September Weather in Summerville, United States

Last updated: June 24, 2025

In September, the average temperature in Summerville, United States hovers around 25°C (77°F), providing a pleasant climate for outdoor activities. During this month, temperatures can dip to a minimum of 11°C (53°F) and soar to a maximum of 36°C (97°F). Expect about 146 mm (5.8 in) of precipitation spread across 12 days, making it a good idea to carry an umbrella. With an average humidity level of 83%, the air will feel quite tropical, adding to the unique charm of this location.

September Temperature in Summerville

In September in Summerville, the average temperature is 25°C (77°F). Maximum temperatures can reach 36°C (97°F), while minimums can drop to as low as 11°C (53°F). This makes Summerville an ideal destination for travelers seeking comfortable weather with warm days and cooler evenings.

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

The chart illustrates September temperature patterns in Summerville, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Summerville, September typically has an average temperature of 25°C (77°F), with highs reaching up to 36°C (97°F) and lows dropping to around 11°C (53°F).

Data source: Temperature data for Summerville generated using information from the Copernicus Climate Change Service.

September Precipitation in Summerville

In Summerville in September, the precipitation amount is 146 mm (5.8 in) spread over 12 days.

September Precipitation Trends in Summerville

The chart displays monthly precipitation patterns in Summerville, 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 Summerville, September typically receives around 146 mm (5.8 inches) of precipitation spread over approximately 12 days.

Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

September Humidity in Summerville

In Summerville in September humidity is 83%. With an average temperature of 25°C (77°F), this humidity feels like a warm, enveloping blanket, making it essential for travelers to stay hydrated and seek shade to enjoy their adventures comfortably.

September Average Humidity in Summerville

This chart illustrates the average monthly humidity levels in Summerville, 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 Summerville is approximately 83%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Summerville

In Summerville 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 Summerville.

Maximum UV Index Levels in Summerville for September

The chart shows the monthly maximum UV Index (UVI) for Summerville 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 Summerville typically reaches 9, which falls under the very high exposure category.

Data source: Summerville 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 Summerville Compares to Other Months

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

This table compares monthly weather conditions in Summerville, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	10°C (51°F)	64 mm (2.5 inches)	86%	moderate
February Weather	13°C (56°F)	92 mm (3.6 inches)	81%	high
March Weather	15°C (60°F)	71 mm (2.8 inches)	81%	very high
April Weather	19°C (66°F)	108 mm (4.2 inches)	79%	very high
May Weather	23°C (74°F)	92 mm (3.6 inches)	75%	extreme
June Weather	26°C (79°F)	156 mm (6.1 inches)	75%	extreme
July Weather	27°C (81°F)	191 mm (7.5 inches)	80%	extreme
August Weather	27°C (81°F)	176 mm (6.9 inches)	81%	extreme
September Weather	25°C (77°F)	146 mm (5.8 inches)	83%	very high
October Weather	21°C (70°F)	75 mm (3.0 inches)	78%	very high
November Weather	14°C (57°F)	70 mm (2.8 inches)	85%	high
December Weather	12°C (53°F)	132 mm (5.2 inches)	87%	moderate