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May Weather in Greencastle, Ireland

Last updated: August 23, 2025

In Greencastle, Ireland, the average temperature in May hovers around 10°C (51°F), with a minimum dipping to 4°C (40°F) and a maximum reaching 17°C (63°F). Expect 79 mm (3.1 in) of precipitation over 13 days, contributing to a high average humidity of 82%. Be prepared for a mix of cloudy and wet days during this time!

May Temperature in Greencastle

In May in Greencastle, the average temperature is 10°C (51°F), with maximums reaching up to 17°C (63°F) and minimums dropping as low as 4°C (40°F). This mild climate makes Greencastle a pleasant destination for travelers seeking comfortable weather.

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

The chart illustrates May temperature patterns in Greencastle, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Greencastle, May typically has an average temperature of 10°C (51°F), with highs reaching up to 17°C (63°F) and lows dropping to around 4°C (40°F).
JanFebMarAprMayJunJulAugSepOctNovDec444344465054575856524846
Data source: Temperature data for Greencastle 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 Greencastle

In Greencastle in May, the precipitation amount is 79 mm (3.1 in) over a span of 13 days.

May Precipitation Trends in Greencastle

The chart displays monthly precipitation patterns in Greencastle, 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 Greencastle, May typically receives around 79 mm (3.1 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec1071351236179114118165125169150163
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Greencastle

In Greencastle in May humidity is 82%. With an average temperature of 10°C (51°F), this humidity feels like a damp chill that clings to your skin, making outdoor adventures less appealing and prompting travelers to seek cozy indoor activities or warm drinks to counter the brisk air.

May Average Humidity in Greencastle

This chart illustrates the average monthly humidity levels in Greencastle, 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 Greencastle is approximately 82%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%86%86%85%82%84%86%86%88%89%90%87%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Greencastle

In Greencastle in May, the maximum UV index is 6, which corresponds to a high Exposure Category. The time to burn is approximately 25 minutes. To find the hourly UV index in Greencastle, you can refer to this Hourly UV Index in Greencastle.

Maximum UV Index Levels in Greencastle for May

The chart shows the monthly maximum UV Index (UVI) for Greencastle 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 Greencastle typically reaches 6, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec124568875321
Data source: Greencastle 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 Greencastle Compares to Other Months

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

This table compares monthly weather conditions in Greencastle, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather7°C (44°F)106 mm (4.2 inches)87%low
February Weather6°C (44°F)135 mm (5.3 inches)86%low
March Weather7°C (44°F)123 mm (4.8 inches)86%moderate
April Weather8°C (47°F)61 mm (2.4 inches)85%moderate
May Weather10°C (51°F)79 mm (3.1 inches)82%high
June Weather12°C (54°F)114 mm (4.5 inches)84%very high
July Weather14°C (57°F)118 mm (4.7 inches)86%very high
August Weather14°C (58°F)165 mm (6.5 inches)86%high
September Weather13°C (56°F)125 mm (4.9 inches)88%moderate
October Weather11°C (53°F)169 mm (6.6 inches)89%moderate
November Weather9°C (49°F)150 mm (5.9 inches)90%low
December Weather8°C (46°F)163 mm (6.4 inches)86%low

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