September Weather in Myrtle Beach, United States

Last updated: February 24, 2025

In September, Myrtle Beach experiences a warm and inviting climate, with maximum temperatures soaring to 34°C (93°F) and an average of 25°C (77°F), providing ideal conditions for beachgoers. Cooler nights can bring temperatures down to a pleasant 12°C (54°F). However, be prepared for some rain, as 178 mm (7.0 in) of precipitation falls over approximately 12 days during the month. The high humidity level at 81% adds a touch of tropical feel, making this coastal destination a vibrant mix of summer warmth and refreshing ocean breezes.

September Temperature in Myrtle Beach

As September rolls in, Myrtle Beach enjoys a delightful transition from the summer heat, showcasing mild temperatures perfect for beach activities. With minimums around 12°C (54°F) and average daytime highs reaching a comfortable 25°C (77°F), visitors can still soak in the sun without the sweltering intensity of August. The maximum temperature, peaking at a warm 34°C (93°F), offers a pleasant end to the summer season. As days gradually shorten and temperatures cool, September is an ideal month for enjoying the last of summer's warmth while immersing in the vibrant coastal charm of this beloved vacation spot.

September Weather in Myrtle Beach: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Myrtle Beach, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec495457657378818077705752
Data source: Temperature data for Myrtle Beach 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 Myrtle Beach

September in Myrtle Beach brings a notable shift in weather patterns as it transitions from the summer months. With an average precipitation of 178 mm (7.0 in) over 12 days, the rainfall marks a decrease from the previous month but remains significant enough to hint at the lingering influence of late summer storms. The dwindling number of precipitation days compared to the record 22 days in August suggests a gradual tapering off of summer’s intensity, yet the total rainfall still showcases the region's tendency for late-season showers. As the area moves into the fall, Myrtle Beach typically experiences a mix of clearer skies and refreshing rain, setting the stage for a beautiful coastal autumn.

September Precipitation Trends in Myrtle Beach

The chart displays monthly precipitation patterns in Myrtle Beach, 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.
JanFebMarAprMayJunJulAugSepOctNovDec668771941221571792131786186130
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Myrtle Beach

In September, Myrtle Beach experiences a comfortable humidity level of 81%, which aligns closely with the trends observed during the previous summer months. This slight dip from the peak humidity of 82% in July provides a welcome transition into fall, as the beach town begins to cool slightly. Interestingly, humidity levels remain relatively stable throughout the year, averaging between 78% to 84%, with the tail end of summer and the start of fall showcasing a tendency for slightly higher moisture before temperatures drop in October. This consistency in humidity creates a pleasant, tropical feel ideal for visitors looking to enjoy the beach, making September a prime time for those seeking to soak up the sun without the intense heat of the peak summer months.

September Average Humidity in Myrtle Beach

This chart illustrates the average monthly humidity levels in Myrtle Beach, 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.
JanFebMarAprMayJunJulAugSepOctNovDec84%80%79%78%78%78%82%81%81%78%82%84%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Myrtle Beach

As September rolls into Myrtle Beach, the UV Index reflects a notable trend, dipping to 9, categorizing it as very high and requiring careful sun exposure management. After the extreme levels of 11 observed throughout the peak summer months, the slight decrease offers a brief respite, yet 15 minutes of unprotected sun can still lead to burns. This transition signals the importance of remaining vigilant as summer gives way to fall, ensuring skin protection measures remain a priority. For more information on sun safety and updated UV readings, check out the Myrtle Beach UV Index.

Maximum UV Index Levels in Myrtle Beach for September

The chart shows the monthly maximum UV Index (UVI) for Myrtle Beach 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.
JanFebMarAprMayJunJulAugSepOctNovDec47810111111119864
Data source: Myrtle Beach 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 Myrtle Beach

As summer fades, September continues to bask in Myrtle Beach's golden glow, delivering an impressive 301 hours of sunshine. While slightly less than the peak of July's 343 hours, this month maintains a delightful warmth that is perfect for beachgoers. August also mirrors this trend with 320 hours of sunlight, indicating that the late summer sun lingers a bit longer before falling sharply in fall. The gradual decrease as the year moves towards October’s 292 hours suggests that although summer is coming to a close, there's still plenty of opportunity to soak up the rays and enjoy the Atlantic coast's charm during this beautiful transitional period.

Monthly Sunshine Duration in Myrtle Beach: September Highlighted

The September sunshine duration represents the total number of hours Myrtle Beach 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.
JanFebMarAprMayJunJulAugSepOctNovDec186h210h273h309h337h319h343h320h301h292h247h216h
Data source: Myrtle Beach September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Myrtle Beach During September

In September, Myrtle Beach enjoys a relatively sunny disposition with a 53% chance of clear skies, marking a transitional shift following the summer months. While the summer typically brings lower probabilities of sunshine, such as 31% in June and 39% in July, September provides a welcome increase, hinting at the lingering warmth of summer. This uptick in sunshine can be a delightful surprise as visitors flock to the beach, taking advantage of the milder temperatures and clearer days before the arrival of autumn. Notably, as the year progresses, September stands out as a favorable month for those seeking sun, especially when compared to the sunnier autumn months like November with a 62% chance, thereby setting a pleasant tone as the seasons change.

Percentage of Sunny Days in September in Myrtle Beach

The chart illustrates the percentage of sunny days in Myrtle Beach 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 Myrtle Beach experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec48%37%37%59%49%32%39%35%53%47%62%47%
Data source: Myrtle Beach September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Myrtle Beach in September

As summer wanes and September unfolds in Myrtle Beach, the daylight duration settles at a comfortable 12 hours. This marks a gentle decline from the peak of 14 hours experienced in June and July, reflecting the gradual transition into fall. August's daylight remains robust at 13 hours, bridging the vibrant energy of summer with the softer light of early autumn. The trend showcases a consistent tapering as the year progresses, with each month leading to shorter days, culminating in the 9 hours of daylight typical in December. This rhythmic ebb and flow of sunlight not only sets the stage for changing seasons but also enhances the charm of Myrtle Beach, inviting residents and visitors alike to savor the warm days before the coolness of fall sets in.

Average Daylight Hours in Myrtle Beach for September

The chart illustrates the variation in daylight duration in Myrtle Beach throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec10h 10m10h 58m11h 59m13h 2m13h 55m14h 21m14h 7m13h 20m12h 20m11h 17m10h 23m9h 55m
Data source: Myrtle Beach daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Myrtle Beach

As summer wanes and September arrives in Myrtle Beach, the average wind speed gently shifts to 2.8 m/s (6 mph), reflecting a slight increase from the calmest month of August. This transition marks a subtle shift in the coastal atmosphere, as the winds begin to pick up again in the months leading to autumn. Notably, September's breezes are softer compared to the earlier parts of the year, which typically enjoy stronger gusts in the spring and early summer. Nevertheless, as temperatures begin to cool and the vacation crowds dwindle, the mild winds offer a perfect backdrop for serene beach walks and pleasant evenings by the shore, inviting both relaxation and reflection on the seasonal changes ahead.

Average September Wind Speed in Myrtle Beach

The chart displays monthly wind speed patterns in Myrtle Beach, 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.
JanFebMarAprMayJunJulAugSepOctNovDec3.63.73.93.73.53.43.02.52.8 m/s3.23.63.4
Data source: Myrtle Beach September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Myrtle Beach Compares to Other Months

The weather in Myrtle Beach 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 Myrtle Beach and find detailed weather information for every month.

In September, the weather is warm and humid, with temperatures ranging from a minimum of 12°C (54°F) to a maximum of 34°C (93°F), and an average temperature of 25°C (77°F). The month sees significant rainfall, averaging 178 mm (7.0 in) over about 12 days, creating a lush environment. In contrast, January offers a much cooler climate, with temperatures dropping to a minimum of -9°C (15°F) and peaking at 25°C (77°F), all while averaging around 10°C (50°F). Precipitation is lighter during this month, totaling 66 mm (2.6 in) over approximately 8 days, with humidity slightly higher at 83%. For more detailed insights, check out Myrtle Beach weather in January.

September and February exhibit stark contrasts in weather conditions. In September, temperatures range from a mild 12°C (54°F) at night to a scorching maximum of 34°C (93°F), with an average of 25°C (77°F). This month experiences considerable rainfall, totaling 178 mm (7.0 in) over approximately 12 days, and boasts high humidity levels at 81%. In contrast, February presents a much cooler profile, with temperatures dipping as low as -3°C (27°F) and peaking at 26°C (79°F), averaging around 12°C (54°F). Precipitation is less frequent, with 87 mm (3.4 in) falling over just 9 days and humidity slightly lower at 79%. For those interested in the specifics of February weather, you can check out Myrtle Beach weather in February.

September and March present stark contrasts in weather patterns. In September, temperatures range from a minimum of 12°C (54°F) to a maximum of 34°C (93°F), with an average of 25°C (77°F) and high humidity at 81%. The month also sees significant rainfall, totaling 178 mm (7.0 in) over approximately 12 days. Conversely, March experiences a cooler climate, with temperatures ranging from a chilling -3°C (27°F) to a comfortable 28°C (83°F) and averaging 14°C (58°F). This month is much drier, with only 71 mm (2.8 in) of precipitation over 8 days, and a slightly lower humidity of 79%. For a closer look into March weather, check out Myrtle Beach weather in March.

When comparing the weather in September and April, you'll notice significant differences in temperature and precipitation. September tends to be warmer, with average temperatures ranging from a minimum of 12°C (54°F) to a maximum of 34°C (93°F), while April has a cooler average, with temperatures from 2°C (35°F) to 29°C (85°F). Additionally, September experiences more precipitation, with 178 mm (7.0 in) over 12 days, compared to April's 94 mm (3.7 in) over 8 days. Humidity levels are slightly higher in September at 81% compared to 78% in April. For a closer look at the specifics, check out Myrtle Beach weather in April.

In comparing the weather between September and May, September tends to be warmer with average temperatures reaching 25°C (77°F) and maximums hitting 34°C (93°F), whereas May has a slightly cooler average of 23°C (73°F) and can peak at 36°C (97°F). September experiences higher humidity at 81%, compared to May's more comfortable 78%. Rainfall is also more prevalent in September, with 178 mm (7.0 in) over 12 days, while May sees less precipitation at 122 mm (4.8 in) across 10 days. For more specific information, you can check out Myrtle Beach weather in May.

In comparing the weather of September and June, both months exhibit similar average temperatures, hovering around 25°C (78°F), but September typically experiences slightly cooler minimum temperatures at 12°C (54°F) compared to June's 14°C (57°F). While maximum temperatures peak at similar highs of 34°C (93°F in September and 94°F in June), September tends to be more humid, with humidity levels at 81% compared to June's 78%. Precipitation is more frequent in September, with about 178 mm falling over 12 days, whereas June sees less rain overall at 156 mm over 17 days. For more detailed insights on June weather specifically, check out Myrtle Beach weather in June.

When comparing the weather in July and September, we see some notable differences. July tends to be warmer, with minimum temperatures averaging around 18°C (65°F) compared to September's cooler minimum of 12°C (54°F). Both months experience maximum temperatures that peak at 34°C (93°F), but September provides a bit more variability with an average temperature of 25°C (77°F), slightly lower than July’s 27°C (81°F).

Precipitation levels are comparable, with July receiving 179 mm over 18 days and September seeing slightly less at 178 mm over 12 days, indicating that September is typically wetter but over fewer days. Humidity also remains high in both months, with September at 81% and July slightly higher at 82%. For more information about July's weather, you can explore this link: Myrtle Beach weather in July.

When comparing the weather in September to that of August, September exhibits cooler minimum temperatures, averaging 12°C (54°F), compared to August's warmer 19°C (66°F). While both months share a maximum temperature of 34°C (93°F), September has a slightly lower average temperature of 25°C (77°F) compared to August's 27°C (80°F). Additionally, September experiences more rainy days with 12 days of precipitation, resulting in a total of 178 mm (7.0 in), whereas August sees 22 days of rain and 212 mm (8.4 in) of precipitation. Despite the differences, both months maintain a consistent humidity level of 81%. For more details on August weather, you can check Myrtle Beach weather in August.

September and October exhibit distinct differences in weather patterns. In September, temperatures typically range from a minimum of 12°C (54°F) to a maximum of 34°C (93°F), with an average of 25°C (77°F). The month is characterized by high humidity at 81% and considerable precipitation, averaging 178 mm (7.0 in) over 12 days. In contrast, October sees cooler temperatures, with a minimum of 4°C (40°F), an average of 21°C (70°F), and a maximum of 33°C (92°F). Precipitation decreases significantly to 61 mm (2.4 in) over 8 days, and humidity lowers slightly to 78%. For more detailed insights on the October weather, check out Myrtle Beach weather in October.

September and November present contrasting weather patterns. In September, temperatures are warmer, ranging from a minimum of 12°C (54°F) to a maximum of 34°C (93°F), with an average of 25°C (77°F). The month sees significant rainfall, accumulating 178 mm (7.0 in) over about 12 days, accompanied by high humidity levels of 81%. In contrast, November brings much cooler temperatures, with a minimum of 0°C (32°F) and a maximum of 27°C (82°F), averaging at 14°C (57°F). Rainfall decreases to 86 mm (3.4 in) over 10 days, while humidity remains slightly higher at 82%. For more details on what to expect, you can check Myrtle Beach weather in November.

In September, the weather is generally warm, with temperatures ranging from a mild 12°C (54°F) at night to a high of 34°C (93°F) during the day, and an average temperature of 25°C (77°F). The month is quite rainy, receiving 178 mm (7.0 in) of precipitation over 12 days and featuring high humidity at 81%. In contrast, December brings much cooler conditions, with nighttime lows plummeting to -4°C (25°F) and daytime highs peaking at 24°C (76°F), resulting in an average temperature of 11°C (52°F). Although December experiences less rainfall—130 mm (5.1 in) over 9 days—humidity remains relatively high at 84%, creating a chillier atmosphere. For more detailed insights, you can check this link: Myrtle Beach weather in December.

Compare Myrtle Beach's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Myrtle Beach

As September rolls into Myrtle Beach, the summer's sweltering grip begins to loosen, offering a pleasant average temperature that's perfect for outdoor activities. While the maximum heat can still peak at a warm 34°C, visitors can also enjoy cooler nights with temperatures dipping to around 12°C. This month marks a shift towards increased precipitation, with rain falling on about 12 days, contributing to the region's lush scenery. The humidity remains high, but the overall feel is refreshing compared to the peak summer months. For those looking to explore the unique climate of Myrtle Beach in September, please refer to Myrtle Beach Climate for more insights.