nomadseason

September Weather in Gettysburg, United States

Last updated: June 24, 2025

In September, the average temperature in Gettysburg, United States hovers around 18°C (64°F), with a range that can drop to a chilly 1°C (35°F) and peak at a warm 34°C (94°F). During this month, you can expect approximately 65 mm (2.6 in) of precipitation spread over 5 days, contributing to an average humidity of 73%. Stay prepared for a mix of weather!

September Temperature in Gettysburg

In September, in Gettysburg, the average temperature is 18°C (64°F). Maximums can reach 34°C (94°F), while minimums can be as low as 1°C (35°F). Be prepared for a range of temperatures to ensure a comfortable travel experience.

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

The chart illustrates September temperature patterns in Gettysburg, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Gettysburg, September typically has an average temperature of 18°C (64°F), with highs reaching up to 34°C (94°F) and lows dropping to around 1°C (35°F).
JanFebMarAprMayJunJulAugSepOctNovDec171532425771757264453424
Data source: Temperature data for Gettysburg 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 Gettysburg

In Gettysburg, in September, the precipitation amount is 65 mm (2.6 in) over a period of 5 days.

September Precipitation Trends in Gettysburg

The chart displays monthly precipitation patterns in Gettysburg, 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 Gettysburg, September typically receives around 65 mm (2.6 inches) of precipitation spread over approximately 5 days.
JanFebMarAprMayJunJulAugSepOctNovDec132031466367926665601226
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

September Humidity in Gettysburg

In Gettysburg in September, humidity is 73%. With an average temperature of 18°C (64°F), this humidity feels like a warm, sticky embrace that can leave travelers feeling a bit sluggish, making outdoor activities feel more demanding and encouraging frequent breaks to hydrate and cool off.

September Average Humidity in Gettysburg

This chart illustrates the average monthly humidity levels in Gettysburg, 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 Gettysburg is approximately 73%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec78%81%72%73%75%82%83%82%73%71%78%76%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Gettysburg

In Gettysburg 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 Gettysburg.

Maximum UV Index Levels in Gettysburg for September

The chart shows the monthly maximum UV Index (UVI) for Gettysburg 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 Gettysburg typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec25579101098532
Data source: Gettysburg 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 Gettysburg Compares to Other Months

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

This table compares monthly weather conditions in Gettysburg, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-8°C (17°F)13 mm (0.5 inches)78%low
February Weather-10°C (15°F)20 mm (0.8 inches)81%moderate
March Weather0°C (32°F)31 mm (1.2 inches)71%moderate
April Weather6°C (42°F)46 mm (1.8 inches)73%high
May Weather14°C (57°F)63 mm (2.5 inches)75%very high
June Weather22°C (71°F)67 mm (2.6 inches)82%very high
July Weather24°C (76°F)92 mm (3.6 inches)83%very high
August Weather22°C (72°F)66 mm (2.6 inches)82%very high
September Weather18°C (64°F)65 mm (2.6 inches)73%very high
October Weather7°C (46°F)60 mm (2.4 inches)71%moderate
November Weather1°C (34°F)12 mm (0.5 inches)78%moderate
December Weather-4°C (24°F)26 mm (1.0 inches)76%low

Compare Gettysburg's Climate with Cities Worldwide