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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 is a pleasant 23°C (74°F), with a minimum dipping to 7°C (45°F) and a maximum soaring to 35°C (96°F). Expect 147 mm (5.8 in) of precipitation over 9 days, accompanied by an average humidity level of 75%. Plan your activities accordingly to make the most of this delightful weather!

September Temperature in Mount Pleasant

In September in Mount Pleasant, the average temperature is 23°C (74°F). Maximum temperatures can reach up to 35°C (96°F), while minimums can drop as low as 7°C (45°F). This makes it an ideal time to explore Mount Pleasant, with warm days perfect for sightseeing and cooler evenings perfect for a cozy retreat.

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 23°C (74°F), with highs reaching up to 35°C (96°F) and lows dropping to around 7°C (45°F).
JanFebMarAprMayJunJulAugSepOctNovDec434853627076807874645046
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 totals 147 mm (5.8 in) over a span of 9 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 147 mm (5.8 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec941188510412193991061479790118
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 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 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 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 Mount Pleasant

In Mount Pleasant 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 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 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec46810101110109853
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 Weather6°C (43°F)94 mm (3.7 inches)86%moderate
February Weather9°C (49°F)118 mm (4.7 inches)85%high
March Weather12°C (53°F)85 mm (3.4 inches)84%very high
April Weather16°C (62°F)104 mm (4.1 inches)82%very high
May Weather21°C (71°F)121 mm (4.8 inches)83%very high
June Weather25°C (77°F)92 mm (3.6 inches)82%extreme
July Weather27°C (80°F)99 mm (3.9 inches)80%very high
August Weather26°C (78°F)106 mm (4.2 inches)74%very high
September Weather23°C (74°F)147 mm (5.8 inches)75%very high
October Weather18°C (65°F)97 mm (3.8 inches)79%very high
November Weather10°C (51°F)89 mm (3.5 inches)87%moderate
December Weather8°C (46°F)118 mm (4.6 inches)87%moderate

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