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September Weather in Chambersburg, United States

Last updated: June 24, 2025

In September, the average temperature in Chambersburg, United States hovers around 20°C (68°F). However, be prepared for a range as the minimum can drop to 3°C (38°F), while the maximum can soar up to 34°C (93°F). During this month, you can expect around 124 mm (4.9 in) of precipitation spread over 9 days, with an average humidity level of 68%.

September Temperature in Chambersburg

In September in Chambersburg, the average temperature is 20°C (68°F). Maximums can reach 34°C (93°F), and minimums can be as low as 3°C (38°F). Be prepared for a range of weather conditions during your travels!

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

The chart illustrates September temperature patterns in Chambersburg, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Chambersburg, September typically has an average temperature of 20°C (68°F), with highs reaching up to 34°C (93°F) and lows dropping to around 3°C (38°F).
JanFebMarAprMayJunJulAugSepOctNovDec323642526371777468584336
Data source: Temperature data for Chambersburg 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 Chambersburg

In Chambersburg in September, the precipitation amount is 124 mm (4.9 in) over the course of 9 days.

September Precipitation Trends in Chambersburg

The chart displays monthly precipitation patterns in Chambersburg, 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 Chambersburg, September typically receives around 124 mm (4.9 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec62999010611792128931251088293
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Chambersburg

In Chambersburg in September humidity is 68%. With an average temperature of 20°C (68°F), this humidity feels like a warm embrace, making it ideal for leisurely strolls while also prompting travelers to stay hydrated and seek out refreshing breaks from the heat.

September Average Humidity in Chambersburg

This chart illustrates the average monthly humidity levels in Chambersburg, 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 Chambersburg is approximately 68%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%86%86%84%78%79%70%59%68%80%87%85%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Chambersburg

In Chambersburg 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 Chambersburg.

Maximum UV Index Levels in Chambersburg for September

The chart shows the monthly maximum UV Index (UVI) for Chambersburg 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 Chambersburg typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec357910101098642
Data source: Chambersburg 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 Chambersburg Compares to Other Months

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

This table compares monthly weather conditions in Chambersburg, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather0°C (32°F)61 mm (2.4 inches)86%moderate
February Weather2°C (36°F)99 mm (3.9 inches)86%moderate
March Weather5°C (42°F)90 mm (3.5 inches)86%high
April Weather11°C (53°F)106 mm (4.2 inches)84%very high
May Weather17°C (63°F)117 mm (4.6 inches)78%very high
June Weather22°C (71°F)92 mm (3.6 inches)79%very high
July Weather25°C (77°F)128 mm (5.0 inches)70%very high
August Weather24°C (75°F)93 mm (3.7 inches)59%very high
September Weather20°C (68°F)124 mm (4.9 inches)68%very high
October Weather14°C (58°F)108 mm (4.3 inches)80%high
November Weather6°C (43°F)82 mm (3.2 inches)86%moderate
December Weather2°C (37°F)93 mm (3.7 inches)85%low

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