September Weather in Okanogan, United States

Last updated: June 24, 2025

In September, the average temperature in Okanogan, United States hovers around 16°C (61°F). Expect a minimum of 3°C (38°F) and a maximum of 34°C (94°F), making for quite the range! With 21 mm (0.8 in) of precipitation spread over 4 days, the weather can be unpredictable. Don’t forget, the average humidity sits at a comfortable 74%. Enjoy the variety!

September Temperature in Okanogan

In September in Okanogan, the average temperature is 16°C (61°F), with maximums reaching 34°C (94°F) and minimums dropping as low as 3°C (38°F). This diverse temperature range makes it advisable for travelers to pack both lightweight clothing and warmer layers to ensure comfort during their visit.

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

The chart illustrates September temperature patterns in Okanogan, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Okanogan, September typically has an average temperature of 16°C (61°F), with highs reaching up to 34°C (94°F) and lows dropping to around 3°C (38°F).

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

September Precipitation in Okanogan

In Okanogan in September, the precipitation amount is 21 mm (0.8 in) over a span of 4 days.

September Precipitation Trends in Okanogan

The chart displays monthly precipitation patterns in Okanogan, 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 Okanogan, September typically receives around 21 mm (0.8 inches) of precipitation spread over approximately 4 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 Okanogan

In Okanogan in September humidity is 74%. With an average temperature of 16°C (61°F), this humidity feels like a damp blanket wrapping around you, making traveling quite uncomfortable as the air feels thick and muggy, potentially leading to fatigue and a longing for a cool breeze.

September Average Humidity in Okanogan

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

In Okanogan 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 Okanogan.

Maximum UV Index Levels in Okanogan for September

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

Data source: Okanogan 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 Okanogan Compares to Other Months

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

This table compares monthly weather conditions in Okanogan, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-3°C (27°F)	72 mm (2.8 inches)	90%	low
February Weather	-2°C (28°F)	48 mm (1.9 inches)	91%	moderate
March Weather	4°C (39°F)	45 mm (1.8 inches)	89%	moderate
April Weather	9°C (48°F)	34 mm (1.3 inches)	85%	high
May Weather	15°C (59°F)	33 mm (1.3 inches)	82%	very high
June Weather	19°C (67°F)	12 mm (0.5 inches)	81%	very high
July Weather	23°C (74°F)	2 mm (0.1 inches)	84%	very high
August Weather	22°C (72°F)	5 mm (0.2 inches)	75%	very high
September Weather	16°C (61°F)	21 mm (0.8 inches)	74%	high
October Weather	8°C (46°F)	39 mm (1.5 inches)	85%	moderate
November Weather	2°C (36°F)	54 mm (2.1 inches)	88%	moderate
December Weather	-2°C (28°F)	63 mm (2.5 inches)	93%	low