May Weather in Hilton Head Island, United States

Last updated: February 24, 2025

May on Hilton Head Island offers a delightful blend of warm weather and refreshing coastal breezes. With maximum temperatures soaring up to 34°C (94°F) and an average of 23°C (74°F), this month invites outdoor adventures and beach relaxation. However, evenings can bring a cool reprieve, with minimum temperatures dipping to 12°C (53°F). May also sees approximately 89 mm (3.5 in) of rain over 10 days, contributing to the island's lush greenery, while humidity often hovers around 75%, adding a tropical feel to the atmosphere. Embrace the charm of this beautiful island during one of its most inviting months!

May Temperature in Hilton Head Island

In May, Hilton Head Island experiences a delightful transition into warmer weather, with temperatures reflecting the burgeoning summer season. The minimum temperature rises to a comfortable 12°C (53°F), while the average temperature reaches a pleasant 23°C (74°F), creating the perfect backdrop for outdoor activities. The highlight of this month is the peak temperature soaring to 34°C (94°F), inviting beachgoers and nature enthusiasts alike to revel in the island's stunning landscapes. Compared to the cooler months of January through April, May marks a significant warming trend, signaling the approach of summer adventures on this picturesque island. The combination of balmy air and sunny days makes Hilton Head a prime destination for those seeking both relaxation and recreation.

May Weather in Hilton Head Island: Daily Temperature Highs, Lows, and Averages

The chart illustrates May temperature patterns in Hilton Head Island, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec535761677479828179736055
Data source: Temperature data for Hilton Head Island 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 Hilton Head Island

In May, Hilton Head Island experiences a notable uptick in precipitation, totaling 89 mm (3.5 in) over 10 days of rainfall. This marks a gradual rise from the previous months, establishing May as one of the wetter periods leading into the summer. As temperatures warm, the island transitions towards its peak wet season, with rainfall set to escalate in June and July. Notably, May’s precipitation serves as a precursor to the heavier downpours that characterize the upcoming months, highlighting a clear trend of increasing moisture that fans the lush greenery and vibrant blooms of the island’s landscape. This blend of warmth and rain nurtures the picturesque setting that Hilton Head Island is renowned for, making it a prime time for outdoor enthusiasts to enjoy the beauty of nature, even if occasional showers may briefly pause their adventures.

May Precipitation Trends in Hilton Head Island

The chart displays monthly precipitation patterns in Hilton Head Island, 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.
JanFebMarAprMayJunJulAugSepOctNovDec62806885891221561801278890125
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Hilton Head Island

In May, Hilton Head Island experiences a comfortable humidity level of 75%, marking a gradual decline from the wetter months of winter and early spring. This downward trend continues into June, where humidity remains steady at the same level, creating an appealing climate for outdoor activities. Compared to the earlier months—where humidity soared above 80%—May represents a sweet spot for visitors, offering warm temperatures without the oppressive stickiness often felt during the peak summer months. As the season transitions, humidity begins to rise again in July, yet May stands out as a delightful time to enjoy the island's natural beauty and recreational offerings.

May Average Humidity in Hilton Head Island

This chart illustrates the average monthly humidity levels in Hilton Head Island, 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.
JanFebMarAprMayJunJulAugSepOctNovDec86%81%81%79%75%75%80%81%83%78%85%87%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Hilton Head Island

As spring transitions into summer, Hilton Head Island experiences a dramatic rise in the UV Index, peaking at 11 in May, categorized as extreme. This signifies a critical shift in sun exposure, with the burn time dropping to just 10 minutes for unprotected skin. Following the upward trend from moderate exposure in January to very high levels by April, May marks the beginning of the season when sun safety becomes paramount. With such high UV levels persisting into June and July, it's essential for beachgoers to stay vigilant and protected. For more on how to stay safe under the sun, check out the Hilton Head Island UV Index.

Maximum UV Index Levels in Hilton Head Island for May

The chart shows the monthly maximum UV Index (UVI) for Hilton Head Island 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.
JanFebMarAprMayJunJulAugSepOctNovDec479101111111110864
Data source: Hilton Head Island 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 Hilton Head Island

May brings a splash of sunshine to Hilton Head Island, with 338 hours of glorious sunlight—a peak before summer's full swing. As spring emerges, the island transitions from a chilly 192 hours in January to a vibrant 309 hours in April, showcasing a steady ascent toward this sunny pinnacle. Following May, the sunlight begins a slight decline in June and July, despite remaining abundant with 321 and 347 hours respectively. This trend highlights the gradual shift from the blooming warmth of spring to the balmy embrace of early summer, as visitors flock to enjoy both the bright days and the soft, inviting evenings enveloping this coastal paradise.

Monthly Sunshine Duration in Hilton Head Island: May Highlighted

The May sunshine duration represents the total number of hours Hilton Head Island 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.
JanFebMarAprMayJunJulAugSepOctNovDec192h214h282h309h338h321h347h318h304h294h253h218h
Data source: Hilton Head Island May Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Hilton Head Island During May

May in Hilton Head Island brings a favorable opportunity for sun seekers, with a 53% chance of sunny weather—just slightly below the more promising April. This month stands out in a gradual warming trend, as sunshine probabilities increase from the cooler winter months of January and February. Notably, as the year progresses, the likelihood of sunny days begins a decline into the sweltering summer, reaching a low of 27% in both July and August. However, the bright days of May are a perfect prelude to summer adventures, making it an ideal time to enjoy the beauty of this coastal paradise before the heat sets in.

Percentage of Sunny Days in May in Hilton Head Island

The chart illustrates the percentage of sunny days in Hilton Head Island 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 Hilton Head Island experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec45%38%39%55%53%27%31%27%51%52%61%43%
Data source: Hilton Head Island May chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Hilton Head Island in May

As spring unfolds in Hilton Head Island, May brings a delightful 13 hours of daylight, marking a significant increase in sunshine that characterizes the transition from earlier months. Following the gradual ascent from 10 hours in January to 12 hours in March and April, May stands out as a beacon of brightness, heralding the approach of summer. This trend continues into June, where daylight peaks at 14 hours, offering an abundant opportunity to enjoy the island’s scenic beauty. However, as the summer progresses, daylight begins to wane with July and August both sustaining 13 hours before tapering off in the fall. Overall, May serves as a perfect balance of warmth and light, inviting residents and visitors alike to bask in the island's enchanting atmosphere.

Average Daylight Hours in Hilton Head Island for May

The chart illustrates the variation in daylight duration in Hilton Head Island throughout the year, with May highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec10h 17m11h 2m12h12h 59m13h 48m14h 12m13h 59m13h 15m12h 19m11h 20m10h 29m10h 3m
Data source: Hilton Head Island daylight hours, calculated by summing the hours between sunrise and sunset for each day.

May Winds in Hilton Head Island

As spring transitions into summer, May on Hilton Head Island showcases a delightful consistency in wind patterns, with an average speed of 4.4 m/s (10 mph)—matching March and April's breezy allure. This gentle wind not only enhances the island’s natural beauty but also creates a perfect atmosphere for outdoor activities, from sailing to beach strolls. Interestingly, it marks the beginning of a subtle decline, as summer months like June and July experience lighter breezes, dipping to 4.1 m/s (9 mph) and 3.6 m/s (8 mph) respectively. Overall, May stands out as a month where comfortable, balmy winds elevate the charm of Hilton Head Island, setting the stage for leisurely adventures before the summer heat fully settles in.

Average May Wind Speed in Hilton Head Island

The chart displays monthly wind speed patterns in Hilton Head Island, 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.
JanFebMarAprMayJunJulAugSepOctNovDec4.34.24.44.34.4 m/s4.13.63.43.23.54.03.8
Data source: Hilton Head Island May wind data, generated using information from the Copernicus Climate Change Service.

How May Weather in Hilton Head Island Compares to Other Months

The weather in Hilton Head Island 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 Hilton Head Island and find detailed weather information for every month.

When comparing the weather in May and January, significant differences emerge. May boasts much warmer temperatures, with a minimum of 12°C (53°F) and an average of 23°C (74°F), reaching a high of 34°C (94°F). In contrast, January experiences much cooler weather, starting with a minimum of -5°C (23°F) and an average of 11°C (53°F), peaking at 24°C (75°F). Precipitation is higher in May, totaling 89 mm over about 10 days, compared to January's 61 mm over just 7 days. Additionally, while May has a humidity level of 75%, January is slightly more humid at 86%. For more detailed information about January's weather, you can visit Hilton Head Island weather in January.

When comparing the weather in May and February, it's clear that May is significantly warmer, with average temperatures reaching 23°C (74°F) compared to February's average of 14°C (57°F). The maximum temperatures in May can soar to 34°C (94°F), while February peaks at a milder 25°C (77°F). Although both months experience a similar amount of precipitation—89 mm (3.5 in) in May and 80 mm (3.1 in) in February—May typically has fewer rainy days with precipitation occurring on about 10 days versus 11 in February. Humidity levels are also slightly higher in February at 81%, compared to 75% in May. For a more detailed look at February weather, visit Hilton Head Island weather in February.

In comparing the weather between March and May, it's evident that May brings significantly warmer temperatures, with averages reaching 23°C (74°F) compared to March's cooler average of 16°C (61°F). March experiences a minimum temperature of 1°C (34°F), while May's temperature rarely drops below 12°C (53°F). Precipitation is also a factor; May sees an increase in rainfall with 89 mm (3.5 in) over about 10 days, compared to March's 68 mm (2.7 in) over just 6 days. Additionally, the humidity is slightly lower in May at 75% versus March's higher level of 81%. For more detailed information, check out Hilton Head Island weather in March.

In comparing the weather of May and April, we see a noticeable increase in temperatures, with May boasting an average of 23°C (74°F) compared to April's 19°C (67°F). While both months experience similar levels of precipitation, with May receiving 89 mm (3.5 in) over 10 days and April about 85 mm (3.4 in) over 8 days, May tends to feel more humid at 75% compared to April's 79%. Overall, May offers warmer temperatures, yet both months share a relatively comparable amount of rainfall. For detailed insights into April's weather, you can visit Hilton Head Island weather in April.

In May, the weather is generally warm with minimum temperatures around 12°C (53°F) and an average of 23°C (74°F), reaching a high of 34°C (94°F). The month experiences about 89 mm (3.5 in) of precipitation over approximately 10 days, with humidity levels consistently at 75%. In contrast, June sees a noticeable increase in minimum temperatures, starting at 18°C (64°F) and averaging 26°C (79°F), while still peaking at 34°C (93°F). However, June is wetter, with 122 mm (4.8 in) of rain over 18 days, maintaining the same humidity level. For more detailed information, check out Hilton Head Island weather in June.

May and July exhibit notable differences in weather patterns, particularly in temperature and precipitation. In May, temperatures range from a minimum of 12°C (53°F) to a maximum of 34°C (94°F), with an average of 23°C (74°F). The month receives about 89 mm (3.5 in) of precipitation over approximately 10 days, while humidity hovers around 75%. In contrast, July brings warmer conditions with a minimum temperature of 23°C (73°F) and a maximum of 35°C (95°F), averaging 28°C (82°F). This month sees increased precipitation, totaling 156 mm (6.1 in) over 19 days, accompanied by a higher humidity level of 80%. For more details on July's weather, you can check out Hilton Head Island weather in July.

May and August present distinct weather characteristics, showcasing a transition from spring to summer. In May, temperatures range from a comfortable minimum of 12°C (53°F) to an average of 23°C (74°F), peaking at 34°C (94°F), alongside a moderate humidity level of 75%. The month experiences approximately 89 mm (3.5 in) of precipitation over 10 days, making it relatively wet. In contrast, August is significantly warmer with minimum temperatures starting at 22°C (73°F) and averaging 27°C (82°F), while still reaching highs of 34°C (94°F). However, it is also much wetter, accumulating around 180 mm (7.1 in) of rain over 22 days, accompanied by higher humidity at 81%. For a detailed look at August weather, check out Hilton Head Island weather in August.

May and September present warm and humid weather, yet show notable differences. In May, temperatures range from a minimum of 12°C (53°F) to a maximum of 34°C (94°F), with an average of 23°C (74°F), alongside 89 mm (3.5 inches) of precipitation over about 10 days. In contrast, September experiences slightly warmer conditions, with minimum temperatures of 16°C (61°F) and averages reaching 26°C (79°F), while still peaking at 34°C (93°F). However, September sees increased rainfall, totaling 127 mm (5.0 inches) across approximately 15 days, accompanied by higher humidity levels at 83%. For more details about the weather during this month, check out Hilton Head Island weather in September.

May and October present contrasting yet comfortable weather patterns. In May, temperatures range from a mild 12°C (53°F) at night to a warm 34°C (94°F) during the day, with an average of 23°C (74°F). This month sees a higher humidity level at 75% and approximately 10 days of precipitation totaling 89 mm (3.5 in). In comparison, October offers cooler nights with temperatures dropping to a minimum of 6°C (42°F) but maintains a similar average of 23°C (73°F) and a maximum of 31°C (89°F). October's humidity is slightly higher at 78%, and it experiences just one more rainy day, with total precipitation also reaching 88 mm (3.5 in). For a detailed forecast, check out Hilton Head Island weather in October.

May and November exhibit contrasting weather patterns, reflecting the transition from spring to late autumn. In May, temperatures range from a minimum of 12°C (53°F) to a maximum of 34°C (94°F), with an average of 23°C (74°F). The month experiences relatively high humidity at 75% and about 89 mm of precipitation over 10 days. In contrast, November sees cooler temperatures, with a minimum of 1°C (35°F), an average of 16°C (61°F), and a maximum of 28°C (82°F). The humidity increases slightly to 85%, while precipitation remains similar at 90 mm but occurs over only 8 days. For more details on November weather, visit Hilton Head Island weather in November.

Comparing the weather between May and December reveals notable differences in temperature and conditions. May boasts warmer temperatures, with averages ranging from a mild 12°C (53°F) at night to a high of 34°C (94°F) during the day, accompanied by substantial humidity at 75%. In contrast, December sees much cooler temperatures, with a low of -1°C (30°F) and an average of 13°C (55°F), making it significantly chillier. While both months experience precipitation on about 10 days, December has higher rainfall at 125 mm (4.9 in) compared to May's 89 mm (3.5 in). This increase in moisture comes alongside a higher humidity level of 87% during the winter month, creating a different atmospheric feel. For more detailed insights, you can check out Hilton Head Island weather in December.

Compare Hilton Head Island's Climate with Cities Worldwide

Conclusion: What to Expect From May Weather in Hilton Head Island

As May unfolds on Hilton Head Island, the weather showcases a delightful shift that sets the stage for the summer months ahead. With warmer temperatures and an average that leans comfortably into the mid-20s Celsius (around 74°F), this month enjoys a vibrant blend of warmth and sunshine. While the occasional tropical shower may make an appearance, contributing to the almost 90 mm of rainfall over approximately ten days, the island remains inviting with a balmy humidity that often enhances the feeling of summer. This pleasant climate contrasts sharply with the cooler, drier conditions of the preceding months, making May an ideal time for outdoor adventures and exploration. For a deeper dive into what to expect throughout the year, check out Hilton Head Island Climate.