September Weather in Hilton Head Island, United States

Last updated: February 24, 2025

September in Hilton Head Island showcases a tropical blend of warmth and humidity, ideal for beach escapades and outdoor fun. With peak temperatures reaching 34°C (93°F) and an average of 26°C (79°F), the days invite sun-seekers to bask in its glow. However, the minimum night temperature can dip to a cooler 16°C (61°F). This month also brings its share of rain, with 127 mm (5.0 inches) of precipitation spread over approximately 15 days, contributing to an overall humidity level of 83%. Whether you're savoring the late summer sun or seeking refuge from the occasional downpour, September offers a dynamic weather experience for all visitors.

September Temperature in Hilton Head Island

September on Hilton Head Island marks a transitional phase in temperatures, as the summer heat begins to wane. With minimums averaging around 16°C (61°F), the island still enjoys warm days, while average temperatures reach a comfortable 26°C (79°F). The maximum temperatures can soar up to 34°C (93°F), reminiscent of the peak summer days just passed. This month strikes a splendid balance between lingering warmth and the early hints of fall, making it an appealing time for beachgoers and outdoor enthusiasts alike. As the days shorten and cooler evenings set in, September encapsulates the best of both worlds—ideal for savoring the last moments of summer without the oppressive heat.

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

The chart illustrates September 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.

September Precipitation in Hilton Head Island

September in Hilton Head Island sees a notable shift in precipitation, with 127 mm (5.0 in) of rain falling over 15 days. This month continues the trend of increased rainfall observed during the summer, which peaks in August at 180 mm (7.1 in). As the summer heat begins to wane, September retains a significant amount of moisture, though it marks a slight decline compared to the previous month. The frequent rain showers common in September contribute to the lush landscapes of the island, making it a vibrant time for nature enthusiasts. Overall, while the amount of rainfall is substantial, it offers a refreshing transition into the fall season, paving the way for a delightful and greener environment.

September Precipitation Trends in Hilton Head Island

The chart displays monthly precipitation patterns in Hilton Head Island, with values for each month alongside September's data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September's conditions compare to those of other months.
JanFebMarAprMayJunJulAugSepOctNovDec62806885891221561801278890125
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Hilton Head Island

As September arrives on Hilton Head Island, the humidity settles at a comfortable 83%, offering a slight increase from the preceding months of summer. This uptick follows the typical trend of humidity levels that peak during the warmer months, with July and August hovering around 80% to 81%. Interestingly, as fall approaches, humidity levels gradually decline, with October’s average dropping to 78%. The overall yearly pattern reflects a humid coastal climate, where January and December boast the highest humidity, reaching 86% and 87% respectively, while late spring and early summer see the lowest figures. This seasonal ebb and flow create an inviting atmosphere throughout the year, making Hilton Head Island a desirable retreat for beachgoers and nature lovers alike.

September Average Humidity in Hilton Head Island

This chart illustrates the average monthly humidity levels in Hilton Head Island, with September's data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, allowing you to see how September's humidity levels compare to other months.
JanFebMarAprMayJunJulAugSepOctNovDec86%81%81%79%75%75%80%81%83%78%85%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Hilton Head Island

In September, Hilton Head Island experiences a UV Index of 10, categorizing it as very high exposure, requiring vigilance for sun protection. This trend showcases a steady drop from the peak extreme levels observed during the summer months, but the need for caution remains, with a burn time of just 15 minutes. As the transition to fall begins, the UV levels are still significant, echoing the patterns from the previous months that urged residents and visitors alike to prioritize sun safety. Be sure to stay informed about daily changes in UV exposure while enjoying the beautiful sunshine. For detailed insights, check out the Hilton Head Island UV Index.

Maximum UV Index Levels in Hilton Head Island for September

The chart shows the monthly maximum UV Index (UVI) for Hilton Head Island in September, 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 September 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.

September Sunshine in Hilton Head Island

September in Hilton Head Island is a delightful transition month, showcasing 304 hours of sunshine that reflects the lingering warmth of summer while gently ushering in the crispness of fall. This month maintains a vibrant glow, sitting just below the peak of July's 347 hours, yet signifies a subtle decrease from the sun-soaked days of summer. The consistent sunshine from May through September highlights the region's long summer stretch, with September offering a perfect blend of warmth and outdoor enjoyment without the full-on heat of mid-summer. As the days shorten and the temperatures start to cool, September still invites visitors to bask in its abundant sunshine, making it an ideal time for beach lovers and nature enthusiasts alike.

Monthly Sunshine Duration in Hilton Head Island: September Highlighted

The September sunshine duration represents the total number of hours Hilton Head Island experiences direct sunlight during the month of September, excluding cloudy or obstructed periods. This chart compares the sunshine duration of September with the other months of the year.
JanFebMarAprMayJunJulAugSepOctNovDec192h214h282h309h338h321h347h318h304h294h253h218h
Data source: Hilton Head Island September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Hilton Head Island During September

September in Hilton Head Island sees a promising 51% chance of sunny weather, making it one of the more favorable months for sun seekers. Following the typically wet and overcast summer, where July and August drop to a mere 31% and 27% chance of sunny days, September marks a transition towards brighter days. The likelihood of clear skies slightly increases as the month rolls into fall, aligning closely with October's 52% and even surpassing the spring months, which see variable sunshine probabilities. As visitors flock to the island, they can look forward to enjoying the tail end of summer's warmth with an optimistic forecast for sun-soaked adventures.

Percentage of Sunny Days in September in Hilton Head Island

The chart illustrates the percentage of sunny days in Hilton Head Island throughout the year, with September 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 September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Hilton Head Island in September

As summer transitions into autumn, September in Hilton Head Island brings a gentle decline in daylight, averaging 12 hours—a shift that mirrors the gradual shortening of days experienced throughout the year. Having basked in the peak of 14 hours of sunlight in June, residents and visitors now enjoy the lingering warmth of summer while preparing for the cooler months ahead. This month marks a significant point of balance as daylight returns to levels reminiscent of the spring months, hinting at nature's cyclical rhythm. The gradual fade from 13 hours in August encourages a more contemplative atmosphere, perfect for savoring the last days of the season's vibrancy before shorter days take hold.

Average Daylight Hours in Hilton Head Island for September

The chart illustrates the variation in daylight duration in Hilton Head Island throughout the year, with September 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.

September Winds in Hilton Head Island

As September rolls into Hilton Head Island, a subtle shift in the breeze is palpable, with average wind speeds dipping to 3.2 m/s (7 mph). This marks a gradual decline from the summer months, where winds hovered around 3.4 m/s (8 mph) in August. The trend reflects the island's transition into autumn, as the gentle winds create a serene atmosphere perfect for leisurely beach walks and outdoor activities. Interestingly, the year reaches its peak windiness in March and May, both at 4.4 m/s (10 mph), providing a stark contrast to the more tranquil conditions of September. This seasonal rhythm evokes the island's charm, where each month offers its unique character shaped by the winds that softly dance through coastal landscapes.

Average September Wind Speed in Hilton Head Island

The chart displays monthly wind speed patterns in Hilton Head Island, with values for each month shown alongside September's data, which is highlighted for easy comparison. It illustrates the average wind speed, offering insights into how September's wind conditions compare to the rest of the year.
JanFebMarAprMayJunJulAugSepOctNovDec4.34.24.44.34.44.13.63.43.2 m/s3.54.03.8
Data source: Hilton Head Island September wind data, generated using information from the Copernicus Climate Change Service.

How September 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 September'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.

September and January present a stark contrast in weather conditions. In September, the temperatures range from a minimum of 16°C (61°F) to a maximum of 34°C (93°F), resulting in warm, humid days with an average temperature of 26°C (79°F). This month also experiences considerable rainfall, with 127 mm (5.0 in) of precipitation over 15 days. In contrast, January offers much cooler weather, with temperatures dipping to a minimum of -5°C (23°F) at night and reaching a comfortable average of 11°C (53°F) during the day, peaking at 24°C (75°F). With only 61 mm (2.4 in) of precipitation over just 7 days and slightly higher humidity at 86%, January provides a drier and crisper atmosphere. For more details about January weather, you can check out this link: Hilton Head Island weather in January.

September weather features warmer temperatures with a minimum of 16°C (61°F) and an average high of 34°C (93°F), making it a hot month, while February is significantly cooler with a minimum of 1°C (33°F) and a maximum of 25°C (77°F). In terms of precipitation, September experiences more rain, averaging 127 mm (5.0 in) over about 15 days, compared to February's 80 mm (3.1 in) over 11 days. Both months exhibit high humidity levels, with September slightly higher at 83% compared to February's 81%. For a more detailed overview of February weather, you can visit Hilton Head Island weather in February.

September and March present distinctly different weather patterns. In September, temperatures range from a minimum of 16°C (61°F) to a maximum of 34°C (93°F), with an average temperature of 26°C (79°F). This month also sees significant precipitation, totaling 127 mm (5.0 in) over approximately 15 days, and the humidity remains high at 83%. In contrast, March experiences cooler temperatures, with a minimum of 1°C (34°F) and a maximum of 27°C (81°F), averaging 16°C (61°F). Precipitation is notably lower in March at 68 mm (2.7 in) across just 6 days, and humidity levels drop slightly to 81%. For more details, you can visit Hilton Head Island weather in March.

In comparing the weather of September and April, there is a notable difference in temperature and precipitation. September boasts a warmer climate with average temperatures reaching 26°C (79°F) and highs soaring to 34°C (93°F), while April experiences cooler conditions with average temperatures around 19°C (67°F) and a maximum of 30°C (87°F). Additionally, September is characterized by higher humidity at 83% and more frequent rain, totaling 127 mm (5.0 in) over 15 days, compared to April's 85 mm (3.4 in) over just 8 days. For a more detailed look at April weather, check out Hilton Head Island weather in April.

When comparing the weather in September and May, it becomes clear that September tends to be warmer overall, with average temperatures reaching 26°C (79°F), compared to May's 23°C (74°F). Both months experience high maximum temperatures, with May peaking at 34°C (94°F) and September at a similar 34°C (93°F). However, September is significantly wetter, receiving 127 mm (5.0 in) of precipitation over 15 days, while May sees less rain at 89 mm (3.5 in) across just 10 days. Humidity levels are also higher in September at 83%, compared to May's 75%. For more detailed insights about May weather specifically, you can check this link: Hilton Head Island weather in May.

In comparing the weather between September and June, both months exhibit similar average temperatures, hovering around 26°C (79°F), with maximums reaching up to 34°C (93°F). However, September tends to be slightly more humid, with an average humidity of 83% compared to June's 75%. Precipitation levels are quite comparable as well, with September experiencing 127 mm over 15 days, while June sees 122 mm across 18 days. For a more detailed look at weather conditions in June, you can check this link: Hilton Head Island weather in June.

When comparing the weather in September to that of July, September presents a slightly cooler and more humid climate. The average temperature in September is 26°C (79°F), with highs reaching up to 34°C (93°F), while July experiences a warmer average of 28°C (82°F) and peaks at 35°C (95°F). Additionally, September sees more rainfall, totaling 127 mm (5.0 in) over 15 days, compared to July's 156 mm (6.1 in) across 19 days. Despite the higher total rainfall in July, September has a higher humidity level at 83%, reflecting the transition into autumn. For a closer look at July's weather, visit Hilton Head Island weather in July.

In August, the weather tends to be warmer with average temperatures around 27°C (82°F) and a minimum of 22°C (73°F), while September offers slightly cooler temperatures, averaging 26°C (79°F) with a minimum of 16°C (61°F). Although both months experience high temperatures peaking at 34°C (93°F in September and 94°F in August), September sees a notable decrease in precipitation, receiving 127 mm (5.0 in) over 15 days compared to August's 180 mm (7.1 in) over 22 days. Humidity levels are also comparable, with September at 83% and August at 81%. For more detailed information, you can check Hilton Head Island weather in August.

September typically boasts warmer temperatures with minimums around 16°C (61°F) and maximums reaching up to 34°C (93°F), while October sees a noticeable drop in the minimum temperature to 6°C (42°F) and a slight decrease in the maximum to 31°C (89°F). The average temperature in September is 26°C (79°F), compared to 23°C (73°F) in October, indicating a shift towards cooler autumn days. Additionally, September experiences more rainfall, with 127 mm (5.0 in) over 15 days, while October has a reduced precipitation level of 88 mm (3.5 in) across 11 days. Despite the drop in temperatures and humidity from 83% in September to 78% in October, both months still offer enjoyable weather. For more detailed insights, check out Hilton Head Island weather in October.

In September, the weather tends to be warm and humid, with average temperatures around 26°C (79°F) and peak highs reaching as much as 34°C (93°F). The month is also characterized by frequent rain, experiencing precipitation on 15 days and totaling 127 mm (5.0 in). In contrast, November brings a significant drop in temperatures, with an average of 16°C (61°F) and highs of 28°C (82°F), while the minimum temperature can dip to a chilly 1°C (35°F). Rainfall decreases as well, with only 90 mm (3.5 in) over 8 days, and humidity remains relatively high at 85%. For more details on weather conditions during this month, you can visit Hilton Head Island weather in November.

September and December present quite contrasting weather patterns. In September, temperatures range from a minimum of 16°C (61°F) to a sweltering maximum of 34°C (93°F), with an average of 26°C (79°F). The month experiences significant rainfall, accumulating 127 mm (5.0 in) over 15 days, alongside high humidity levels of 83%. Conversely, December sees much cooler temperatures, with a minimum of -1°C (30°F) and a maximum of 23°C (73°F), averaging at 13°C (55°F). Precipitation is slightly lower at 125 mm (4.9 in) over 10 days, while humidity remains high at 87%. For more details, you can check Hilton Head Island weather in December.

Compare Hilton Head Island's Climate with Cities Worldwide

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

As September arrives on Hilton Head Island, it brings a blend of summer warmth and the initial signs of fall. Visitors can expect balmy temperatures, with days reaching up to a sizzling 34°C (93°F), while nights cool down pleasantly. This month stands out with increased precipitation, as rain showers grace the island approximately half the time, adding a refreshing touch to the sultry atmosphere. The humidity remains elevated, contributing to that quintessential coastal feel. Overall, September serves as a transitional phase, where the vibrant summer energy starts to soften, making it a unique time to enjoy the island's beauty. For more insights on how September fits into the broader picture of weather patterns, explore Hilton Head Island Climate.