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September Weather in Mount Pleasant, United States

Last updated: June 24, 2025

In Mount Pleasant, United States, the average temperature in September is a warm 26°C (79°F), with a minimum dipping to 10°C (50°F) and a maximum soaring to 39°C (102°F). Expect 80 mm (3.1 in) of precipitation over about 8 days, accompanied by an average humidity level of 65%.

September Temperature in Mount Pleasant

In September in Mount Pleasant, the average temperature is 26°C (79°F). Maximums can reach 39°C (102°F), and minimums can be as low as 10°C (50°F). Be prepared for a wide range of temperatures, making it essential to pack for both warm days and cooler nights when 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 26°C (79°F), with highs reaching up to 39°C (102°F) and lows dropping to around 10°C (50°F).
JanFebMarAprMayJunJulAugSepOctNovDec464959647380838378675551
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 80 mm (3.1 in) over a period of 8 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 80 mm (3.1 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec10114313120316010175788013165114
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 65%. With an average temperature of 26°C (79°F), this humidity feels like a warm, enveloping blanket, making travel quite sticky and uncomfortable.

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 65%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec80%79%78%78%81%78%73%66%65%72%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.
JanFebMarAprMayJunJulAugSepOctNovDec468101111111110864
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 Weather8°C (47°F)101 mm (4.0 inches)80%moderate
February Weather9°C (49°F)143 mm (5.6 inches)79%high
March Weather15°C (59°F)131 mm (5.2 inches)78%very high
April Weather18°C (64°F)203 mm (8.0 inches)78%very high
May Weather23°C (73°F)160 mm (6.3 inches)81%extreme
June Weather27°C (80°F)101 mm (4.0 inches)78%extreme
July Weather29°C (84°F)75 mm (3.0 inches)73%extreme
August Weather28°C (83°F)78 mm (3.1 inches)66%extreme
September Weather26°C (79°F)80 mm (3.1 inches)65%very high
October Weather19°C (67°F)131 mm (5.2 inches)72%very high
November Weather13°C (55°F)65 mm (2.5 inches)82%high
December Weather10°C (51°F)114 mm (4.5 inches)87%moderate

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