May Weather in Saint Helier, Jersey

Last updated: August 21, 2025

In May, Saint Helier, Jersey experiences a delightful transition into warmer weather, with maximum temperatures reaching up to 20°C (69°F) and an average of 13°C (55°F). The evenings can turn cooler, with minimum temperatures dipping to 7°C (46°F). This month typically sees about 63 mm (2.5 in) of rain, spread over 10 days, making it one of the wetter months. With an average humidity level of 80%, May offers a fresh maritime climate, perfect for enjoying the lush green landscapes and vibrant coastal scenery.

May Temperature in Saint Helier

In May, Saint Helier, Jersey, begins to embrace the delights of spring, with temperatures gracefully rising as the month progresses. The minimum temperature settles at a comfortable 7°C (46°F), while the average temperature reaches 13°C (55°F), peaking at a delightful 20°C (69°F) on the warmest days. This upward trend from April's cooler averages not only marks a significant leap but also sets the stage for the summery warmth of June that follows. With each passing day, the transition from the brisk chill of winter to the more inviting and vibrant atmosphere of spring becomes palpably evident, making May an ideal time to explore the scenic beauty of Jersey.

May Weather in Saint Helier: Daily Temperature Highs, Lows, and Averages

The chart illustrates May temperature patterns in Saint Helier, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Saint Helier, May typically has an average temperature of {2}°C ({3}°F), with highs reaching up to {4}°C ({5}°F) and lows dropping to around {6}°C ({7}°F).
JanFebMarAprMayJunJulAugSepOctNovDec474748505560636462595350
Data source: Temperature data for Saint Helier 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 Saint Helier

In May, Saint Helier experiences a moderate level of precipitation, with an average of 63 mm (2.5 in) falling over 10 days. This represents a slight increase from the preceding month of April, which saw a mere 36 mm (1.4 in) over 8 days, signaling the onset of more frequent showers as spring transitions into summer. The rainfall pattern in May tends to be more consistent compared to the drier conditions of previous months, yet it's still notably lower than the heavy downpours of the autumn months, such as October’s staggering 157 mm (6.2 in). As such, May strikes a balance between the lingering chill of spring and the burgeoning warmth of summer, providing refreshing rains that nourish the blooming landscape.

May Precipitation Trends in Saint Helier

The chart displays monthly precipitation patterns in Saint Helier, 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 Saint Helier, May typically receives around {2} mm ({3} inches) of precipitation spread over approximately {4} days.
JanFebMarAprMayJunJulAugSepOctNovDec979084366371476682157125185
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Saint Helier

In May, Saint Helier, Jersey experiences a refreshing dip in humidity, with levels around 80%. This marks a noticeable decline from the persistently high humidity of the earlier months, such as 90% in January and 89% in February. The trend continues into June, where humidity remains steady at 80%, suggesting a shift toward drier summer conditions. As the year progresses, humidity levels fall to their lowest in July at 69%, creating an enjoyable atmosphere for outdoor activities. This gradual decrease from late spring to early summer highlights the unique climatic patterns of Saint Helier, where the transition into brighter months brings a breath of fresh air.

May Average Humidity in Saint Helier

This chart illustrates the average monthly humidity levels in Saint Helier, 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 Saint Helier is approximately {2}%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec90%89%86%85%80%80%69%73%79%89%92%92%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Saint Helier

As spring unfolds in Saint Helier, Jersey, the UV Index rises steadily, peaking at 7 in May, signaling a high exposure category. This is a notable increase from the moderate levels seen in March and April, where the burn time decreased to just 25 minutes in both months. As sunnier days approach, the UV Index indicates that residents and visitors should be extra mindful of sun protection. With the incorporation of rising temperatures and brighter skies, May offers the perfect backdrop for outdoor activities, but it's essential to stay vigilant against potential sunburn. Following May, the UV Index escalates even further in June and July, reaching very high levels. So, whether you're enjoying a day at the beach or exploring local parks, check the latest readings on the Saint Helier UV Index to ensure you're well-prepared for safe sun exposure!

Maximum UV Index Levels in Saint Helier for May

The chart shows the monthly maximum UV Index (UVI) for Saint Helier 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 Saint Helier typically reaches {2}, which falls under the {3} exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec234679986421
Data source: Saint Helier 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 Saint Helier

Experience the radiant glow of May in Saint Helier, Jersey, where the sun shines brightly for an impressive 412 hours. This month marks a significant leap from the 356 hours of sunshine in April, showcasing a delightful transition into the summer season. As spring fades, May stands out, outshining its predecessors and heralding the bustling summer months ahead. Following closely behind, June and July maintain a strong showing with 408 and 432 hours of sunshine, respectively, before a gradual tapering begins in August. Collectively, this sunny stretch invites residents and visitors alike to revel in the outdoor beauty and vibrant energy that defines Saint Helier during this enchanting time of year.

Monthly Sunshine Duration in Saint Helier: May Highlighted

The May sunshine duration represents the total number of hours Saint Helier 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.
JanFebMarAprMayJunJulAugSepOctNovDec104h166h239h356h412h408h432h392h334h270h184h132h
Data source: Saint Helier May Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Saint Helier During May

In Saint Helier, Jersey, the likelihood of sunny weather in May stands at 41%, a slight dip from the more promising 64% observed in April. This fluctuation is part of a broader trend where the region experiences its peak sunshine probabilities in the spring months, before dipping again in early summer. With June and July showing 34% and 46% chances of sun respectively, May is positioned as a transitional month, promising a mix of sunny days and showers. As the weather warms, visitors can expect the playful dance of clouds and sun that characterizes this charming coastal locale, making May a delightful time to explore the vibrant landscapes of Jersey.

Percentage of Sunny Days in May in Saint Helier

The chart illustrates the percentage of sunny days in Saint Helier 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 Saint Helier experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec20%30%41%64%42%34%46%41%43%36%32%25%
Data source: Saint Helier May chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Saint Helier in May

As spring blossoms into summer in Saint Helier, Jersey, the increase in daylight hours paints a vivid picture of the changing seasons. Starting with a modest 8 hours in January, the days gradually stretch, reaching a notable 15 hours in May. This month marks a delightful turning point, as the sun lingers longer in the sky, inviting residents and visitors alike to revel in outdoor activities and longer evenings. The trend continues into June, peaking at 16 hours of daylight before gradually tapering off in the subsequent months. By September, daylight slips back to 12 hours, ushering in the cozy comforts of autumn. Overall, this rhythm of increasing and then decreasing daylight beautifully reflects the seasonal cycle, enhancing the charm of life in this picturesque locale.

Average Daylight Hours in Saint Helier for May

The chart illustrates the variation in daylight duration in Saint Helier throughout the year, with May highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec8h 42m10h 8m11h 55m13h 45m15h 19m16h 8m15h 42m14h 18m12h 32m10h 43m9h 6m8h 15m
Data source: Saint Helier daylight hours, calculated by summing the hours between sunrise and sunset for each day.

May Winds in Saint Helier

In May, Saint Helier, Jersey, experiences a refreshing average wind speed of 7.8 m/s (18 mph), matching the breezy conditions seen at the start of the year. As spring transitions into summer, the wind picks up slightly from the calmer days of April (6.3 m/s) and remains consistent with the gusty beginnings of the year from January and February. Interestingly, June witnesses a notable drop to 4.4 m/s (10 mph), signaling the start of a trend where the summer months typically see more gentle breezes. This pattern highlights May as one of the last robust months of wind before the air becomes warmer and more tranquil, perfect for outdoor activities while still enjoying the invigorating feel of the sea breeze.

Average May Wind Speed in Saint Helier

The chart displays monthly wind speed patterns in Saint Helier, 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.
JanFebMarAprMayJunJulAugSepOctNovDec7.88.27.06.37.8 m/s4.45.86.25.67.46.78.7
Data source: Saint Helier May wind data, generated using information from the Copernicus Climate Change Service.

How May Weather in Saint Helier Compares to Other Months

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

In comparing the weather of May and January, May generally offers milder temperatures, with a minimum of 7°C (46°F) and an average of 13°C (55°F) compared to January's chillier minimum of 2°C (35°F) and an average of 8°C (47°F). May experiences maximum temperatures reaching up to 20°C (69°F), significantly warmer than January's peak of 13°C (56°F). While both months see a fair amount of precipitation, January tends to be wetter, with 97 mm (3.8 in) over 14 days compared to May's 63 mm (2.5 in) over 10 days. Additionally, humidity levels are slightly lower in May at 80%, versus January's 90%. For a closer look at the specifics of January weather, you can visit Saint Helier weather in January.

In comparing the weather between May and February, we can observe several key differences. May typically enjoys milder temperatures, ranging from a minimum of 7°C (46°F) to a maximum of 20°C (69°F), with an average of 13°C (55°F). In contrast, February's temperatures are considerably cooler, with a minimum of -1°C (31°F) and a maximum of 13°C (56°F), averaging at 8°C (47°F).

February also sees more precipitation, with 90 mm (3.5 in) over 16 days, compared to May's 63 mm (2.5 in) over 10 days. Humidity levels are relatively high in both months, but February's 89% is slightly elevated compared to May's 80%. For more detailed insights, you can check out Saint Helier weather in February.

In comparing the weather across May and March, May generally offers milder temperatures with a minimum of 7°C (46°F) and an average high of 20°C (69°F), while March experiences cooler minimum temperatures dropping to -2°C (29°F) and an average high of only 14°C (58°F). Precipitation is slightly lower in May, with 63 mm (2.5 in) over approximately 10 days, compared to March's 84 mm (3.3 in) spread over 15 days. Additionally, humidity remains high in both months, with May at 80% and March slightly higher at 86%. For a more detailed look at March weather specifics, check out Saint Helier weather in March.

Comparing the weather in May and April reveals notable differences in temperature and precipitation. In May, temperatures range from a minimum of 7°C (46°F) to a maximum of 20°C (69°F), with an average of 13°C (55°F). This marks a slight increase from April, where the temperatures range from 5°C (41°F) to 17°C (62°F) and an average of 10°C (51°F). Additionally, May experiences more precipitation, totaling 63 mm (2.5 in) over 10 days, compared to April’s 36 mm (1.4 in) over 8 days. Interestingly, while May is slightly warmer, April retains a higher humidity level at 84% compared to May's 80%. For more details on April weather, you can check Saint Helier weather in April.

May and June showcase a notable transition in weather patterns. In May, temperatures range from a chilly minimum of 7°C (46°F) to a comfortable maximum of 20°C (69°F), with an average of 13°C (55°F). The month experiences about 63 mm (2.5 in) of precipitation over 10 days, accompanied by high humidity of 80%. In contrast, June sees a slight increase in temperatures, with minimums at 11°C (53°F) and maximums reaching 24°C (76°F), averaging 15°C (60°F). Although June has higher precipitation at 71 mm (2.8 in) and maintains similar humidity levels at 80%, the overall warmth is a clear indicator of the approaching summer. For more detailed insights, check out Saint Helier weather in June.

May and July exhibit quite distinct weather patterns. In May, temperatures range from a chilly minimum of 7°C (46°F) to a comfortable high of 20°C (69°F), with an average temperature of 13°C (55°F). This month experiences about 63 mm (2.5 in) of precipitation spread over 10 days, coupled with a high humidity of 80%. In contrast, July features warmer temperatures, with a minimum of 14°C (58°F) and a maximum of 27°C (80°F), averaging 17°C (63°F). Rainfall decreases to 47 mm (1.9 in) over 9 days, and humidity also drops to 69%. For more details on July weather, check this Saint Helier weather in July.

In May, the weather in Saint Helier features cooler temperatures, with a minimum of 7°C (46°F) and an average of 13°C (55°F), peaking at a maximum of 20°C (69°F). This month experiences around 63 mm (2.5 in) of precipitation spread over 10 days, accompanied by higher humidity levels at 80%. In contrast, August brings warmer conditions, with a minimum temperature of 14°C (57°F), an average of 18°C (64°F), and a maximum of 25°C (78°F). Although August sees slightly higher precipitation at 66 mm (2.6 in) over 13 days, the humidity drops to a more comfortable 73%. For a more detailed look at the weather in August, check out Saint Helier weather in August.

In May, the weather tends to be cooler, with temperatures ranging from a minimum of 7°C (46°F) to a maximum of 20°C (69°F) and an average of 13°C (55°F). This month sees around 63 mm (2.5 in) of precipitation over approximately 10 days, along with a relatively high humidity level of 80%.

In contrast, September enjoys milder temperatures, with a minimum of 12°C (54°F), an average of 17°C (63°F), and a maximum of 23°C (75°F). Although September experiences slightly more rainfall, at 82 mm (3.2 in) over about 11 days, the humidity remains similar at 79%. For more details about September's climate, you can check Saint Helier weather in September.

May and October in Saint Helier exhibit some similarities in temperature, with daytime highs reaching around 20°C (69°F) in both months. However, May tends to be slightly milder on average, with a minimum temperature of 7°C (46°F) compared to October's 9°C (48°F). The key difference lies in the precipitation and humidity; May experiences a total of 63 mm (2.5 in) of rainfall over approximately 10 days, while October sees a significant increase, with 157 mm (6.2 in) of rainfall over 19 days and higher humidity at 89%. This contrast highlights October's much wetter and more humid climate. For more detailed information, you can check the Saint Helier weather in October.

In comparing the weather between May and November, we observe notable differences in temperature and precipitation. May typically experiences milder temperatures, with average highs around 20°C (69°F) compared to November’s max of 17°C (62°F). However, November is considerably wetter, receiving 125 mm (4.9 in) of precipitation over 18 days, while May sees only 63 mm (2.5 in) over 10 days. Additionally, November's humidity peaks at 92%, compared to May's 80%, contributing to a damp and cooler feel as winter approaches. For more detailed information, you can check Saint Helier weather in November.

May and December present quite different weather patterns. In May, temperatures range from a minimum of 7°C (46°F) to a maximum of 20°C (69°F), with an average of 13°C (55°F). The month sees about 63 mm (2.5 in) of precipitation over approximately 10 days, and humidity levels are relatively comfortable at around 80%. In contrast, December is much colder, with temperatures dipping to a minimum of 3°C (38°F) and peaking at 14°C (57°F), leading to an average of 10°C (50°F). This month experiences significantly more rainfall, totaling 185 mm (7.3 in) across 22 days, accompanied by higher humidity at 92%. For a detailed look at the December weather conditions, you can check Saint Helier weather in December.

Compare Saint Helier's Climate with Cities Worldwide

Conclusion: What to Expect From May Weather in Saint Helier

As the island of Jersey welcomes May, the weather brings a delightful shift, offering a pleasant respite from the chill of earlier months. With temperatures rising, days become noticeably warmer, making outdoor exploration a joy. However, expect occasional rain, as precipitation is still present but slightly lower than in the winter months. While humidity levels remain high, the balmy atmosphere encourages the lush scenery to thrive, creating a beautiful backdrop for spring activities. May in Saint Helier is truly a vibrant blend of sunshine and showers, marking a delightful transition toward summer. For more insights on weather patterns, visit Saint Helier Climate.