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September Weather in Wilmington, United States

Last updated: June 24, 2025

In Wilmington, United States, the average temperature in September hovers around 15°C (60°F). Expect a temperature range that can dip to a chilly -1°C (31°F) or soar up to a warm 31°C (89°F). During this month, precipitation amounts to approximately 67 mm (2.7 in) over about 10 days, contributing to an average humidity of 78%. Enjoy the dynamic weather of Wilmington!

September Temperature in Wilmington

In September in Wilmington, the average temperature is 15°C (60°F), with maximums reaching 31°C (89°F) and minimums dropping as low as -1°C (31°F). This range makes it a great time for travelers to enjoy both warm and cooler activities.

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

The chart illustrates September temperature patterns in Wilmington, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Wilmington, September typically has an average temperature of 15°C (60°F), with highs reaching up to 31°C (89°F) and lows dropping to around -1°C (31°F).
JanFebMarAprMayJunJulAugSepOctNovDec182128415463696759483424
Data source: Temperature data for 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 Wilmington

In Wilmington in September, the precipitation amount is 67 mm (2.7 in) over a span of 10 days.

September Precipitation Trends in Wilmington

The chart displays monthly precipitation patterns in 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 Wilmington, September typically receives around 67 mm (2.7 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec81837811396105115976714310378
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Wilmington

In Wilmington in September, humidity is 78%. With an average temperature of 15°C (60°F), this humidity feels like a warm, damp embrace that can make outdoor activities a bit uncomfortable, highlighting the importance of staying hydrated and taking breaks in the shade while exploring.

September Average Humidity in Wilmington

This chart illustrates the average monthly humidity levels in 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 Wilmington is approximately 78%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec93%92%86%85%80%74%76%75%78%86%89%89%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Wilmington

In Wilmington in September, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in Wilmington.

Maximum UV Index Levels in Wilmington for September

The chart shows the monthly maximum UV Index (UVI) for 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 Wilmington typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2458910997532
Data source: 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 Wilmington Compares to Other Months

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

This table compares monthly weather conditions in Wilmington, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-8°C (19°F)81 mm (3.2 inches)93%low
February Weather-6°C (21°F)83 mm (3.3 inches)92%moderate
March Weather-2°C (28°F)78 mm (3.1 inches)86%moderate
April Weather5°C (41°F)113 mm (4.4 inches)85%very high
May Weather12°C (55°F)96 mm (3.8 inches)80%very high
June Weather17°C (63°F)105 mm (4.1 inches)74%very high
July Weather21°C (69°F)115 mm (4.5 inches)76%very high
August Weather19°C (67°F)97 mm (3.8 inches)75%very high
September Weather15°C (60°F)67 mm (2.7 inches)78%high
October Weather9°C (48°F)143 mm (5.6 inches)86%moderate
November Weather1°C (34°F)102 mm (4.0 inches)88%moderate
December Weather-4°C (25°F)78 mm (3.1 inches)89%low

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