September Weather in Yorktown, United States

Last updated: June 24, 2025

In September, the average temperature in Yorktown, United States hovers around 20°C (69°F), offering a pleasant climate for exploration. Expect temperatures to range from a cool 4°C (40°F) to a warm 33°C (91°F). Keep your umbrella handy, as 77 mm (3.0 in) of precipitation can be expected over 7 days, with an average humidity of 78% adding a touch of tropical feel to your experience. Enjoy the vibrant atmosphere that this month brings!

September Temperature in Yorktown

In September in Yorktown, the average temperature is 20°C (69°F). Maximum temperatures can reach 33°C (91°F), while minimum temperatures can drop as low as 4°C (40°F). This range of temperatures makes Yorktown a great destination for outdoor activities and versatile wardrobe choices during your travels.

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

The chart illustrates September temperature patterns in Yorktown, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Yorktown, September typically has an average temperature of 20°C (69°F), with highs reaching up to 33°C (91°F) and lows dropping to around 4°C (40°F).

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

September Precipitation in Yorktown

In Yorktown in September, the precipitation amount is 77 mm (3.0 in) over the course of 7 days.

September Precipitation Trends in Yorktown

The chart displays monthly precipitation patterns in Yorktown, 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 Yorktown, September typically receives around 77 mm (3.0 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 Yorktown

In Yorktown in September, humidity is 78%. With an average temperature of 20°C (69°F), this humidity feels like a warm, enveloping blanket, making travel somewhat uncomfortable as sweat clings to your skin and the air feels thick and heavy, urging you to seek out shaded areas and refreshing drinks.

September Average Humidity in Yorktown

This chart illustrates the average monthly humidity levels in Yorktown, 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 Yorktown is approximately 78%, 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 Yorktown

In Yorktown 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 Yorktown.

Maximum UV Index Levels in Yorktown for September

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

Data source: Yorktown 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 Yorktown Compares to Other Months

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

This table compares monthly weather conditions in Yorktown, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-2°C (30°F)	78 mm (3.1 inches)	85%	moderate
February Weather	0°C (33°F)	91 mm (3.6 inches)	85%	moderate
March Weather	5°C (42°F)	112 mm (4.4 inches)	86%	high
April Weather	11°C (51°F)	96 mm (3.8 inches)	87%	very high
May Weather	18°C (64°F)	133 mm (5.2 inches)	81%	very high
June Weather	23°C (73°F)	111 mm (4.4 inches)	82%	extreme
July Weather	24°C (76°F)	108 mm (4.2 inches)	81%	very high
August Weather	23°C (74°F)	94 mm (3.7 inches)	79%	very high
September Weather	20°C (69°F)	77 mm (3.0 inches)	78%	very high
October Weather	14°C (57°F)	102 mm (4.0 inches)	81%	high
November Weather	5°C (42°F)	85 mm (3.3 inches)	89%	moderate
December Weather	2°C (36°F)	71 mm (2.8 inches)	86%	low