nomadseason

September Weather in Mechanicsburg, United States

Last updated: June 24, 2025

In Mechanicsburg, United States, the average temperature in September hovers around 20°C (69°F), with a minimum dipping to 5°C (41°F) and a maximum reaching up to 34°C (94°F). Expect an average precipitation of 94 mm (3.7 in) spread over 8 days, with an average humidity of 73%. Prepare for a month of warm days and occasional showers!

September Temperature in Mechanicsburg

In September in Mechanicsburg, the average temperature is 20°C (69°F). Maximums can reach 34°C (94°F), while minimums can drop as low as 5°C (41°F). This makes Mechanicsburg a suitable destination for travelers looking to experience mild weather with the possibility of warmer days.

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

The chart illustrates September temperature patterns in Mechanicsburg, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Mechanicsburg, September typically has an average temperature of 20°C (69°F), with highs reaching up to 34°C (94°F) and lows dropping to around 5°C (41°F).
JanFebMarAprMayJunJulAugSepOctNovDec303342526371757368574136
Data source: Temperature data for Mechanicsburg generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Mechanicsburg

In Mechanicsburg in September, the precipitation amount is 94 mm (3.7 in) over the course of 8 days.

September Precipitation Trends in Mechanicsburg

The chart displays monthly precipitation patterns in Mechanicsburg, 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 Mechanicsburg, September typically receives around 94 mm (3.7 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec751041081111311341219994959595
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

September Humidity in Mechanicsburg

In Mechanicsburg in September humidity is 73%. With an average temperature of 20°C (69°F), this humidity feels like a warm embrace, making travel slightly sticky but ultimately comfortable as long as you stay hydrated and take breaks in the shade.

September Average Humidity in Mechanicsburg

This chart illustrates the average monthly humidity levels in Mechanicsburg, 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 Mechanicsburg is approximately 73%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%88%87%85%81%82%81%73%73%78%89%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Mechanicsburg

In Mechanicsburg 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 Mechanicsburg.

Maximum UV Index Levels in Mechanicsburg for September

The chart shows the monthly maximum UV Index (UVI) for Mechanicsburg 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 Mechanicsburg typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356910101098643
Data source: Mechanicsburg 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 Mechanicsburg Compares to Other Months

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

This table compares monthly weather conditions in Mechanicsburg, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (30°F)75 mm (3.0 inches)88%moderate
February Weather1°C (34°F)104 mm (4.1 inches)88%moderate
March Weather6°C (42°F)108 mm (4.2 inches)87%high
April Weather11°C (52°F)111 mm (4.4 inches)85%very high
May Weather17°C (64°F)131 mm (5.1 inches)81%very high
June Weather22°C (72°F)134 mm (5.3 inches)82%very high
July Weather24°C (75°F)120 mm (4.7 inches)81%very high
August Weather23°C (73°F)99 mm (3.9 inches)73%very high
September Weather20°C (69°F)94 mm (3.7 inches)73%very high
October Weather14°C (58°F)95 mm (3.7 inches)78%high
November Weather5°C (42°F)95 mm (3.7 inches)89%moderate
December Weather2°C (36°F)95 mm (3.8 inches)87%moderate

Compare Mechanicsburg's Climate with Cities Worldwide