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September Weather in Chester, United States

Last updated: June 24, 2025

In Chester, United States, the average temperature in September hovers around 24°C (76°F). However, be prepared for a range that can dip as low as 10°C (50°F) at night and soar up to 36°C (97°F) during the day. Expect around 110 mm (4.3 in) of rainfall over 8 days, accompanied by an average humidity level of 75%. Whether you're exploring the outdoors or enjoying local hotspots, this month brings a lively mix of warmth and moisture!

September Temperature in Chester

In September in Chester, the average temperature is 24°C (76°F). Maximum temperatures can reach 36°C (97°F), while minimums can drop as low as 10°C (50°F). This makes Chester a great destination for travelers seeking warm weather while also being prepared for cooler evenings.

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 24°C (76°F), with highs reaching up to 36°C (97°F) and lows dropping to around 10°C (50°F).
JanFebMarAprMayJunJulAugSepOctNovDec465155637277817975675348
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 110 mm (4.3 in) over a period of 8 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 110 mm (4.3 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec9412588102110891091241108894130
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 24°C (76°F), this humidity feels like a warm embrace, making travel somewhat stifling but also richly invigorating, as the air seems to wrap around you, heightening the experience of the local sights and sounds.

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%85%84%82%83%82%80%74%75%79%87%87%
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.
JanFebMarAprMayJunJulAugSepOctNovDec46810101111109863
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 Weather8°C (46°F)94 mm (3.7 inches)86%moderate
February Weather10°C (51°F)124 mm (4.9 inches)85%high
March Weather13°C (56°F)88 mm (3.5 inches)84%very high
April Weather17°C (63°F)102 mm (4.0 inches)82%very high
May Weather22°C (72°F)110 mm (4.3 inches)83%very high
June Weather25°C (78°F)89 mm (3.5 inches)82%extreme
July Weather27°C (81°F)109 mm (4.3 inches)80%extreme
August Weather26°C (79°F)124 mm (4.9 inches)74%very high
September Weather24°C (76°F)110 mm (4.3 inches)75%very high
October Weather19°C (67°F)88 mm (3.5 inches)79%very high
November Weather11°C (53°F)94 mm (3.7 inches)87%high
December Weather9°C (49°F)130 mm (5.1 inches)87%moderate

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