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September Weather in Chester, United States

Last updated: June 24, 2025

In Chester, United States, the average temperature in September is a pleasant 23°C (73°F), making it an ideal time to explore. Be prepared for temperature fluctuations, as it can dip to a cool 8°C (46°F) or rise to a warm 35°C (95°F). Expect some rain, with an average precipitation of 64 mm (2.5 in) spread over 6 days. With an average humidity of 75%, don't forget to stay hydrated and enjoy the tropical experience!

September Temperature in Chester

In September in Chester, the average temperature is 23°C (73°F), with maximums reaching 35°C (95°F) and minimums dropping to 8°C (46°F). This range makes Chester an ideal destination for travelers seeking pleasant weather and a variety of outdoor activities.

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

The chart illustrates September temperature patterns in Chester, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Chester, September typically has an average temperature of 23°C (73°F), with highs reaching up to 35°C (95°F) and lows dropping to around 8°C (46°F).
JanFebMarAprMayJunJulAugSepOctNovDec343748566877807773604541
Data source: Temperature data for Chester 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 Chester

In Chester in September, the total precipitation amount is 64 mm (2.5 in) during a span of 6 days.

September Precipitation Trends in Chester

The chart displays monthly precipitation patterns in Chester, 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 Chester, September typically receives around 64 mm (2.5 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec881081361441588788103641258477
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Chester

In Chester in September, humidity is 75%. With an average temperature of 23°C (73°F), this humidity feels like a warm embrace, making travel slightly uncomfortable yet invigorating as the air wraps around you, creating a sense of walking through a lush, tropical paradise.

September Average Humidity in Chester

This chart illustrates the average monthly humidity levels in Chester, 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 Chester is approximately 75%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%84%84%80%82%83%80%76%75%75%85%88%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Chester

In Chester 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 Chester.

Maximum UV Index Levels in Chester for September

The chart shows the monthly maximum UV Index (UVI) for Chester 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 Chester typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3579111110109753
Data source: Chester 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 Chester Compares to Other Months

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

This table compares monthly weather conditions in Chester, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather1°C (34°F)88 mm (3.5 inches)86%moderate
February Weather3°C (38°F)108 mm (4.2 inches)84%moderate
March Weather9°C (48°F)136 mm (5.3 inches)84%high
April Weather13°C (56°F)144 mm (5.7 inches)80%very high
May Weather20°C (68°F)157 mm (6.2 inches)82%extreme
June Weather25°C (77°F)87 mm (3.4 inches)83%extreme
July Weather27°C (80°F)88 mm (3.5 inches)79%very high
August Weather25°C (77°F)103 mm (4.1 inches)76%very high
September Weather23°C (73°F)64 mm (2.5 inches)75%very high
October Weather16°C (60°F)125 mm (4.9 inches)74%high
November Weather7°C (45°F)84 mm (3.3 inches)85%moderate
December Weather5°C (41°F)77 mm (3.0 inches)88%moderate

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