weather8°C (47°F)96 mm (3.8 inches)92%low
December Weather7°C (45°F)126 mm (5.0 inches)89%low

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