September Weather in Fredericksburg, United States

Last updated: June 24, 2025

In September, the average temperature in Fredericksburg, United States is a comfortable 18°C (65°F). Expect a minimum of 2°C (36°F) and a maximum of 33°C (91°F), providing a diverse range for any activity. However, be prepared for some rain, as precipitation averages 126 mm (4.9 in) over 11 days. With an average humidity of 74%, the air tends to feel quite moist, adding to the overall climate experience.

September Temperature in Fredericksburg

In September in Fredericksburg, the average temperature is 18°C (65°F), with maximums reaching 33°C (91°F) and minimums dropping as low as 2°C (36°F). This makes Fredericksburg an ideal destination for travelers seeking a mix of comfortable days and cooler evenings.

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

The chart illustrates September temperature patterns in Fredericksburg, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Fredericksburg, September typically has an average temperature of 18°C (65°F), with highs reaching up to 33°C (91°F) and lows dropping to around 2°C (36°F).

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

September Precipitation in Fredericksburg

In Fredericksburg in September, the precipitation amount is 126 mm (4.9 in) over the course of 11 days.

September Precipitation Trends in Fredericksburg

The chart displays monthly precipitation patterns in Fredericksburg, 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 Fredericksburg, September typically receives around 126 mm (4.9 inches) of precipitation spread over approximately 11 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 Fredericksburg

In Fredericksburg in September humidity is 74%. With an average temperature of 18°C (65°F), this humidity feels like a warm, sticky embrace that can make even short walks feel laborious, leading travelers to seek shade and refreshment more often.

September Average Humidity in Fredericksburg

This chart illustrates the average monthly humidity levels in Fredericksburg, 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 Fredericksburg is approximately 74%, 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 Fredericksburg

In Fredericksburg 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 Fredericksburg.

Maximum UV Index Levels in Fredericksburg for September

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

Data source: Fredericksburg 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 Fredericksburg Compares to Other Months

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

This table compares monthly weather conditions in Fredericksburg, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-7°C (19°F)	38 mm (1.5 inches)	84%	moderate
February Weather	-7°C (19°F)	52 mm (2.0 inches)	85%	moderate
March Weather	2°C (35°F)	70 mm (2.8 inches)	84%	moderate
April Weather	8°C (46°F)	72 mm (2.8 inches)	83%	very high
May Weather	15°C (60°F)	169 mm (6.7 inches)	75%	very high
June Weather	22°C (72°F)	131 mm (5.2 inches)	79%	extreme
July Weather	23°C (74°F)	94 mm (3.7 inches)	75%	very high
August Weather	21°C (71°F)	119 mm (4.7 inches)	69%	very high
September Weather	18°C (65°F)	126 mm (4.9 inches)	74%	very high
October Weather	10°C (50°F)	135 mm (5.3 inches)	79%	moderate
November Weather	2°C (35°F)	51 mm (2.0 inches)	88%	moderate
December Weather	-2°C (28°F)	37 mm (1.5 inches)	82%	moderate