September Weather in Williamsburg, United States

Last updated: June 24, 2025

In Williamsburg, United States, the average temperature in September is a mild 16°C (61°F). However, temperatures can vary significantly, with a minimum of -3°C (26°F) and a maximum soaring up to 32°C (90°F). Expect around 39 mm (1.5 in) of precipitation spread over about 7 days, and enjoy the comfortable climate with an average humidity of 65%.

September Temperature in Williamsburg

In September in Williamsburg, the average temperature is 16°C (61°F). Maximum temperatures can reach 32°C (90°F), while minimums can drop as low as -3°C (26°F). Be sure to pack for a range of weather conditions when traveling during this time.

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

The chart illustrates September temperature patterns in Williamsburg, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Williamsburg, September typically has an average temperature of 16°C (61°F), with highs reaching up to 32°C (90°F) and lows dropping to around -3°C (26°F).

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

September Precipitation in Williamsburg

In Williamsburg in September, the precipitation amount is 39 mm (1.5 in) over the course of 7 days.

September Precipitation Trends in Williamsburg

The chart displays monthly precipitation patterns in Williamsburg, 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 Williamsburg, September typically receives around 39 mm (1.5 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 Williamsburg

In Williamsburg in September, humidity is 65%. With an average temperature of 16°C (61°F), this humidity feels like a gentle warmth enveloping you, making it ideal for exploring the sights without overwhelming discomfort.

September Average Humidity in Williamsburg

This chart illustrates the average monthly humidity levels in Williamsburg, 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 Williamsburg is approximately 65%, 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 Williamsburg

In Williamsburg in September, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in Williamsburg.

Maximum UV Index Levels in Williamsburg for September

The chart shows the monthly maximum UV Index (UVI) for Williamsburg 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 Williamsburg typically reaches 10, which falls under the very high exposure category.

Data source: Williamsburg 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 Williamsburg Compares to Other Months

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

This table compares monthly weather conditions in Williamsburg, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-4°C (25°F)	17 mm (0.7 inches)	88%	moderate
February Weather	-4°C (25°F)	23 mm (0.9 inches)	87%	high
March Weather	2°C (35°F)	37 mm (1.5 inches)	81%	very high
April Weather	6°C (43°F)	42 mm (1.7 inches)	76%	extreme
May Weather	11°C (52°F)	74 mm (2.9 inches)	66%	extreme
June Weather	18°C (64°F)	44 mm (1.7 inches)	58%	extreme
July Weather	20°C (68°F)	79 mm (3.1 inches)	52%	extreme
August Weather	19°C (66°F)	61 mm (2.4 inches)	56%	extreme
September Weather	16°C (61°F)	39 mm (1.5 inches)	65%	very high
October Weather	7°C (46°F)	28 mm (1.1 inches)	76%	high
November Weather	2°C (36°F)	17 mm (0.7 inches)	82%	moderate
December Weather	-2°C (28°F)	13 mm (0.5 inches)	89%	moderate