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September Weather in Mount Pleasant, United States

Last updated: June 24, 2025

In September, the average temperature in Mount Pleasant, United States hovers around 19°C (66°F). Visitors can expect a minimum temperature of 11°C (51°F) and a pleasant maximum of 27°C (80°F). With an average precipitation of 86 mm (3.4 in) spread over 10 days, and a high humidity level of 79%, it's a month to enjoy the fresh, vibrant atmosphere of the region! 🌧️☀️

September Temperature in Mount Pleasant

In September in Mount Pleasant, the average temperature is 19°C (66°F). Maximum can reach 27°C (80°F), and the minimum can be as low as 11°C (51°F). This makes it a great time for outdoor activities and exploring the area comfortably.

September Weather in Mount Pleasant: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Mount Pleasant, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Mount Pleasant, September typically has an average temperature of 19°C (66°F), with highs reaching up to 27°C (80°F) and lows dropping to around 11°C (51°F).
JanFebMarAprMayJunJulAugSepOctNovDec272834394758687166544034
Data source: Temperature data for Mount Pleasant 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 Mount Pleasant

In Mount Pleasant in September, the precipitation amount is 86 mm (3.4 in) over the course of 10 days.

September Precipitation Trends in Mount Pleasant

The chart displays monthly precipitation patterns in Mount Pleasant, 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 Mount Pleasant, September typically receives around 86 mm (3.4 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec757476112148876158861436864
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Mount Pleasant

In Mount Pleasant in September humidity is 79%. With an average temperature of 19°C (66°F), this humidity feels like a warm embrace, making it feel much warmer than the actual temperature and creating a heavy, sticky atmosphere that can be a bit uncomfortable for traveling.

September Average Humidity in Mount Pleasant

This chart illustrates the average monthly humidity levels in Mount Pleasant, 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 Mount Pleasant is approximately 79%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%85%85%85%78%80%78%76%79%83%88%82%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Mount Pleasant

In Mount Pleasant in September, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in Mount Pleasant.

Maximum UV Index Levels in Mount Pleasant for September

The chart shows the monthly maximum UV Index (UVI) for Mount Pleasant 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 Mount Pleasant typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec24589101097532
Data source: Mount Pleasant 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 Mount Pleasant Compares to Other Months

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

This table compares monthly weather conditions in Mount Pleasant, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-3°C (28°F)75 mm (2.9 inches)85%low
February Weather-2°C (28°F)74 mm (2.9 inches)85%moderate
March Weather1°C (34°F)76 mm (3.0 inches)85%moderate
April Weather4°C (40°F)112 mm (4.4 inches)85%very high
May Weather8°C (47°F)148 mm (5.8 inches)78%very high
June Weather15°C (59°F)87 mm (3.4 inches)80%very high
July Weather20°C (69°F)61 mm (2.4 inches)78%very high
August Weather21°C (71°F)58 mm (2.3 inches)76%very high
September Weather19°C (66°F)86 mm (3.4 inches)79%high
October Weather12°C (54°F)143 mm (5.6 inches)83%moderate
November Weather4°C (40°F)68 mm (2.7 inches)88%moderate
December Weather1°C (34°F)64 mm (2.5 inches)81%low

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