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September Weather in Bluffton, United States

Last updated: June 24, 2025

In September, the average temperature in Bluffton, United States hovers around 20°C (69°F). Expect the minimum to drop to 4°C (39°F), while the maximum can soar up to 33°C (92°F). Be prepared for some rain, as the region sees about 67 mm (2.6 in) of precipitation over 8 days, contributing to an average humidity of 78%.

September Temperature in Bluffton

In September in Bluffton, the average temperature is 20°C (69°F). Maximums can reach 33°C (92°F), while minimums can drop to as low as 4°C (39°F). This variation in temperature makes it a perfect time for travelers to enjoy a mix of warm days and cooler nights, allowing for comfortable outdoor activities.

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

The chart illustrates September temperature patterns in Bluffton, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Bluffton, September typically has an average temperature of 20°C (69°F), with highs reaching up to 33°C (92°F) and lows dropping to around 4°C (39°F).
JanFebMarAprMayJunJulAugSepOctNovDec293141506372767368574135
Data source: Temperature data for Bluffton 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 Bluffton

In Bluffton in September, the total precipitation amount is 67 mm (2.6 in) over the course of 8 days.

September Precipitation Trends in Bluffton

The chart displays monthly precipitation patterns in Bluffton, 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 Bluffton, September typically receives around 67 mm (2.6 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec75841029312611010597671018264
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Bluffton

In Bluffton in September, humidity is 78%. With an average temperature of 20°C (69°F), this humidity feels like a warm, enveloping blanket, making travel somewhat uncomfortable as sweat clings to your skin and the air feels thick and heavy, urging you to seek out shaded areas and refreshing drinks.

September Average Humidity in Bluffton

This chart illustrates the average monthly humidity levels in Bluffton, 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 Bluffton is approximately 78%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%85%86%87%81%82%81%79%78%81%89%86%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Bluffton

In Bluffton 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 Bluffton.

Maximum UV Index Levels in Bluffton for September

The chart shows the monthly maximum UV Index (UVI) for Bluffton 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 Bluffton typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec35699101098642
Data source: Bluffton 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 Bluffton Compares to Other Months

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

This table compares monthly weather conditions in Bluffton, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-2°C (29°F)75 mm (2.9 inches)85%moderate
February Weather0°C (31°F)84 mm (3.3 inches)85%moderate
March Weather5°C (41°F)102 mm (4.0 inches)86%high
April Weather10°C (51°F)93 mm (3.7 inches)87%very high
May Weather17°C (63°F)126 mm (4.9 inches)81%very high
June Weather22°C (73°F)110 mm (4.3 inches)82%very high
July Weather25°C (76°F)105 mm (4.1 inches)81%very high
August Weather23°C (74°F)97 mm (3.8 inches)79%very high
September Weather20°C (69°F)67 mm (2.6 inches)78%very high
October Weather14°C (57°F)101 mm (4.0 inches)81%high
November Weather5°C (41°F)82 mm (3.2 inches)89%moderate
December Weather2°C (35°F)64 mm (2.5 inches)86%low

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