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September Weather in Simpsonville, United States

Last updated: June 24, 2025

In September, the average temperature in Simpsonville, United States is a pleasant 22°C (71°F). Expect some variability, with minimums dropping to 8°C (46°F) and maximums peaking at 35°C (96°F). You'll also encounter 123 mm (4.8 in) of precipitation over approximately 9 days, contributing to an average humidity of around 69%.

September Temperature in Simpsonville

In September in Simpsonville, the average temperature is 22°C (71°F). Maximums can reach 35°C (96°F), while minimums can drop to as low as 8°C (46°F). Be prepared for a range of temperatures to make the most of your travel experience.

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

The chart illustrates September temperature patterns in Simpsonville, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Simpsonville, September typically has an average temperature of 22°C (71°F), with highs reaching up to 35°C (96°F) and lows dropping to around 8°C (46°F).
JanFebMarAprMayJunJulAugSepOctNovDec353947556774787671604541
Data source: Temperature data for Simpsonville 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 Simpsonville

In Simpsonville in September, the precipitation amount is 123 mm (4.8 in) over the course of 9 days.

September Precipitation Trends in Simpsonville

The chart displays monthly precipitation patterns in Simpsonville, 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 Simpsonville, September typically receives around 123 mm (4.8 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec9114014114612516810410012310790116
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Simpsonville

In Simpsonville in September humidity is 69%. With an average temperature of 22°C (71°F), this humidity feels like walking through a warm embrace, making travel slightly uncomfortable yet refreshing, as the air clings to your skin and adds a layer of warmth to your exploration.

September Average Humidity in Simpsonville

This chart illustrates the average monthly humidity levels in Simpsonville, 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 Simpsonville is approximately 69%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%85%86%84%79%82%79%70%69%76%88%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Simpsonville

In Simpsonville 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 Simpsonville.

Maximum UV Index Levels in Simpsonville for September

The chart shows the monthly maximum UV Index (UVI) for Simpsonville 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 Simpsonville typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3579101010108743
Data source: Simpsonville 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 Simpsonville Compares to Other Months

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

This table compares monthly weather conditions in Simpsonville, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather2°C (35°F)91 mm (3.6 inches)87%moderate
February Weather4°C (40°F)140 mm (5.5 inches)85%moderate
March Weather9°C (48°F)141 mm (5.6 inches)86%high
April Weather13°C (56°F)145 mm (5.7 inches)84%very high
May Weather19°C (67°F)125 mm (4.9 inches)79%very high
June Weather23°C (74°F)168 mm (6.6 inches)82%very high
July Weather25°C (78°F)104 mm (4.1 inches)79%very high
August Weather24°C (76°F)100 mm (3.9 inches)70%very high
September Weather22°C (71°F)123 mm (4.8 inches)69%very high
October Weather16°C (60°F)107 mm (4.2 inches)76%high
November Weather7°C (45°F)90 mm (3.5 inches)88%moderate
December Weather5°C (41°F)116 mm (4.6 inches)87%moderate

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