September Weather in Wenatchee, United States

Last updated: June 24, 2025

In September, the average temperature in Wenatchee, United States hovers around 15°C (60°F), with a potential minimum of 1°C (35°F) and a sweltering maximum of 35°C (95°F). Expect approximately 26 mm (1.0 in) of precipitation spread over 4 days, and enjoy an average humidity of 62%. Make sure to prepare for a mix of conditions!

September Temperature in Wenatchee

In September in Wenatchee, the average temperature is 15°C (60°F). Maximums can reach 35°C (95°F) and minimums can be as low as 1°C (35°F). Be prepared for a wide range of temperatures during your travels, so pack accordingly!

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

The chart illustrates September temperature patterns in Wenatchee, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Wenatchee, September typically has an average temperature of 15°C (60°F), with highs reaching up to 35°C (95°F) and lows dropping to around 1°C (35°F).

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

September Precipitation in Wenatchee

In Wenatchee in September, the precipitation amount is 26 mm (1.0 in) over the course of 4 days.

September Precipitation Trends in Wenatchee

The chart displays monthly precipitation patterns in Wenatchee, 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 Wenatchee, September typically receives around 26 mm (1.0 inches) of precipitation spread over approximately 4 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 Wenatchee

In Wenatchee in September, humidity is 62%. With an average temperature of 15°C (60°F), this humidity feels like a warm embrace, making it a bit muggy for traveling, yet pleasantly refreshing for leisurely strolls and outdoor exploration.

September Average Humidity in Wenatchee

This chart illustrates the average monthly humidity levels in Wenatchee, 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 Wenatchee is approximately 62%, 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 Wenatchee

In Wenatchee in September, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in Wenatchee.

Maximum UV Index Levels in Wenatchee for September

The chart shows the monthly maximum UV Index (UVI) for Wenatchee 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 Wenatchee typically reaches 7, which falls under the high exposure category.

Data source: Wenatchee 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 Wenatchee Compares to Other Months

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

This table compares monthly weather conditions in Wenatchee, 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 (28°F)	84 mm (3.3 inches)	86%	low
February Weather	-2°C (29°F)	76 mm (3.0 inches)	86%	moderate
March Weather	3°C (38°F)	46 mm (1.8 inches)	87%	high
April Weather	8°C (46°F)	41 mm (1.6 inches)	84%	high
May Weather	13°C (56°F)	26 mm (1.0 inches)	81%	very high
June Weather	17°C (63°F)	14 mm (0.5 inches)	82%	very high
July Weather	21°C (70°F)	3 mm (0.1 inches)	79%	very high
August Weather	21°C (70°F)	5 mm (0.2 inches)	63%	very high
September Weather	15°C (60°F)	26 mm (1.0 inches)	62%	high
October Weather	8°C (46°F)	56 mm (2.2 inches)	83%	moderate
November Weather	2°C (37°F)	64 mm (2.5 inches)	89%	moderate
December Weather	-1°C (30°F)	79 mm (3.1 inches)	88%	low