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September Weather in Simpsonville, United States

Last updated: June 24, 2025

In Simpsonville, United States, the average temperature in September is a pleasant 23°C (74°F). However, be prepared for temperature variations, with a minimum as low as 9°C (48°F) and soaring highs up to 35°C (95°F). During this month, expect about 131 mm (5.2 in) of precipitation spread over 9 days, and the air will be quite humid, with an average humidity of 75%.

September Temperature in Simpsonville

In September in Simpsonville, the average temperature is 23°C (74°F). Maximums can reach 35°C (95°F), and minimums can be as low as 9°C (48°F). This makes Simpsonville a great destination for travelers seeking a comfortable climate to explore outdoor activities and enjoy the local scenery.

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 23°C (74°F), with highs reaching up to 35°C (95°F) and lows dropping to around 9°C (48°F).
JanFebMarAprMayJunJulAugSepOctNovDec444954627076807974655147
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 131 mm (5.2 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 131 mm (5.2 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec931331051211378910212813111795123
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 75%. With an average temperature of 23°C (74°F), this humidity feels like a warm, heavy blanket wrapping around you, making it feel more sweltering than it actually is, which can be quite uncomfortable for traveling.

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 75%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%85%84%82%83%82%80%74%75%79%87%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 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check 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 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec46810111111109864
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 Weather7°C (44°F)93 mm (3.7 inches)86%moderate
February Weather10°C (50°F)133 mm (5.2 inches)85%high
March Weather12°C (55°F)105 mm (4.1 inches)84%very high
April Weather17°C (62°F)121 mm (4.8 inches)82%very high
May Weather21°C (71°F)137 mm (5.4 inches)83%extreme
June Weather25°C (77°F)89 mm (3.5 inches)82%extreme
July Weather27°C (80°F)102 mm (4.0 inches)80%extreme
August Weather26°C (79°F)128 mm (5.0 inches)74%very high
September Weather23°C (74°F)131 mm (5.2 inches)75%very high
October Weather18°C (65°F)117 mm (4.6 inches)79%very high
November Weather11°C (51°F)95 mm (3.7 inches)87%high
December Weather8°C (47°F)123 mm (4.8 inches)87%moderate

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