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September Weather in South Williamson, United States

Last updated: June 24, 2025

In September, the average temperature in South Williamson, United States is a pleasant 21°C (70°F). However, temperatures can range from a cool 8°C (46°F) to a warm 35°C (95°F). Visitors should also prepare for 107 mm (4.2 in) of precipitation over approximately 9 days. With an average humidity of 68%, staying hydrated and comfortable is key during your stay!

September Temperature in South Williamson

In September in South Williamson, the average temperature is 21°C (70°F). Maximum can reach 35°C (95°F) and minimum can be as low as 8°C (46°F). This range makes South Williamson an ideal destination for travelers seeking both warm days and cool evenings.

September Weather in South Williamson: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in South Williamson, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In South Williamson, September typically has an average temperature of 21°C (70°F), with highs reaching up to 35°C (95°F) and lows dropping to around 8°C (46°F).
JanFebMarAprMayJunJulAugSepOctNovDec374248566672767470604642
Data source: Temperature data for South Williamson 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 South Williamson

In South Williamson in September, the precipitation amount is 107 mm (4.2 in), occurring over a span of 9 days.

September Precipitation Trends in South Williamson

The chart displays monthly precipitation patterns in South Williamson, 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 South Williamson, September typically receives around 107 mm (4.2 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec10217012913313615811912110712481126
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in South Williamson

In South Williamson in September humidity is 68%. With an average temperature of 21°C (70°F), this humidity feels like a warm embrace, making the air feel slightly heavy and sticky, which can be quite exhausting for travelers.

September Average Humidity in South Williamson

This chart illustrates the average monthly humidity levels in South Williamson, 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 South Williamson is approximately 68%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%87%86%84%83%83%79%66%68%78%89%86%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in South Williamson

In South Williamson 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 South Williamson.

Maximum UV Index Levels in South Williamson for September

The chart shows the monthly maximum UV Index (UVI) for South Williamson 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 South Williamson typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3679101011109753
Data source: South Williamson 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 South Williamson Compares to Other Months

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

This table compares monthly weather conditions in South Williamson, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather3°C (37°F)101 mm (4.0 inches)87%moderate
February Weather6°C (43°F)170 mm (6.7 inches)87%high
March Weather9°C (48°F)129 mm (5.1 inches)86%high
April Weather13°C (56°F)133 mm (5.2 inches)84%very high
May Weather19°C (66°F)136 mm (5.4 inches)83%very high
June Weather22°C (72°F)158 mm (6.2 inches)83%very high
July Weather25°C (76°F)119 mm (4.7 inches)79%extreme
August Weather23°C (74°F)121 mm (4.8 inches)66%very high
September Weather21°C (70°F)107 mm (4.2 inches)68%very high
October Weather16°C (61°F)124 mm (4.9 inches)78%high
November Weather8°C (46°F)81 mm (3.2 inches)89%moderate
December Weather5°C (42°F)126 mm (4.9 inches)86%moderate

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