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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 15°C (59°F), offering a pleasant climate. Be prepared for temperature variations, as the minimum can drop to -11°C (13°F), while the maximum can soar to 31°C (89°F). Rainfall is moderate, with an average precipitation of 31 mm (1.2 in) spread over about 5 days. The air maintains a comfortable average humidity of 47%, making it an inviting time to explore the beauty of the area.

September Temperature in Mount Pleasant

In September, in Mount Pleasant, the average temperature is 15°C (59°F), with maximums reaching up to 31°C (89°F) and minimums dipping as low as -11°C (13°F), making it essential to pack for both warm days and chilly nights while traveling.

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 15°C (59°F), with highs reaching up to 31°C (89°F) and lows dropping to around -11°C (13°F).
JanFebMarAprMayJunJulAugSepOctNovDec222432384863706858413323
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 31 mm (1.2 in) spread over 5 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 31 mm (1.2 inches) of precipitation spread over approximately 5 days.
JanFebMarAprMayJunJulAugSepOctNovDec565960436318422531403653
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 47%. With an average temperature of 15°C (59°F), this humidity feels like a refreshing embrace, making travel comfortable yet invigorating, perfect for exploring the sights without feeling overly sticky or weighed down.

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 47%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%88%77%70%54%45%37%34%47%67%82%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 reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. 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 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec469101112121110754
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-6°C (22°F)56 mm (2.2 inches)87%moderate
February Weather-5°C (24°F)59 mm (2.3 inches)88%high
March Weather0°C (32°F)60 mm (2.4 inches)77%very high
April Weather3°C (38°F)43 mm (1.7 inches)69%very high
May Weather9°C (49°F)63 mm (2.5 inches)54%extreme
June Weather17°C (63°F)18 mm (0.7 inches)45%extreme
July Weather21°C (70°F)42 mm (1.7 inches)37%extreme
August Weather20°C (68°F)25 mm (1.0 inches)34%extreme
September Weather15°C (59°F)31 mm (1.2 inches)47%very high
October Weather5°C (42°F)40 mm (1.6 inches)67%high
November Weather1°C (34°F)36 mm (1.4 inches)82%moderate
December Weather-5°C (23°F)53 mm (2.1 inches)87%moderate

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