May Weather in Castlerock, United Kingdom

Last updated: March 17, 2025

May in Castlerock, United Kingdom offers a mild and often damp retreat, with temperatures averaging around 10°C (50°F). The month experiences a maximum temperature reaching 16°C (61°F), while dipping to a cool 5°C (41°F) at night. Rainfall is a frequent companion, with 72 mm (2.9 in) spread over 13 days, contributing to a high humidity level of 82%. This combination of mild temperatures and persistent moisture creates a lush environment, perfect for those who appreciate the beauty of spring in a charming coastal setting.

May Temperature in Castlerock

In May, Castlerock, United Kingdom, experiences a delightful transition as temperatures start to warm up, reaching a minimum of 5°C (41°F) and soaring to a pleasant maximum of 16°C (61°F). This month showcases an average temperature of 10°C (50°F), marking a notable increase from the chill of earlier months. As the landscapes burst into vibrant greens and blossoms, residents and visitors alike relish the mild weather, a stark contrast to the frigid winter months. The climb in temperatures hints at the impending warmth of June, making May a perfect time for outdoor activities and exploration in this picturesque coastal town.

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

The chart illustrates May temperature patterns in Castlerock, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec454444465054575856534946
Data source: Temperature data for Castlerock generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

May Precipitation in Castlerock

In May, Castlerock experiences a notable shift in precipitation, with an average of 72 mm (2.9 in) of rainfall spread over 13 days. This marks a decrease from the wetter months of January through April, where the rainfall averages were significantly higher, with April alone receiving 55 mm (2.2 in) in just 12 days. As spring approaches its end, May's moderate precipitation signals a transition toward the drier summer months ahead, highlighted by a marked drop compared to the 132 mm (5.2 in) recorded in February and 109 mm (4.3 in) in January. This reduction hints at a seasonal pattern where the increased sunshine and warmer temperatures of late spring may begin to dominate, providing a refreshing contrast to the earlier, rain-laden months.

May Precipitation Trends in Castlerock

The chart displays monthly precipitation patterns in Castlerock, 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.
JanFebMarAprMayJunJulAugSepOctNovDec1091321125573105110146117161156166
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

May Humidity in Castlerock

In May, Castlerock experiences a slight dip in humidity, with levels around 82%, marking a transition towards the warmer months. This reduction continues a gradual trend observed from January through April, where humidity starts high at 87% but consistently declines as spring unfolds. While May brings a breath of fresh air, the humidity levels remain within a comfortable range compared to the peak summer months, where July and August often hover around 86%. As we approach summer, the humidity begins to rise again, suggesting that this coastal town balances both moisture and warmth, creating an inviting atmosphere for locals and visitors alike.

May Average Humidity in Castlerock

This chart illustrates the average monthly humidity levels in Castlerock, with May's data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, allowing you to see how May's humidity levels compare to other months.
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 Castlerock

As spring unfolds into May, Castlerock experiences a noticeable uptick in the UV Index, reaching a high level of 6, which signifies an increased risk of harm from unprotected sun exposure. This shift from the moderate levels seen in both March and April reflects the gradual ramp-up of outdoor activities as warmer weather invites residents and visitors alike to embrace the sunshine. With a burn time of just 25 minutes, it's crucial to prioritize sun protection strategies this month. Those planning to spend time outdoors should remain vigilant, as May sets the stage for the even higher UV levels that will characterize the upcoming summer months. To stay informed on daily UV forecasts and take necessary precautions, check out Castlerock UV Index.

Maximum UV Index Levels in Castlerock for May

The chart shows the monthly maximum UV Index (UVI) for Castlerock 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.
JanFebMarAprMayJunJulAugSepOctNovDec123568865321
Data source: Castlerock 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.

May Sunshine in Castlerock

May in Castlerock is a time of vibrant illumination, as the days lengthen and the sun shines brighter than in any other month, boasting an impressive 405 hours of sunshine. This increase from April's 319 hours signals the arrival of summer, setting the stage for a warm and inviting atmosphere. Following the curve of spring, where hours of sunlight steadily rise from January's mere 72 hours to May's peak, we see a delightful trend of growing light that continues into the early summer months. Interestingly, June and July maintain high sunshine levels, with 389 and 404 hours, respectively, before a gradual decline sets in toward autumn. September still offers a respectable 283 hours, but the shimmering bounty of May remains a highlight, marking a season of warmth and outdoor enjoyment in this charming coastal town.

Monthly Sunshine Duration in Castlerock: May Highlighted

The May sunshine duration represents the total number of hours Castlerock experiences direct sunlight during the month of May, excluding cloudy or obstructed periods. This chart compares the sunshine duration of May with the other months of the year.
JanFebMarAprMayJunJulAugSepOctNovDec72h146h207h319h405h389h404h357h283h224h117h81h
Data source: Castlerock May Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Castlerock During May

May in Castlerock, United Kingdom, offers a promising opportunity for sunny weather, boasting a 36% chance of sunshine. This marks a significant improvement from the preceding months, where April leads with 43% sunshine likelihood, but May holds its own as one of the brighter months. Following the cooler and cloudier months of January through March, which see chances dip as low as 15%, May's sunniness is welcomed by residents and visitors alike as they look forward to the summer. Although June takes a slight dip to 22%, May stands out as a pivotal transitional month, hinting at the arrival of warmer days ahead. So, those planning outdoor activities can feel optimistic about enjoying the sun in Castlerock this May!

Percentage of Sunny Days in May in Castlerock

The chart illustrates the percentage of sunny days in Castlerock throughout the year, with May highlighted. It highlights the variation in sunshine across each month and provides an overview of the typical frequency of sunny days, offering insights into how often Castlerock experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec23%25%15%43%36%22%24%20%23%16%16%14%
Data source: Castlerock May chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Castlerock in May

As winter fades and spring ushers in longer days, May stands out in Castlerock, United Kingdom, boasting an impressive 16 hours of daylight. This monthly peak reflects a clear upward trend from the 7 hours of daylight experienced in January, culminating in a steady rise as the seasons progress. By May, residents and visitors alike revel in extended evenings filled with vibrant activity, a delightful contrast to the gradual decline back to shorter days that begins in June. The transition from the 14 hours in April to May's brightness signifies not just an increase in sunlight, but also a rejuvenation of outdoor life in this coastal gem.

Average Daylight Hours in Castlerock for May

The chart illustrates the variation in daylight duration in Castlerock throughout the year, with May highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec7h 49m9h 40m11h 53m14h 10m16h 11m17h 17m16h 41m14h 51m12h 39m10h 24m8h 21m7h 13m
Data source: Castlerock daylight hours, calculated by summing the hours between sunrise and sunset for each day.

May Winds in Castlerock

In May, Castlerock experiences a slight breeze, with an average wind speed of 6.2 m/s (14 mph), a small uptick from the calmer April winds at 5.9 m/s (13 mph). As spring transitions into summer, this gentle wind sets a pleasant tone, contrasting with the more robust gusts characteristic of early winter and late autumn, where average speeds soar above 9 m/s. Notably, the warmer months typically bring lighter winds, with July experiencing a significant drop to 3.8 m/s (8 mph). This trend highlights May’s winds as a refreshing prelude to the tranquil summer days ahead, underscoring a shift from the brisk winds of winter as the region welcomes milder weather and blooming landscapes.

Average May Wind Speed in Castlerock

The chart displays monthly wind speed patterns in Castlerock, with values for each month shown alongside May's data, which is highlighted for easy comparison. It illustrates the average wind speed, offering insights into how May's wind conditions compare to the rest of the year.
JanFebMarAprMayJunJulAugSepOctNovDec7.810.57.55.96.2 m/s5.73.84.55.57.79.38.3
Data source: Castlerock May wind data, generated using information from the Copernicus Climate Change Service.

How May Weather in Castlerock Compares to Other Months

The weather in Castlerock changes throughout the year, offering a unique experience in each season. Below is a month-by-month comparison of May's weather with other months, highlighting differences in temperature, precipitation, and other key factors. Click on each section to discover seasonal trends in Castlerock and find detailed weather information for every month.

May generally offers milder temperatures compared to January, with average highs reaching 16°C (61°F) and lows around 5°C (41°F), while January sees a max temperature of 13°C (56°F) and a minimum of 2°C (36°F). Precipitation is more frequent in January, with 109 mm (4.3 in) falling over 17 days, compared to 72 mm (2.9 in) over 13 days in May. Additionally, humidity levels are slightly higher in January at 87%, while May experiences an average humidity of 82%. For a detailed look at January weather in Castlerock, check out Castlerock weather in January.

In February, the weather tends to be cooler with average temperatures ranging from a minimum of 1°C (34°F) to a maximum of 12°C (54°F), while May experiences milder conditions, with temperatures ranging from 5°C (41°F) to 16°C (61°F). February also sees higher precipitation, measuring 132 mm (5.2 in) over 18 days, compared to May's 72 mm (2.9 in) over 13 days, indicating that February is generally wetter. Additionally, the humidity levels are slightly higher in February at 86%, compared to May's 82%. For more detailed information on February weather, you can visit Castlerock weather in February.

In comparing the weather between May and March, May generally presents milder temperatures with a minimum of 5°C (41°F) and an average of 10°C (50°F), while March starts colder with a minimum of -1°C (31°F) and an average of 7°C (45°F). The maximum temperature in May reaches 16°C (61°F), offering a more pleasant climate than March's maximum of 12°C (54°F). However, March experiences higher precipitation levels, with 112 mm (4.4 in) over 18 days compared to May's 72 mm (2.9 in) across 13 days. Humidity levels are slightly higher in March at 86%, compared to 82% in May. For more details about March weather specifically, you can visit Castlerock weather in March.

In comparing the weather between April and May, it is evident that May generally offers slightly milder temperatures, with a minimum of 5°C (41°F) and a maximum of 16°C (61°F), compared to April's range of 2°C (36°F) to 13°C (56°F). While both months see substantial rainfall, May records higher precipitation at 72 mm (2.9 in) over 13 days, compared to April’s 55 mm (2.2 in) over 12 days. Humidity levels are also notable, with May at 82% and April slightly higher at 85%. For more specific insights into April weather in Castlerock, you can visit Castlerock weather in April.

May and June exhibit gradually warming temperatures, with June experiencing a slight increase in both minimum and average temperatures compared to May. In May, temperatures range from a minimum of 5°C to a maximum of 16°C, while June temperatures rise slightly to a minimum of 8°C and a maximum of 17°C. However, June brings more precipitation, totaling 105 mm over 17 days, compared to May’s 72 mm over 13 days. Humidity remains relatively high in both months, with June recording 84% compared to May's 82%. To learn more about the specific weather patterns in June, you can visit Castlerock weather in June.

May and July exhibit distinct differences in weather patterns. In May, temperatures range from a chilly 5°C (41°F) to a comfortable maximum of 16°C (61°F), with an average of 10°C (50°F). The month experiences about 72 mm (2.9 in) of precipitation over 13 days, along with a high humidity level of 82%. In contrast, July sees warmer temperatures, with a minimum of 11°C (52°F), an average of 14°C (57°F), and a maximum of 19°C (67°F). However, July is also wetter, recording 110 mm (4.3 in) of rain over 17 days and slightly higher humidity at 86%. For more detailed information on July weather, you can check Castlerock weather in July.

In May, temperatures are cooler with a minimum of 5°C (41°F) and an average of 10°C (50°F), peaking at 16°C (61°F). The month sees around 72 mm (2.9 in) of precipitation over approximately 13 days, and humidity is relatively high at 82%. In contrast, August experiences warmer temperatures, with a minimum of 11°C (52°F) and an average of 14°C (58°F), reaching up to 18°C (66°F). However, it also brings more rainfall, totaling 146 mm (5.7 in) spread over about 20 days, and a slightly higher humidity level at 86%. For a detailed look at the weather during this summer month, you can visit Castlerock weather in August.

In comparing the weather between May and September, May generally experiences milder conditions with average temperatures ranging from a minimum of 5°C (41°F) to a maximum of 16°C (61°F). It also sees 72 mm (2.9 in) of precipitation over approximately 13 days and has an average humidity of 82%. In contrast, September tends to be slightly warmer with average temperatures between 9°C (49°F) and 17°C (64°F), but it also brings more precipitation, totaling 117 mm (4.6 in) across around 20 days, coupled with higher humidity at 88%. For a more detailed look at September weather specifically, you can visit Castlerock weather in September.

May and October exhibit similar maximum temperatures, both hovering around 16°C (61°F), but October is generally milder with a higher average temperature of 12°C (53°F) compared to May's 10°C (50°F). While both months experience cool minimum temperatures of around 5°C (41°F–42°F), October tends to be significantly wetter, with a total precipitation of 161 mm (6.3 in) over 24 days, compared to May's 72 mm (2.9 in) over just 13 days. Additionally, humidity levels are elevated in October, reaching 89%, compared to May's 82%, contributing to a moister atmosphere. For more insights on October weather, visit Castlerock weather in October.

May and November present contrasting weather patterns. In May, temperatures range from a minimum of 5°C (41°F) to a pleasant maximum of 16°C (61°F), with an average of 10°C (50°F). The month experiences around 72 mm (2.9 in) of precipitation over approximately 13 days and maintains a humidity level of 82%. In contrast, November tends to be chillier, with temperatures dipping slightly, ranging from 4°C (40°F) to a maximum of 14°C (58°F) and averaging 9°C (49°F). This month is considerably wetter, receiving 156 mm (6.2 in) of rain over about 23 days, coupled with a higher humidity of 90%. For a detailed look at November weather specifics, check Castlerock weather in November.

May and December present contrasting weather profiles, reflecting the shift from spring to winter. In May, temperatures range from a minimum of 5°C (41°F) to a maximum of 16°C (61°F), with an average of 10°C (50°F). The month typically experiences 72 mm (2.9 in) of precipitation over about 13 days, accompanied by a humidity level of 82%. In contrast, December brings cooler temperatures, with a minimum of 2°C (35°F), an average of 8°C (46°F), and a maximum of 12°C (54°F). Precipitation is notably higher at 166 mm (6.5 in) across around 23 days, along with increased humidity at 86%. For those interested in more specific details about December's weather, you can check Castlerock weather in December.

Compare Castlerock's Climate with Cities Worldwide

Conclusion: What to Expect From May Weather in Castlerock

As May in Castlerock ushers in the transition from the chill of spring to the promise of summer, it brings noticeably milder temperatures compared to the preceding months. With warmer daily averages and an increase in humidity, it provides a refreshing change, though the likelihood of rain remains significant, making it one of the wetter months of the year. While enjoying the bloom of nature, visitors should be prepared for those unpredictable showers. For a more in-depth look at the weather patterns throughout the year, visit Castlerock Climate.