September Weather in Yorktown, United States

Last updated: June 24, 2025

In September, the average temperature in Yorktown, United States hovers around 28°C (82°F). While you can expect a refreshing minimum of 12°C (54°F), be prepared for days that can sizzle up to a scorching 38°C (101°F). With an average precipitation of 109 mm (4.3 in) spread over 13 days, and humidity levels at around 65%, this month offers a mix of warmth and occasional rain.

September Temperature in Yorktown

In September in Yorktown, the average temperature is 28°C (82°F). Maximum temperatures can reach 38°C (101°F), while minimums can drop to as low as 12°C (54°F). Pack accordingly and enjoy the warm weather, but be prepared for cooler evenings as well!

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 28°C (82°F), with highs reaching up to 38°C (101°F) and lows dropping to around 12°C (54°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 109 mm (4.3 in), which occurs during 13 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 109 mm (4.3 inches) of precipitation spread over approximately 13 days.

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

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Millimeters (mm) Inches (in)

September Humidity in Yorktown

In Yorktown in September, humidity is 65%. With an average temperature of 28°C (82°F), this humidity feels like a warm, sticky embrace that can make outdoor activities feel a bit more exhausting, so staying hydrated and taking breaks in the shade is essential for a comfortable travel experience.

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 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 Yorktown

In Yorktown in September, the maximum UV index reaches 11, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's essential to take precautions. For more details, you can check 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 11, which falls under the extreme 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	13°C (55°F)	43 mm (1.7 inches)	79%	moderate
February Weather	14°C (58°F)	52 mm (2.0 inches)	79%	very high
March Weather	19°C (67°F)	55 mm (2.2 inches)	74%	very high
April Weather	22°C (72°F)	70 mm (2.8 inches)	76%	extreme
May Weather	26°C (79°F)	110 mm (4.3 inches)	81%	extreme
June Weather	28°C (84°F)	100 mm (4.0 inches)	76%	extreme
July Weather	30°C (85°F)	81 mm (3.2 inches)	66%	extreme
August Weather	30°C (86°F)	71 mm (2.8 inches)	58%	extreme
September Weather	28°C (82°F)	109 mm (4.3 inches)	65%	extreme
October Weather	23°C (74°F)	64 mm (2.5 inches)	74%	very high
November Weather	17°C (64°F)	59 mm (2.3 inches)	81%	high
December Weather	15°C (59°F)	59 mm (2.3 inches)	86%	moderate