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September Weather in South Wilmington, United States

Last updated: June 24, 2025

In South Wilmington, United States, the average temperature in September hovers around 20°C (69°F). However, it's not unusual to experience a minimum of 4°C (39°F) and a maximum of 35°C (95°F) during this time. Expect around 84 mm (3.3 in) of precipitation over 9 days, accompanied by an average humidity of 80%. Enjoy the dynamic climate!

September Temperature in South Wilmington

In September in South Wilmington, the average temperature is 20°C (69°F), with maximums reaching up to 35°C (95°F) and minimums dropping as low as 4°C (39°F). This climate makes South Wilmington an ideal destination for travelers seeking a pleasant mix of warmth and cooler evenings.

September Weather in South Wilmington: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in South Wilmington, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In South Wilmington, September typically has an average temperature of 20°C (69°F), with highs reaching up to 35°C (95°F) and lows dropping to around 4°C (39°F).
JanFebMarAprMayJunJulAugSepOctNovDec272841506373767469554034
Data source: Temperature data for South Wilmington 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 South Wilmington

In South Wilmington in September, the precipitation amount is 84 mm (3.3 in) spread over 9 days.

September Precipitation Trends in South Wilmington

The chart displays monthly precipitation patterns in South Wilmington, 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. In South Wilmington, September typically receives around 84 mm (3.3 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec65689312116413510084841385956
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in South Wilmington

In South Wilmington in September, humidity is 80%. With an average temperature of 20°C (69°F), this humidity feels like a warm blanket enveloping you, making every step slightly more challenging as you navigate the air that clings to your skin, often leaving you longing for a cool breeze while exploring the sights.

September Average Humidity in South Wilmington

This chart illustrates the average monthly humidity levels in South Wilmington, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in South Wilmington is approximately 80%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec82%83%84%85%79%82%80%81%80%82%88%84%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in South Wilmington

In South Wilmington in September, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in South Wilmington.

Maximum UV Index Levels in South Wilmington for September

The chart shows the monthly maximum UV Index (UVI) for South Wilmington 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. In September, the maximum UV index in South Wilmington typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec35689101098642
Data source: South Wilmington 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.

How September Weather in South Wilmington Compares to Other Months

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

This table compares monthly weather conditions in South Wilmington, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-3°C (27°F)65 mm (2.6 inches)82%moderate
February Weather-2°C (29°F)68 mm (2.7 inches)83%moderate
March Weather5°C (41°F)93 mm (3.6 inches)84%high
April Weather10°C (50°F)121 mm (4.8 inches)85%very high
May Weather17°C (63°F)164 mm (6.4 inches)79%very high
June Weather23°C (73°F)135 mm (5.3 inches)82%very high
July Weather24°C (76°F)100 mm (4.0 inches)80%very high
August Weather23°C (74°F)84 mm (3.3 inches)81%very high
September Weather20°C (69°F)84 mm (3.3 inches)80%very high
October Weather13°C (56°F)138 mm (5.4 inches)82%high
November Weather4°C (40°F)59 mm (2.3 inches)88%moderate
December Weather1°C (34°F)56 mm (2.2 inches)84%low

Compare South Wilmington's Climate with Cities Worldwide