September Weather in Siletz, United States

Last updated: June 24, 2025

In September, the average temperature in Siletz, United States hovers around 14°C (58°F). Expect temperatures to dip to a minimum of 9°C (48°F) and reach up to a maximum of 25°C (77°F). During this month, you can anticipate precipitation of approximately 71 mm (2.8 in) spread over 9 days. The average humidity sits at a comfortable 71%, making for a pleasantly mild atmosphere.

September Temperature in Siletz

In September in Siletz, the average temperature is 14°C (58°F). Maximum can reach 25°C (77°F) and minimum can be as low as 9°C (48°F). It’s an ideal time for travelers to enjoy mild weather while exploring the attractions of Siletz.

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

The chart illustrates September temperature patterns in Siletz, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Siletz, September typically has an average temperature of 14°C (58°F), with highs reaching up to 25°C (77°F) and lows dropping to around 9°C (48°F).

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

September Precipitation in Siletz

In Siletz in September, the precipitation amount is 71 mm (2.8 in) spread over 9 days.

September Precipitation Trends in Siletz

The chart displays monthly precipitation patterns in Siletz, 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 Siletz, September typically receives around 71 mm (2.8 inches) of precipitation spread over approximately 9 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 Siletz

In Siletz in September humidity is 71%. With an average temperature of 14°C (58°F), this humidity feels like a damp embrace, making it essential for travelers to pack light, breathable clothing and stay hydrated while exploring the sights.

September Average Humidity in Siletz

This chart illustrates the average monthly humidity levels in Siletz, 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 Siletz is approximately 71%, 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 Siletz

In Siletz 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 Siletz.

Maximum UV Index Levels in Siletz for September

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

Data source: Siletz 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 Siletz Compares to Other Months

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

This table compares monthly weather conditions in Siletz, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	8°C (46°F)	271 mm (10.7 inches)	85%	low
February Weather	7°C (44°F)	248 mm (9.8 inches)	84%	moderate
March Weather	8°C (46°F)	191 mm (7.5 inches)	85%	high
April Weather	9°C (49°F)	158 mm (6.2 inches)	83%	high
May Weather	11°C (52°F)	74 mm (2.9 inches)	83%	very high
June Weather	13°C (56°F)	62 mm (2.4 inches)	83%	very high
July Weather	15°C (58°F)	9 mm (0.4 inches)	82%	very high
August Weather	15°C (59°F)	13 mm (0.5 inches)	74%	very high
September Weather	14°C (58°F)	71 mm (2.8 inches)	71%	high
October Weather	12°C (54°F)	151 mm (5.9 inches)	81%	moderate
November Weather	10°C (50°F)	254 mm (10.0 inches)	87%	moderate
December Weather	8°C (46°F)	292 mm (11.5 inches)	87%	low