September Weather in Scappoose, United States

Last updated: June 24, 2025

In September, the average temperature in Scappoose, United States is a pleasant 17°C (62°F), with daytime highs reaching up to 34°C (93°F) and nighttime lows dipping to 5°C (42°F). Visitors can expect 74 mm (2.9 in) of precipitation over approximately 8 days, accompanied by a comfortable average humidity level of 71%. Prepare for a mix of warm weather and occasional rain!

September Temperature in Scappoose

In September in Scappoose, the average temperature is 17°C (62°F). The maximum can reach 34°C (93°F), and the minimum can be as low as 5°C (42°F). This varied climate makes Scappoose an ideal destination for travelers looking to experience a range of activities, from enjoying warm days to cooler evenings.

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

The chart illustrates September temperature patterns in Scappoose, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Scappoose, September typically has an average temperature of 17°C (62°F), with highs reaching up to 34°C (93°F) and lows dropping to around 5°C (42°F).

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

September Precipitation in Scappoose

In Scappoose in September, the precipitation amount is 74 mm (2.9 in) over a period of 8 days.

September Precipitation Trends in Scappoose

The chart displays monthly precipitation patterns in Scappoose, 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 Scappoose, September typically receives around 74 mm (2.9 inches) of precipitation spread over approximately 8 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 Scappoose

In Scappoose in September, humidity is 71%. With an average temperature of 17°C (62°F), this humidity feels like a warm embrace that can leave you feeling a bit sticky, making outdoor exploration both refreshing and slightly uncomfortable.

September Average Humidity in Scappoose

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

In Scappoose 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 Scappoose.

Maximum UV Index Levels in Scappoose for September

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

Data source: Scappoose 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 Scappoose Compares to Other Months

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

This table compares monthly weather conditions in Scappoose, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	5°C (41°F)	176 mm (6.9 inches)	85%	low
February Weather	4°C (40°F)	163 mm (6.4 inches)	84%	moderate
March Weather	7°C (45°F)	140 mm (5.5 inches)	85%	moderate
April Weather	10°C (50°F)	119 mm (4.7 inches)	83%	high
May Weather	13°C (57°F)	64 mm (2.5 inches)	83%	very high
June Weather	16°C (62°F)	54 mm (2.1 inches)	83%	very high
July Weather	19°C (66°F)	8 mm (0.3 inches)	82%	very high
August Weather	20°C (68°F)	8 mm (0.3 inches)	74%	very high
September Weather	17°C (62°F)	74 mm (2.9 inches)	71%	high
October Weather	11°C (52°F)	107 mm (4.2 inches)	81%	moderate
November Weather	7°C (45°F)	166 mm (6.5 inches)	87%	moderate
December Weather	5°C (40°F)	186 mm (7.3 inches)	87%	low