September Weather in Gettysburg, United States

Last updated: June 24, 2025

The average temperature in Gettysburg, United States during September is a pleasant 20°C (69°F). However, temperatures can vary significantly, with a minimum of 5°C (41°F) and a maximum soaring to 34°C (93°F). Expect 87 mm (3.4 in) of precipitation spread over about 7 days, complemented by an average humidity level of 73%.

September Temperature in Gettysburg

In September in Gettysburg, the average temperature is 20°C (69°F). Maximums can reach 34°C (93°F), and minimums can be as low as 5°C (41°F). This makes it a great time to visit, as you can enjoy warm days while still experiencing cooler evenings.

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 20°C (69°F), with highs reaching up to 34°C (93°F) and lows dropping to around 5°C (41°F).

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

September Precipitation in Gettysburg

In Gettysburg in September, the precipitation amount is 87 mm (3.4 in) over a span of 7 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 87 mm (3.4 inches) of precipitation spread over approximately 7 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

September Humidity in Gettysburg

In Gettysburg 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 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.

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.

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.
	Temperature	Precipitation	Humidity	UV
January Weather	-1°C (30°F)	72 mm (2.8 inches)	88%	moderate
February Weather	1°C (33°F)	97 mm (3.8 inches)	88%	moderate
March Weather	6°C (42°F)	112 mm (4.4 inches)	87%	high
April Weather	11°C (52°F)	100 mm (3.9 inches)	85%	very high
May Weather	17°C (64°F)	137 mm (5.4 inches)	81%	very high
June Weather	22°C (72°F)	127 mm (5.0 inches)	82%	very high
July Weather	24°C (76°F)	107 mm (4.2 inches)	81%	very high
August Weather	23°C (73°F)	99 mm (3.9 inches)	73%	very high
September Weather	20°C (69°F)	87 mm (3.4 inches)	73%	very high
October Weather	14°C (57°F)	98 mm (3.9 inches)	78%	high
November Weather	5°C (42°F)	94 mm (3.7 inches)	89%	moderate
December Weather	2°C (36°F)	84 mm (3.3 inches)	87%	moderate