September Weather in Colville, United States

Last updated: June 24, 2025

In Colville, United States, the average temperature in September hovers around 15°C (60°F). Expect a minimum of 1°C (33°F) and the possibility of basking in the warmth with highs reaching 34°C (93°F). During this month, precipitation averages 39 mm (1.5 in) over about 6 days, and the air boasts an average humidity level of 74%. Prepare for a mix of warm and wet days!

September Temperature in Colville

In September in Colville, the average temperature is 15°C (60°F). The maximum can reach 34°C (93°F) and the minimum can be as low as 1°C (33°F). Be prepared for a wide range of temperatures, making it essential to pack layers for your trip.

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

The chart illustrates September temperature patterns in Colville, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Colville, September typically has an average temperature of 15°C (60°F), with highs reaching up to 34°C (93°F) and lows dropping to around 1°C (33°F).

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

September Precipitation in Colville

In Colville in September, the precipitation amount is 39 mm (1.5 in), occurring over the course of 6 days.

September Precipitation Trends in Colville

The chart displays monthly precipitation patterns in Colville, 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 Colville, September typically receives around 39 mm (1.5 inches) of precipitation spread over approximately 6 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 Colville

In Colville in September humidity is 74%. With an average temperature of 15°C (60°F), this humidity feels like a warm embrace that can make outdoor activities feel slightly stifling, so travelers should be prepared to hydrate frequently and take breaks in the shade.

September Average Humidity in Colville

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

In Colville 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 Colville.

Maximum UV Index Levels in Colville for September

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

Data source: Colville 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 Colville Compares to Other Months

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

This table compares monthly weather conditions in Colville, 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)	73 mm (2.9 inches)	90%	low
February Weather	-3°C (26°F)	56 mm (2.2 inches)	91%	moderate
March Weather	2°C (36°F)	58 mm (2.3 inches)	89%	moderate
April Weather	7°C (45°F)	63 mm (2.5 inches)	85%	high
May Weather	13°C (56°F)	58 mm (2.3 inches)	82%	very high
June Weather	18°C (64°F)	37 mm (1.5 inches)	81%	very high
July Weather	22°C (73°F)	12 mm (0.5 inches)	84%	very high
August Weather	22°C (71°F)	23 mm (0.9 inches)	75%	very high
September Weather	15°C (60°F)	39 mm (1.5 inches)	74%	high
October Weather	7°C (45°F)	51 mm (2.0 inches)	85%	moderate
November Weather	2°C (35°F)	60 mm (2.4 inches)	88%	moderate
December Weather	-2°C (29°F)	67 mm (2.6 inches)	93%	low