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September Weather in Chester, United States

Last updated: June 24, 2025

In September, the average temperature in Chester, United States hovers around 14°C (58°F), with a minimum of -2°C (28°F) and a maximum reaching up to 35°C (95°F). During this month, you can expect 28 mm (1.1 in) of precipitation over approximately 5 days, accompanied by an average humidity level of 66%. Stay prepared for a variety of weather conditions!

September Temperature in Chester

In September in Chester, the average temperature is 14°C (58°F). The maximum can reach 35°C (95°F), while the minimum can be as low as -2°C (28°F). Travelers should be prepared for a wide range of temperatures and pack accordingly.

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 14°C (58°F), with highs reaching up to 35°C (95°F) and lows dropping to around -2°C (28°F).
JanFebMarAprMayJunJulAugSepOctNovDec211530415464726958423224
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 precipitation amount is 28 mm (1.1 in) over a period of 5 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 28 mm (1.1 inches) of precipitation spread over approximately 5 days.
JanFebMarAprMayJunJulAugSepOctNovDec133318375749102528202820
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 66%. With average temperature 14°C (58°F), this humidity feels like a damp chill that can make walking outdoors feel heavier, urging travelers to seek shelter or refreshment more often than usual.

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 66%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%89%83%76%73%75%75%70%67%72%82%89%
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 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more 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 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec235789997532
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 Weather-6°C (21°F)13 mm (0.5 inches)86%low
February Weather-9°C (15°F)33 mm (1.3 inches)89%moderate
March Weather-1°C (30°F)18 mm (0.7 inches)83%moderate
April Weather5°C (41°F)37 mm (1.4 inches)75%high
May Weather12°C (54°F)57 mm (2.2 inches)72%very high
June Weather18°C (64°F)48 mm (1.9 inches)75%very high
July Weather22°C (72°F)10 mm (0.4 inches)75%very high
August Weather20°C (69°F)25 mm (1.0 inches)69%very high
September Weather14°C (58°F)28 mm (1.1 inches)66%high
October Weather6°C (42°F)20 mm (0.8 inches)72%moderate
November Weather0°C (32°F)28 mm (1.1 inches)82%moderate
December Weather-5°C (24°F)20 mm (0.8 inches)89%low

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