September Weather in Tonasket, United States

Last updated: June 24, 2025

In September, the average temperature in Tonasket, United States hovers around 14°C (57°F), with temperatures ranging from a chilly 0°C (32°F) to a warm 32°C (89°F). Expect some drizzle, as precipitation is around 30 mm (1.2 in) spread over 5 days. With an average humidity of 74%, be prepared for a bit of stickiness in the air!

September Temperature in Tonasket

In September in Tonasket, the average temperature is 14°C (57°F). Maximum temperatures can reach 32°C (89°F), while minimums can drop as low as 0°C (32°F). This wide range makes Tonasket an ideal destination for travelers looking to experience diverse weather conditions.

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

The chart illustrates September temperature patterns in Tonasket, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Tonasket, September typically has an average temperature of 14°C (57°F), with highs reaching up to 32°C (89°F) and lows dropping to around 0°C (32°F).

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

September Precipitation in Tonasket

In Tonasket in September, the precipitation amount is 30 mm (1.2 in) over the course of 5 days.

September Precipitation Trends in Tonasket

The chart displays monthly precipitation patterns in Tonasket, 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 Tonasket, September typically receives around 30 mm (1.2 inches) of precipitation spread over approximately 5 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 Tonasket

In Tonasket in September, humidity is 74%. With an average temperature of 14°C (57°F), this humidity feels like a warm, damp blanket wrapping around you, making it slightly uncomfortable for traveling, as you may find yourself quickly sweating and in need of frequent breaks to cool down.

September Average Humidity in Tonasket

This chart illustrates the average monthly humidity levels in Tonasket, 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 Tonasket 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 Tonasket

In Tonasket 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 Tonasket.

Maximum UV Index Levels in Tonasket for September

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

Data source: Tonasket 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 Tonasket Compares to Other Months

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

This table compares monthly weather conditions in Tonasket, 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 (26°F)	78 mm (3.1 inches)	90%	low
February Weather	-4°C (25°F)	63 mm (2.5 inches)	91%	moderate
March Weather	2°C (36°F)	63 mm (2.5 inches)	89%	moderate
April Weather	6°C (44°F)	54 mm (2.1 inches)	85%	high
May Weather	12°C (54°F)	43 mm (1.7 inches)	82%	very high
June Weather	17°C (62°F)	24 mm (0.9 inches)	81%	very high
July Weather	21°C (70°F)	5 mm (0.2 inches)	84%	very high
August Weather	20°C (68°F)	9 mm (0.4 inches)	75%	very high
September Weather	14°C (57°F)	30 mm (1.2 inches)	74%	high
October Weather	6°C (43°F)	54 mm (2.1 inches)	85%	moderate
November Weather	1°C (34°F)	70 mm (2.8 inches)	88%	moderate
December Weather	-3°C (27°F)	77 mm (3.0 inches)	93%	low