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September Weather in Summerville, United States

Last updated: June 24, 2025

In Summerville, United States, the average temperature in September is a pleasant 24°C (75°F). However, temperatures can fluctuate, dipping to a cool 10°C (50°F) at night and soaring to a warm 35°C (96°F) during the day. You can expect about 111 mm (4.4 in) of precipitation spread over 8 days, with an average humidity of 64% adding a touch of mugginess to the air. Enjoy the diverse weather as you explore this vibrant destination!

September Temperature in Summerville

In September in Summerville, the average temperature is 24°C (75°F). Maximums can reach 35°C (96°F), and minimums can be as low as 10°C (50°F). Overall, this climate makes Summerville an ideal destination for travelers seeking pleasant weather and a range of outdoor activities.

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 24°C (75°F), with highs reaching up to 35°C (96°F) and lows dropping to around 10°C (50°F).
JanFebMarAprMayJunJulAugSepOctNovDec444955627176807875655147
Data source: Temperature data for Summerville 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 Summerville

In Summerville in September, the precipitation amount is 111 mm (4.4 in) spread over 8 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 111 mm (4.4 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec1231981691539512911313811113689161
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Summerville

In Summerville in September humidity is 64%. With average temperature 24°C (75°F), this humidity feels like a warm blanket enveloping you, making outdoor exploration both refreshing and a little sticky, perfect for leisurely strolls and shaded cafes but with a need for frequent water breaks.

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 64%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%87%85%82%83%82%78%67%64%75%87%89%
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.
JanFebMarAprMayJunJulAugSepOctNovDec46810111111119764
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.
 TemperaturePrecipitationHumidityUV
January Weather7°C (44°F)123 mm (4.8 inches)87%moderate
February Weather10°C (50°F)198 mm (7.8 inches)87%high
March Weather13°C (56°F)169 mm (6.7 inches)85%very high
April Weather16°C (62°F)153 mm (6.0 inches)82%very high
May Weather22°C (71°F)95 mm (3.7 inches)83%extreme
June Weather25°C (76°F)129 mm (5.1 inches)82%extreme
July Weather26°C (80°F)113 mm (4.4 inches)78%extreme
August Weather26°C (79°F)138 mm (5.4 inches)67%extreme
September Weather24°C (75°F)111 mm (4.4 inches)64%very high
October Weather18°C (65°F)136 mm (5.4 inches)74%high
November Weather11°C (51°F)89 mm (3.5 inches)87%high
December Weather8°C (47°F)161 mm (6.3 inches)88%moderate

Compare Summerville's Climate with Cities Worldwide