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September Weather in South Dayton, United States

Last updated: June 24, 2025

In September, the average temperature in South Dayton, United States hovers around 17°C (62°F). However, temperatures can vary significantly, dipping to a chilly 2°C (35°F) at night and soaring to a warm 30°C (87°F) during the day. Be prepared for some rain, as 88 mm (3.5 in) of precipitation can be expected over 11 days. With an average humidity level of 76%, it’s a month where you might feel both the warmth and a touch of dampness in the air.

September Temperature in South Dayton

In September in South Dayton, the average temperature is 17°C (62°F). Maximum temperatures can reach 30°C (87°F), while minimum temperatures can drop as low as 2°C (35°F). This makes South Dayton a great destination for travelers looking to enjoy a mild climate with the potential for both warm days and cool evenings.

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

The chart illustrates September temperature patterns in South Dayton, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In South Dayton, September typically has an average temperature of 17°C (62°F), with highs reaching up to 30°C (87°F) and lows dropping to around 2°C (35°F).
JanFebMarAprMayJunJulAugSepOctNovDec252834445765706862523731
Data source: Temperature data for South Dayton 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 Dayton

In South Dayton in September, the total precipitation amount is 88 mm (3.5 in) spread over 11 days.

September Precipitation Trends in South Dayton

The chart displays monthly precipitation patterns in South Dayton, 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 Dayton, September typically receives around 88 mm (3.5 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec10211010313013514615411389148125118
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in South Dayton

In South Dayton in September, humidity is 76%. With an average temperature of 17°C (62°F), this humidity feels like a warm, enveloping embrace, making travel feel slightly more challenging as it can lead to a sticky discomfort, especially during outdoor excursions.

September Average Humidity in South Dayton

This chart illustrates the average monthly humidity levels in South Dayton, 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 Dayton is approximately 76%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec91%91%88%88%82%80%77%72%76%83%88%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in South Dayton

In South Dayton 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 Dayton.

Maximum UV Index Levels in South Dayton for September

The chart shows the monthly maximum UV Index (UVI) for South Dayton 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 Dayton typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec35689101098642
Data source: South Dayton 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 Dayton Compares to Other Months

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

This table compares monthly weather conditions in South Dayton, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-4°C (25°F)102 mm (4.0 inches)91%moderate
February Weather-2°C (28°F)110 mm (4.3 inches)91%moderate
March Weather1°C (34°F)103 mm (4.1 inches)88%high
April Weather7°C (45°F)130 mm (5.1 inches)88%very high
May Weather14°C (57°F)135 mm (5.3 inches)82%very high
June Weather18°C (65°F)146 mm (5.7 inches)79%very high
July Weather21°C (70°F)154 mm (6.1 inches)77%very high
August Weather20°C (68°F)113 mm (4.4 inches)72%very high
September Weather17°C (62°F)88 mm (3.5 inches)76%very high
October Weather11°C (52°F)147 mm (5.8 inches)83%high
November Weather3°C (37°F)125 mm (4.9 inches)88%moderate
December Weather-1°C (31°F)118 mm (4.6 inches)87%low

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