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September Weather in Siler City, United States

Last updated: June 24, 2025

In September, the average temperature in Siler City, United States hovers around 23°C (74°F). Expect a range from a crisp 8°C (47°F) at night to a warm 35°C (96°F) during the day. However, be prepared for some rain, as 143 mm (5.6 in) of precipitation can fall over 11 days. With an average humidity of 79%, it's a good idea to stay hydrated and enjoy the lush surroundings!

September Temperature in Siler City

In September in Siler City, the average temperature is 23°C (74°F). The maximum can reach 35°C (96°F), and the minimum can drop as low as 8°C (47°F). This variety in temperatures makes Siler City a suitable destination for travelers seeking both warm days and cooler evenings.

September Weather in Siler City: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Siler City, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Siler City, September typically has an average temperature of 23°C (74°F), with highs reaching up to 35°C (96°F) and lows dropping to around 8°C (47°F).
JanFebMarAprMayJunJulAugSepOctNovDec434853617076807874655146
Data source: Temperature data for Siler City 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 Siler City

In Siler City in September, the total precipitation amount reaches 143 mm (5.6 in) over the course of 11 days.

September Precipitation Trends in Siler City

The chart displays monthly precipitation patterns in Siler City, 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 Siler City, September typically receives around 143 mm (5.6 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec91113811001171061061271448480107
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Siler City

In Siler City in September, humidity is 79%. With an average temperature of 23°C (74°F), this humidity feels like a warm, enveloping blanket that can make outdoor activities a bit less comfortable, urging travelers to seek shade and hydration throughout the day.

September Average Humidity in Siler City

This chart illustrates the average monthly humidity levels in Siler City, 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 Siler City is approximately 79%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%82%81%80%81%81%81%80%79%80%86%86%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Siler City

In Siler City 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 Siler City.

Maximum UV Index Levels in Siler City for September

The chart shows the monthly maximum UV Index (UVI) for Siler City 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 Siler City typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec46810111111109853
Data source: Siler City 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 Siler City Compares to Other Months

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

This table compares monthly weather conditions in Siler City, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather6°C (43°F)91 mm (3.6 inches)85%moderate
February Weather9°C (49°F)113 mm (4.4 inches)82%high
March Weather11°C (53°F)81 mm (3.2 inches)81%very high
April Weather16°C (62°F)100 mm (3.9 inches)80%very high
May Weather21°C (70°F)117 mm (4.6 inches)81%extreme
June Weather24°C (76°F)106 mm (4.2 inches)81%extreme
July Weather27°C (80°F)106 mm (4.2 inches)81%extreme
August Weather26°C (78°F)127 mm (5.0 inches)80%very high
September Weather23°C (74°F)143 mm (5.6 inches)79%very high
October Weather18°C (65°F)84 mm (3.3 inches)80%very high
November Weather10°C (51°F)80 mm (3.1 inches)85%moderate
December Weather8°C (47°F)107 mm (4.2 inches)86%moderate

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