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September Weather in Darby, United States

Last updated: June 24, 2025

In September, the average temperature in Darby, United States hovers around 11°C (52°F). Expect a range from a chilly -8°C (18°F) to a warm 31°C (88°F). Additionally, you can anticipate 45 mm (1.8 in) of precipitation over about 7 days, with an average humidity of 66%.

September Temperature in Darby

In September in Darby, the average temperature is 11°C (52°F). Maximum temperatures can reach up to 31°C (88°F), while minimum temperatures can drop as low as -8°C (18°F). Be prepared for significant temperature fluctuations during your travels.

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

The chart illustrates September temperature patterns in Darby, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Darby, September typically has an average temperature of 11°C (52°F), with highs reaching up to 31°C (88°F) and lows dropping to around -8°C (18°F).
JanFebMarAprMayJunJulAugSepOctNovDec202130344254646252362619
Data source: Temperature data for Darby 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 Darby

In Darby in September, the precipitation amount is 45 mm (1.8 in) spread over a duration of 7 days.

September Precipitation Trends in Darby

The chart displays monthly precipitation patterns in Darby, 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 Darby, September typically receives around 45 mm (1.8 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec6212282827287292945757482
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Darby

In Darby in September humidity is 66%. With an average temperature of 11°C (52°F), this humidity feels like a cool, crisp embrace, making traveling an invigorating experience, yet travelers should be prepared for a slight chill in the air that can be refreshing during explorations.

September Average Humidity in Darby

This chart illustrates the average monthly humidity levels in Darby, 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 Darby is approximately 66%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec94%93%91%87%83%80%75%66%66%77%92%96%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Darby

In Darby 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 Darby.

Maximum UV Index Levels in Darby for September

The chart shows the monthly maximum UV Index (UVI) for Darby 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 Darby typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec347811111198532
Data source: Darby 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 Darby Compares to Other Months

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

This table compares monthly weather conditions in Darby, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-7°C (20°F)62 mm (2.4 inches)94%moderate
February Weather-6°C (21°F)122 mm (4.8 inches)93%moderate
March Weather-1°C (30°F)82 mm (3.2 inches)91%high
April Weather1°C (34°F)82 mm (3.2 inches)87%very high
May Weather6°C (43°F)72 mm (2.8 inches)83%extreme
June Weather12°C (54°F)87 mm (3.4 inches)80%extreme
July Weather18°C (64°F)29 mm (1.1 inches)75%extreme
August Weather17°C (62°F)29 mm (1.1 inches)66%very high
September Weather11°C (52°F)45 mm (1.8 inches)66%very high
October Weather2°C (37°F)75 mm (3.0 inches)77%moderate
November Weather-3°C (27°F)74 mm (2.9 inches)91%moderate
December Weather-7°C (19°F)82 mm (3.2 inches)96%low

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