September Weather in Chester Springs, United States

Last updated: June 24, 2025

In September, the average temperature in Chester Springs, United States is a pleasant 21°C (70°F). Expect a range with minimums dipping to 6°C (42°F) and maximums soaring up to 34°C (94°F). You'll also encounter about 103 mm (4.0 in) of precipitation over 10 days, accompanied by an average humidity of 75%.

September Temperature in Chester Springs

In September in Chester Springs, the average temperature is 21°C (70°F). The maximum can reach 34°C (94°F), while the minimum can be as low as 6°C (42°F). This pleasant temperature range makes Chester Springs an ideal destination for travelers looking to enjoy a comfortable climate.

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

The chart illustrates September temperature patterns in Chester Springs, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Chester Springs, September typically has an average temperature of 21°C (70°F), with highs reaching up to 34°C (94°F) and lows dropping to around 6°C (42°F).

Data source: Temperature data for Chester Springs generated using information from the Copernicus Climate Change Service.

September Precipitation in Chester Springs

In Chester Springs in September, the precipitation amount is 103 mm (4.0 in) over a span of 10 days.

September Precipitation Trends in Chester Springs

The chart displays monthly precipitation patterns in Chester Springs, 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 Springs, September typically receives around 103 mm (4.0 inches) of precipitation spread over approximately 10 days.

Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

September Humidity in Chester Springs

In Chester Springs in September, humidity is 75%. With an average temperature of 21°C (70°F), this humidity feels like a warm, enveloping blanket that makes exploring the area feel slightly sticky, requiring travelers to stay hydrated and take occasional breaks in the shade to fully enjoy their adventures.

September Average Humidity in Chester Springs

This chart illustrates the average monthly humidity levels in Chester Springs, 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 Springs is approximately 75%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Chester Springs

In Chester Springs in September, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Chester Springs.

Maximum UV Index Levels in Chester Springs for September

The chart shows the monthly maximum UV Index (UVI) for Chester Springs 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 Springs typically reaches 8, which falls under the very high exposure category.

Data source: Chester Springs 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 Springs Compares to Other Months

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

This table compares monthly weather conditions in Chester Springs, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	2°C (35°F)	66 mm (2.6 inches)	84%	moderate
February Weather	3°C (38°F)	108 mm (4.3 inches)	83%	moderate
March Weather	6°C (44°F)	107 mm (4.2 inches)	83%	high
April Weather	12°C (54°F)	108 mm (4.3 inches)	81%	very high
May Weather	18°C (64°F)	139 mm (5.5 inches)	78%	very high
June Weather	23°C (73°F)	115 mm (4.5 inches)	79%	very high
July Weather	26°C (78°F)	144 mm (5.7 inches)	74%	very high
August Weather	24°C (76°F)	152 mm (6.0 inches)	72%	very high
September Weather	21°C (70°F)	103 mm (4.0 inches)	75%	very high
October Weather	16°C (61°F)	104 mm (4.1 inches)	81%	high
November Weather	8°C (46°F)	84 mm (3.3 inches)	85%	moderate
December Weather	4°C (39°F)	102 mm (4.0 inches)	84%	low